Vegitable Harvest

Harvesting

Harvesting beetroot in the United Kingdom

When a vegetable is harvested, it is cut off from its source of water and nourishment. It continues to transpire and loses moisture as it does so, a process most noticeable in the wilting of green leafy crops. Harvesting root vegetables when they are fully mature improves their storage life, but alternatively, these root crops can be left in the ground and harvested over an extended period. The harvesting process should seek to minimise damage and bruising to the crop. Onions and garlic can be dried for a few days in the field and root crops such as potatoes benefit from a short maturation period in warm moist surroundings during which time wounds heal and the skin thickens up and hardens. Before marketing or storage, grading needs to be done to remove damaged goods and select produce according to its quality, size, ripeness and color.^[34]

Storage

All vegetables benefit from proper post harvest care. A large proportion of vegetables and perishable foods are lost after harvest during the storage period. These losses may be as high as thirty to fifty percent in developing countries where adequate cold storage facilities are not available. The main causes of loss include spoilage caused by moisture, moulds, micro-organisms and vermin.^[35]

Temporary storage of potatoes in the Netherlands

Storage can be short-term or long-term. Most vegetables are perishable and short-term storage for a few days provides flexibility in marketing. During storage, leafy vegetables lose moisture, and the vitamin C in them degrades rapidly. A few products such as potatoes and onions have better keeping qualities and can be sold when higher prices may be available, and by extending the marketing season, a greater total volume of crop can be sold. If refrigerated storage is not available, the priority for most crops is to store high-quality produce, to maintain a high humidity level and to keep the produce in the shade.^[34]
Proper post-harvest storage aimed at extending and ensuring shelf life is best effected by efficient cold chain application.^[36] Cold storage is particularly useful for vegetables such as cauliflower, eggplant, lettuce, radish, spinach, potatoes and tomatoes, the optimum temperature depending on the type of produce. There are temperature-controlling technologies that do not require the use of electricity such as evaporative cooling.^[6] Storage of fruit and vegetables in controlled atmospheres with high levels of carbon dioxide or high oxygen levels can inhibit microbial growth and extend storage life.^[37]
The irradiation of vegetables and other agricultural produce by ionizing radiation can be used to preserve it from both microbial infection and insect damage, as well as from physical deterioration. It can extend the storage life of food without noticeably changing its properties.^[38]

Preservation

The objective of preserving vegetables is to extend their availability for consumption or marketing purposes. The aim is to harvest the food at its maximum state of palatability and nutritional value, and preserve these qualities for an extended period. The main causes of deterioration in vegetables after they are gathered are the actions of naturally-occurring enzymes and the spoilage caused by micro-organisms.^[39] Canning and freezing are the most commonly used techniques, and vegetables preserved by these methods are generally similar in nutritional value to comparable fresh products with regards to carotenoids, vitamin E, minerals and dietary fiber.^[40]

Bean field and canning factory, New Jersey, US

Canning is a process during which the enzymes in vegetables are deactivated and the micro-organisms present killed by heat. The sealed can excludes air from the foodstuff to prevent subsequent deterioration. The lowest necessary heat and the minimum processing time are used in order to prevent the mechanical breakdown of the product and to preserve the flavor as far as is possible. The can is then able to be stored at ambient temperatures for a long period.^[39]
Freezing vegetables and maintaining their temperature at below −10 °C (14 °F) will prevent their spoilage for a short period, whereas a temperature of −18 °C (0 °F) is required for longer-term storage. The enzyme action will merely be inhibited, and blanching of suitably sized prepared vegetables before freezing mitigates this and prevents off-flavors developing. Not all micro-organisms will be killed at these temperatures and after thawing the vegetables should be used promptly because otherwise, any microbes present may proliferate.^[41]

Sun-drying tomatoes in Greece

Traditionally, sun drying has been used for some products such as tomatoes, mushrooms and beans, spreading the produce on racks and turning the crop at intervals. This method suffers from several disadvantages including lack of control over drying rates, spoilage when drying is slow, contamination by dirt, wetting by rain and attack by rodents, birds and insects. These disadvantages can be alleviated by using solar powered driers.^[35] The dried produce must be prevented from reabsorbing moisture during storage.^[39]
High levels of both sugar and salt can preserve food by preventing micro-organisms from growing. Green beans can be salted by layering the pods with salt, but this method of preservation is unsuited to most vegetables. Marrows, beetroot, carrot and some other vegetables can be boiled with sugar to create jams.^[39] Vinegar is widely used in food preservation; a sufficient concentration of acetic acid prevents the development of destructive micro-organisms, a fact made use of in the preparation of pickles, chutneys and relishes.^[39] Fermentation is another method of preserving vegetables for later use. Sauerkraut is made from chopped cabbage and relies on lactic acid bacteria which produce compounds that are inhibitory to the growth of other micro-organisms.^[6]

