Irrigation should be terminated when kernels are in the R3 or milk stage. Ninety percent of water uptake is within 3' of the soil line. Additional roots are primarily used for anchoring the plant. Soil type and moisture level are major considerations when planning an irrigation program. Nutrients Corn requires high levels of nutrients relative to other crops.
Crop rotation is useful in increasing soil fertility, though inputs are often required.
An important nutrient commonly added to soil is nitrogen. Often, without nitrogen additions, maximum yield cannot be achieved. In addition, phosphate and potash are often useful for increasing yield. Variable application rates of these chemicals are recommended for different regions of the state, depending on soil qualities and other factors. Sulfur and magnesium are also important for corn development.