Main content area

Effect of Thinning on Stand, Yield, and Plant Height in Maize

Hallauer, Arnel R., Sears, J. H.
Crop science 1969 v.9 no.4 pp. 514-515
botany, Plant Science and Plant Products
We conducted experiments at two locations for 4 years to determine the effect of thinning on stand, yield, and plant and ear height of maize (Zea mays L.). We included a control (no thinning) and over-planting and thinning at three stages of plant development (2 to 3, 5 to 8, and 9 to 11 leaf-stages) in all experiments. Average stand improvement was 8% over the control regardless of the stage of thinning. Thinning at the 5 to 8 and 9 to 11 leaf-stages resulted in significantly lower yields than thinning at the ''. to 3 leaf stage. Yields of the control plots were not significantly different from the yields obtained on the plots thinned at the 5 o 8 leaf-stage, the latter having 8% higher stands. Plant and ear height also decreased with the later stages of thinning. The experiments showed that over-planting and thinning was justified for improving stands, but that thinning at different sages did affect yield of grain significantly.