Top producers

Farmers' market showing vegetables for sale near the Potala Palace in Lhasa, Tibet

Vegetable shop in India

Vegetables in a supermarket in the United States

Vegetables in a supermarket in Canada

In 2010, China was the largest vegetable producing nation, with over half the world's production. India, the United States, Turkey, Iran and Egypt were the next largest producers. China had the highest area of land devoted to vegetable production, while the highest average yields were obtained in Spain and the Republic of Korea.^[42]

Country	Area cultivated thousand hectares (2,500 acres)	Yield thousand kg/ha (89 lbs/acre)	Production thousand tonnes (1,100 short tons)
China	23,458	230	539,993
India	7,256	138	100,045
United States	1,120	318	35,609
Turkey	1,090	238	25,901
Iran	767	261	19,995
Egypt	755	251	19,487
Italy	537	265	14,201
Russia	759	175	13,283
Spain	348	364	12,679
Mexico	681	184	12,515
Nigeria	1844	64	11,830
Brazil	500	225	11,233
Japan	407	264	10,746
Indonesia	1082	90	9,780
South Korea	268	364	9,757
Vietnam	818	110	8,976
Ukraine	551	162	8,911
Uzbekistan	220	342	7,529
Philippines	718	88	6,299
France	245	227	5,572
Total world	55,598	188	1,044,380

Standards

The International Organization for Standardization (ISO) sets international standards to ensure that products and services are safe, reliable and of good quality. There are a number of ISO standards regarding fruits and vegetables.^[43] ISO 1991-1:1982 lists the botanical names of sixty-one species of plants used as vegetables along with the common names of the vegetables in English, French and Russian.^[44] ISO 67.080.20 covers the storage and transport of vegetables and their derived products.^[45]

Healthy Vegitables

                                              

Vegetable

"Veggie" redirects here. For the diet which only contains plants, see Veganism. For other uses, see Vegetable (disambiguation).

Vegetables in a market in the Philippines

In everyday usage, a vegetable is any part of a plant that is consumed by humans as food as part of a savory meal. The term vegetable is somewhat arbitrary, and largely defined through culinary and cultural tradition. It normally excludes other food derived from plants such as fruits, nuts, and cereal  grains, but includes seeds such as pulses. The original meaning of the word vegetable, still used in biology, was to describe all types of plant, as in the terms "vegetable kingdom" and "vegetable matter".
Originally, vegetables were collected from the wild by hunter-gatherers and entered cultivation in several parts of the world, probably during the period 10,000 BC to 7,000 BC, when a new agricultural way of life developed. At first, plants which grew locally would have been cultivated, but as time went on, trade brought exotic crops from elsewhere to add to domestic types. Nowadays, most vegetables are grown all over the world as climate permits, and crops may be cultivated in protected environments in less suitable locations. China is the largest producer of vegetables, and global trade in agricultural products allows consumers to purchase vegetables grown in faraway countries. The scale of production varies from subsistence farmer supplying the needs of their family for food, to agribusinesses with vast acreages of single-product crops. Depending on the type of vegetable concerned, harvesting the crop is followed by grading, storing, processing and marketing.
Vegetables can be eaten either raw or cooked and play an important role in human nutrition, being mostly low in fat and carbohydrates, but high in vitamins, minerals and fiber. Many nutritionists encourage people to consume plenty of fruit and vegetables, five or more portions a day often being recommended.

 

Etymology

Domestic vegetable garden in the United Kingdom

The word vegetable was first recorded in English in the early 15th century. It comes from Old French,^[1] and was originally applied to all plants; the word is still used in this sense in biological contexts.^[2] It derives from Medieval Latin vegetabilis "growing, flourishing" (i.e. of a plant), a semantic change from a Late Latin meaning "to be enlivening, quickening".^[1]
The meaning of "vegetable" as a "plant grown for food" was not established until the 18th century.^[3] In 1767, the word was specifically used to mean a "plant cultivated for food, an edible herb or root". The year 1955 noted the first use of the shortened, slang term "veggie".^[4]
As an adjective, the word vegetable is used in scientific and technical contexts with a different and much broader meaning, namely of "related to plants" in general, edible or not — as in vegetable matter, vegetable kingdom, vegetable origin, etc.^[2]

