The aim of every farmer is high maize yield, and there are a large number of agronomic factors that can influence this, many of which are within their control given the climatic and soil conditions. Once a variety has been selected matching the local growing conditions, maize is planted at a density allowing the development of one maize cob per plant. To achieve high maize yields, it is important to maximize the number of grains per cob and to increase the grain weight . Through a balanced crop nutrition program, the farmer would be able to accomplish this.
Potassium is most important for stomatal closure and low supplies result in loss of water from the plant.
Magnesium, sulphur and iron increase photosynthetic activity and maintain good growth for high yields. Calcium ensures good plant strength, protecting root, leaf and stalk production. Boron is required for pollen tube growth and good grain set. Zinc is important for photosynthetic activity.
Unavailability of any other micronutrient can also restrict growth processes and subsequent maize yield.