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Maize (Zea mays) is today the most widely grown grain crop, with global production standing at just over one billion tons. This is 38% of total grain production, which amounts to 2,6 billion tons. (Wheat comes in second at about 750 million tons, and rice third at about 480 million tons).
In 2017, South African maize production was 17,5 million tons, an all-time record for the country. Maize is a warm-weather crop; it is unsuitable for areas with a mean daily temperature of below 19°C, or where the mean summer temperature falls below 23 °C.
Although the minimum temperature for germination is 10°C, germination will be faster and less variable at a soil temperature of 16°C to 18°C. At 20°C, maize should emerge within five to six days. Yield is reduced if the temperature reaches about 32°C.
At the other extreme, frost can damage maize at all growth stages, and a frost-free period of 120 to 140 days is required to prevent damage. A yield of 3,2t/ha requires between 350mm and 450mm of rain per annum. At maturity, each plant will have used 250ℓ of water in the absence of moisture stress.
The most suitable soil for maize has generous depth, a favourable structure, good internal drainage, optimal moisture, sufficient and balanced plant nutrients, and chemical properties that favour maize production. Although maize is produced on a large scale in soils with a clay content below 10% (sandy soils) or above 30% (clay and clay-loam), the ideal soil for maize has a clay content of between 10% and 30%.
Several methods, each with its own limitations, can be used to determine yield potential. One of the most reliable is long-term yield data collected by individual farmers, as this reflects the inherent yield of the specific environment, as well as the effect of agronomic practices such as fertilisation, soil cultivation and plant density.
In a 100 gram serving, maize kernels provide 86 calories and are a good source (10-19% of the Daily Value) of the B vitamins, thiamin, niacin, pantothenic acid (B5) and folate (right table for raw, uncooked kernels, USDA Nutrient Database). In moderate amounts, they also supply dietary fiber and the essential minerals, magnesium and phosphorus whereas other nutrients are in low amounts (see table on right). Maize is the subject of genetic engineering research to improve levels of carotenoids, such as provitamin A, beta-carotene.
|Nutritional value per 100 g (3.5 oz)|
|Energy||360 kJ (86 kcal)|
|Dietary fiber||2 g|
|Aspartic acid||0.244 g|
|Glutamic acid||0.636 g|
|Vitamin A equiv.
Pantothenic acid (B5)
Source: USDA Nutrient Database