Some common vegetables

Some common vegetables
Image	Description	Parts used	Origin	Cultivars	World production (×106 tons, 2012)[17]
	cabbage Brassica oleracea	leaves, axillary buds, stems, flowerheads	Europe	cabbage, red cabbage, Savoy cabbage, kale, Brussels sprouts, kohlrabi, cauliflower, broccoli, Chinese broccoli	70.1
	turnip Brassica rapa	tubers, leaves	Asia	turnip, rutabaga, Chinese cabbage, napa cabbage, bok choy, collard greens
	radish Raphanus sativus	roots, leaves, seed pods, seed oil, sprouting	Southeastern Asia	radish, daikon, seedpod varieties
	carrot Daucus carota	root tubers	Persia	carrot	36.9[n 1]
	parsnip Pastinaca sativa	Root tubers	Eurasia	parsnip
	beetroot Beta vulgaris	tubers, leaves	Europe, Near East and India	beetroot, sea beet, Swiss chard, sugar beet
	lettuce Lactuca sativa	leaves, stems, seed oil	Egypt	lettuce, celtuce	24.9
	beans Phaseolus vulgaris Phaseolus coccineus Phaseolus lunatus	pods, seeds	Central and South America	green bean, French bean, runner bean, haricot bean, Lima bean	44.6[n 2]
	broad beans Vicia faba	pods, seeds	North Africa South and southwest Asia	broad bean
	peas Pisum sativum	pods, seeds, sprouting	Mediterranean and Middle East	pea, snap pea, snow pea, split pea	28.9[n 2]
	potato Solanum tuberosum	root tubers	South America	potato	365.4
	aubergine/eggplant Solanum melongena	fruits	South and East Asia	eggplant (aubergine)	48.4
	tomato Solanum lycopersicum	fruits	South America	tomato, see also list of tomato cultivars	161.8
	cucumber Cucumis sativus	fruits	Southern Asia	cucumber, see also list of cucumber varieties	65.1
	pumpkin/squash Cucurbita spp.	fruits, flowers	Mesoamerica	pumpkin, squash, marrow, zucchini (courgette), gourd	24.6
	onion Allium cepa	bulbs, leaves	Asia	onion, spring onion, scallion, shallot, see also list of onion cultivars	87.2[n 2]
	garlic Allium sativum	bulbs	Asia	garlic	24.8
	leek Allium ampeloprasum	leaf sheaths	Europe and Middle East	leek, elephant garlic	21.7
	pepper Capsicum annuum	fruits	North and South America	pepper, bell pepper, sweet pepper	34.5[n 2]
	spinach Spinacia oleracea	leaves	Central and southwestern Asia	spinach	21.7
	yam Dioscorea spp.	tubers	Tropical Africa	yam	59.5
	sweet potato Ipomoea batatas	tubers, leaves, shoots	Central and South America	sweet potato, see also list of sweet potato cultivars	108.0
	cassava Manihot esculenta	tubers	South America	cassava	269.1

Nutrition and health

Southeast Asian style stir fry ipomoea aquatica in chili and sambal

Vegetables (and some fruit) for sale on a street in Guntur, India

Vegetables play an important role in human nutrition. Most are low in fat and calories but are bulky and filling.^[18] They supply dietary fibre and are important sources of essential vitamins, minerals and trace elements. Particularly important are the antioxidant vitamins A, C and E. When vegetables are included in the diet, there is found to be a reduction in the incidence of cancer, stroke, cardiovascular disease and other chronic ailments.^[19][20] Research has shown that, compared with individuals who eat less than three servings of fruits and vegetables each day, those that eat more than five servings have an approximately twenty percent lower risk of developing coronary heart disease or stroke.^[21] The nutritional content of vegetables varies considerably; some contain useful amounts of protein though generally they contain little fat,^[22] and varying proportions of vitamins such as vitamin A, vitamin K and vitamin B₆, provitamins, dietary minerals and carbohydrates. Vegetables contain a great variety of other phytochemicals (bioactive non-nutrient plant compounds), some of which have been claimed to have antioxidant, antibacterial, antifungal, antiviral and anticarcinogenic properties.^[23][24]
However, vegetables often also contain toxins and antinutrients which interfere with the absorption of nutrients. These include α-solanine, α-chaconine,^[25] enzyme inhibitors (of cholinesterase, protease, amylase, etc.), cyanide and cyanide precursors, oxalic acid and others.^{[citation needed]} These toxins are natural defenses, used to ward off the insects, predators and fungi that might attack the plant. Some beans contain phytohaemagglutinin, and cassava roots contain cyanogenic glycoside as do bamboo shoots. These toxins can be deactivated by adequate cooking. Green potatoes contain glycoalkaloids and should be avoided.^[26]
Fruit and vegetables, particularly leafy vegetables, have been implicated in nearly half the gastrointestinal infections caused by norovirus in the United States. These foods are commonly eaten raw and may become contaminated during their preparation by an infected food handler. Hygiene is important when handling foods to be eaten raw, and such products need to be properly cleaned, handled and stored to limit contamination.^[27]

