Interactions between fertilization and irrigation and plant density of maize (Zea mays L)

The results indicate that the plant cultivation factors are related to each other. The irrigation - fertilization and plant density - fertilization interactions are positive, and accordingly all three factors have to be adjusted simultaneously when production levels are changed. When disaggregating the variance components, the major averages showed a mid-tech level of production. When considering a shift to low-input production it should be considered that a decrease in the use of one production factor reduces the effects of the others; relatively high amounts invested in the other factors will not be effective. No matter what production level is targeted the most favorable interactions of water, nutrient supply and plant density have to be simultaneously assured.