Effects of plant density, nitrogen and defoliation on the yield and yield components of corn
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Date
1986
Authors
Danilo T. Benitez
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Abstract
IPB Var I was studied (1) to determine the effect of nitrogen and plant density on the yield of corn with defoliation, and (2) to compare the fresh weight of leaves removed above the ear and those removed below the ear and the subsequent efect of defoliation on the performance of the corn plant.
Higher plant density resulted in heavy fresh weight of defoliated leaves but decrease in ear length, ear diameter, weight of 1000 grains and total nitrogen content of defoliated leaves.
Nitrogen fertilization increased plant height, ear height, ear length, ear diameter, grain yield per plot, weight of 1000 grains and the total nitrogen content of defoliated leaves but reduced the number of days to silking.
Defoliation decreased grain yield per plot and the weight of 1000 grains.
The fresh weight of defoliated leaves below the ear was heavier than those above the ear at low plant density. Heavy fresh weight of defoliated leaves below the ear were obtained at high plant density.
Fresh weight of defoliated leaves below the ear was heavier from the fertilized plants while fresh weight of defoliated leaves above the ear at 0 to 180 kg N/ha were comparable.
Removal of leaves above the ear resulted to 16 percent lower grain yield while removal of leaves below the ear decreased grain yield by 15 percent.