Dietary recommendations

The USDA Dietary Guidelines for Americans recommends consuming five to nine servings of fruit and vegetables daily.^[28] The total amount consumed will vary according to age and gender, and is determined based upon the standard portion sizes typically consumed, as well as general nutritional content. Potatoes are not included in the count as they are mainly providers of starch. For most vegetables and vegetable juices, one serving is half of a cup and can be eaten raw or cooked. For leafy greens, such as lettuce and spinach, a single serving is typically a full cup.^[29] A variety of products should be chosen as no single fruit or vegetable provides all the nutrients needed for health.^[21]
International dietary guidelines are similar to the ones established by the USDA. Japan, for example, recommends the consumption of five to six servings of vegetables daily.^[30] French recommendations provide similar guidelines and set the daily goal at five servings.^[31] In India, the daily recommendation for adults is 275 grams (9.7 oz) of vegetables per day.^[19]

Cultivation

Further information: Kitchen garden and Vegetable farming

Growing vegetables in South Africa

Vegetables have been part of the human diet from time immemorial. Some are staple foods but most are accessory foodstuffs, adding variety to meals with their unique flavors and at the same time, adding nutrients necessary for health. Some vegetables are perennials but most are annuals and biennials, usually harvested within a year of sowing or planting. Whatever system is used for growing crops, cultivation follows a similar pattern; preparation of the soil by loosening it, removing or burying weeds and adding organic manures or fertilisers; sowing seeds or planting young plants; tending the crop while it grows to reduce weed competition, control pests and provide sufficient water; harvesting the crop when it is ready; sorting, storing and marketing the crop or eating it fresh from the ground.^[32]
Different soil types suit different crops, but in general in temperate climates, sandy soils dry out fast but warm up quickly in the spring and are suitable for early crops, while heavy clays retain moisture better and are more suitable for late season crops. The growing season can be lengthened by the use of fleece, cloches, plastic mulch, polytunnels and greenhouses.^[32] In hotter regions, the production of vegetables is constrained by the climate, especially the pattern of rainfall, while in temperate zones, it is constrained by the temperature and day length.^[33]

Weeding cabbages in Colorado, US

On a domestic scale, the spade, fork and hoe are the tools of choice while on commercial farms a range of mechanical equipment is available. Besides tractors, these include ploughs, harrows, drills, transplanters, cultivators, irrigation equipment and harvesters. New techniques are changing the cultivation procedures involved in growing vegetables with computer monitoring systems, GPS locators and self-steer programmes for driverless machines giving economic benefits.^[33]

Healthy Vegitables

                                              

Vegetable

"Veggie" redirects here. For the diet which only contains plants, see Veganism. For other uses, see Vegetable (disambiguation).

Vegetables in a market in the Philippines

In everyday usage, a vegetable is any part of a plant that is consumed by humans as food as part of a savory meal. The term vegetable is somewhat arbitrary, and largely defined through culinary and cultural tradition. It normally excludes other food derived from plants such as fruits, nuts, and cereal  grains, but includes seeds such as pulses. The original meaning of the word vegetable, still used in biology, was to describe all types of plant, as in the terms "vegetable kingdom" and "vegetable matter".
Originally, vegetables were collected from the wild by hunter-gatherers and entered cultivation in several parts of the world, probably during the period 10,000 BC to 7,000 BC, when a new agricultural way of life developed. At first, plants which grew locally would have been cultivated, but as time went on, trade brought exotic crops from elsewhere to add to domestic types. Nowadays, most vegetables are grown all over the world as climate permits, and crops may be cultivated in protected environments in less suitable locations. China is the largest producer of vegetables, and global trade in agricultural products allows consumers to purchase vegetables grown in faraway countries. The scale of production varies from subsistence farmer supplying the needs of their family for food, to agribusinesses with vast acreages of single-product crops. Depending on the type of vegetable concerned, harvesting the crop is followed by grading, storing, processing and marketing.
Vegetables can be eaten either raw or cooked and play an important role in human nutrition, being mostly low in fat and carbohydrates, but high in vitamins, minerals and fiber. Many nutritionists encourage people to consume plenty of fruit and vegetables, five or more portions a day often being recommended.

