Effect of defoliation intensity on maize yield , yield components and seed germination

A field experiment and a laboratory experiment were conducted in 2011 to determine the effect of intensity of defoliation on yield of maize (Zea mays). The field experiment included seven defoliation intensities (0, 2, 4, 6, 8, 10 and whole leaves per plant) from top to bottom leaves. Seeds of the field experiment were used for the laboratory experiment. In the laboratory experiment, germination traits of seed produced from maternal plant under defoliation treatment were tested. Results showed that defoliation had a significant effect on seed yield, rows number per ear, seed number on row, cob length, cob weight and harvest index (P<5%). Seed yield was reduced by increasing defoliation intensity. The results suggest that the two upper leaves should not be defoliated, because this treatment has a remarkable negative effect on the seed and biological yield. Severe removal of leaves (T7) increased seed germination percentage, rate and vigor providing aevidence for maternal environmental effects on germination. [Hassan Heidari. Effect of defoliation intensity on maize yield, yield components and seed germination. Life Sci J 2012;9(4):1594-1598] (ISSN:1097-8135). http://www.lifesciencesite.com. 243