 

Etymology

Domestic vegetable garden in the United Kingdom

The word vegetable was first recorded in English in the early 15th century. It comes from Old French,^[1] and was originally applied to all plants; the word is still used in this sense in biological contexts.^[2] It derives from Medieval Latin vegetabilis "growing, flourishing" (i.e. of a plant), a semantic change from a Late Latin meaning "to be enlivening, quickening".^[1]
The meaning of "vegetable" as a "plant grown for food" was not established until the 18th century.^[3] In 1767, the word was specifically used to mean a "plant cultivated for food, an edible herb or root". The year 1955 noted the first use of the shortened, slang term "veggie".^[4]
As an adjective, the word vegetable is used in scientific and technical contexts with a different and much broader meaning, namely of "related to plants" in general, edible or not — as in vegetable matter, vegetable kingdom, vegetable origin, etc.^[2]

Some common vegetables

Some common vegetables
Image	Description	Parts used	Origin	Cultivars	World production (×106 tons, 2012)[17]
	cabbage Brassica oleracea	leaves, axillary buds, stems, flowerheads	Europe	cabbage, red cabbage, Savoy cabbage, kale, Brussels sprouts, kohlrabi, cauliflower, broccoli, Chinese broccoli	70.1
	turnip Brassica rapa	tubers, leaves	Asia	turnip, rutabaga, Chinese cabbage, napa cabbage, bok choy, collard greens
	radish Raphanus sativus	roots, leaves, seed pods, seed oil, sprouting	Southeastern Asia	radish, daikon, seedpod varieties
	carrot Daucus carota	root tubers	Persia	carrot	36.9[n 1]
	parsnip Pastinaca sativa	Root tubers	Eurasia	parsnip
	beetroot Beta vulgaris	tubers, leaves	Europe, Near East and India	beetroot, sea beet, Swiss chard, sugar beet
	lettuce Lactuca sativa	leaves, stems, seed oil	Egypt	lettuce, celtuce	24.9
	beans Phaseolus vulgaris Phaseolus coccineus Phaseolus lunatus	pods, seeds	Central and South America	green bean, French bean, runner bean, haricot bean, Lima bean	44.6[n 2]
	broad beans Vicia faba	pods, seeds	North Africa South and southwest Asia	broad bean
	peas Pisum sativum	pods, seeds, sprouting	Mediterranean and Middle East	pea, snap pea, snow pea, split pea	28.9[n 2]
	potato Solanum tuberosum	root tubers	South America	potato	365.4
	aubergine/eggplant Solanum melongena	fruits	South and East Asia	eggplant (aubergine)	48.4
	tomato Solanum lycopersicum	fruits	South America	tomato, see also list of tomato cultivars	161.8
	cucumber Cucumis sativus	fruits	Southern Asia	cucumber, see also list of cucumber varieties	65.1
	pumpkin/squash Cucurbita spp.	fruits, flowers	Mesoamerica	pumpkin, squash, marrow, zucchini (courgette), gourd	24.6
	onion Allium cepa	bulbs, leaves	Asia	onion, spring onion, scallion, shallot, see also list of onion cultivars	87.2[n 2]
	garlic Allium sativum	bulbs	Asia	garlic	24.8
	leek Allium ampeloprasum	leaf sheaths	Europe and Middle East	leek, elephant garlic	21.7
	pepper Capsicum annuum	fruits	North and South America	pepper, bell pepper, sweet pepper	34.5[n 2]
	spinach Spinacia oleracea	leaves	Central and southwestern Asia	spinach	21.7
	yam Dioscorea spp.	tubers	Tropical Africa	yam	59.5
	sweet potato Ipomoea batatas	tubers, leaves, shoots	Central and South America	sweet potato, see also list of sweet potato cultivars	108.0
	cassava Manihot esculenta	tubers	South America	cassava	269.1

Nutrition and health

Southeast Asian style stir fry ipomoea aquatica in chili and sambal

Vegetables (and some fruit) for sale on a street in Guntur, India

Vegetables play an important role in human nutrition. Most are low in fat and calories but are bulky and filling.^[18] They supply dietary fibre and are important sources of essential vitamins, minerals and trace elements. Particularly important are the antioxidant vitamins A, C and E. When vegetables are included in the diet, there is found to be a reduction in the incidence of cancer, stroke, cardiovascular disease and other chronic ailments.^[19][20] Research has shown that, compared with individuals who eat less than three servings of fruits and vegetables each day, those that eat more than five servings have an approximately twenty percent lower risk of developing coronary heart disease or stroke.^[21] The nutritional content of vegetables varies considerably; some contain useful amounts of protein though generally they contain little fat,^[22] and varying proportions of vitamins such as vitamin A, vitamin K and vitamin B₆, provitamins, dietary minerals and carbohydrates. Vegetables contain a great variety of other phytochemicals (bioactive non-nutrient plant compounds), some of which have been claimed to have antioxidant, antibacterial, antifungal, antiviral and anticarcinogenic properties.^[23][24]
However, vegetables often also contain toxins and antinutrients which interfere with the absorption of nutrients. These include α-solanine, α-chaconine,^[25] enzyme inhibitors (of cholinesterase, protease, amylase, etc.), cyanide and cyanide precursors, oxalic acid and others.^{[citation needed]} These toxins are natural defenses, used to ward off the insects, predators and fungi that might attack the plant. Some beans contain phytohaemagglutinin, and cassava roots contain cyanogenic glycoside as do bamboo shoots. These toxins can be deactivated by adequate cooking. Green potatoes contain glycoalkaloids and should be avoided.^[26]
Fruit and vegetables, particularly leafy vegetables, have been implicated in nearly half the gastrointestinal infections caused by norovirus in the United States. These foods are commonly eaten raw and may become contaminated during their preparation by an infected food handler. Hygiene is important when handling foods to be eaten raw, and such products need to be properly cleaned, handled and stored to limit contamination.^[27]

Dietary recommendations

The USDA Dietary Guidelines for Americans recommends consuming five to nine servings of fruit and vegetables daily.^[28] The total amount consumed will vary according to age and gender, and is determined based upon the standard portion sizes typically consumed, as well as general nutritional content. Potatoes are not included in the count as they are mainly providers of starch. For most vegetables and vegetable juices, one serving is half of a cup and can be eaten raw or cooked. For leafy greens, such as lettuce and spinach, a single serving is typically a full cup.^[29] A variety of products should be chosen as no single fruit or vegetable provides all the nutrients needed for health.^[21]
International dietary guidelines are similar to the ones established by the USDA. Japan, for example, recommends the consumption of five to six servings of vegetables daily.^[30] French recommendations provide similar guidelines and set the daily goal at five servings.^[31] In India, the daily recommendation for adults is 275 grams (9.7 oz) of vegetables per day.^[19]

Cultivation

Further information: Kitchen garden and Vegetable farming

Growing vegetables in South Africa

Vegetables have been part of the human diet from time immemorial. Some are staple foods but most are accessory foodstuffs, adding variety to meals with their unique flavors and at the same time, adding nutrients necessary for health. Some vegetables are perennials but most are annuals and biennials, usually harvested within a year of sowing or planting. Whatever system is used for growing crops, cultivation follows a similar pattern; preparation of the soil by loosening it, removing or burying weeds and adding organic manures or fertilisers; sowing seeds or planting young plants; tending the crop while it grows to reduce weed competition, control pests and provide sufficient water; harvesting the crop when it is ready; sorting, storing and marketing the crop or eating it fresh from the ground.^[32]
Different soil types suit different crops, but in general in temperate climates, sandy soils dry out fast but warm up quickly in the spring and are suitable for early crops, while heavy clays retain moisture better and are more suitable for late season crops. The growing season can be lengthened by the use of fleece, cloches, plastic mulch, polytunnels and greenhouses.^[32] In hotter regions, the production of vegetables is constrained by the climate, especially the pattern of rainfall, while in temperate zones, it is constrained by the temperature and day length.^[33]

Weeding cabbages in Colorado, US

On a domestic scale, the spade, fork and hoe are the tools of choice while on commercial farms a range of mechanical equipment is available. Besides tractors, these include ploughs, harrows, drills, transplanters, cultivators, irrigation equipment and harvesters. New techniques are changing the cultivation procedures involved in growing vegetables with computer monitoring systems, GPS locators and self-steer programmes for driverless machines giving economic benefits.^[33]