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Paper Information

Journal:   CROP PHYSIOLOGY   spring 2018 , Volume 10 , Number 37 ; Page(s) 83 To 96.

The response of corn genotypes to nitrogen and competition with weeds

This experiment was conducted to investigate the effect of nitrogen on yield and nitrogen use efficiency of corn genotypes under the conditions of competition with weeds and as split plots in a randomized complete blocks design with four replications. In the main plots, three amounts of nitrogen fertilizer (90, 180 and 260 kilogram net nitrogen per hectare from source of urea (46 percent nitrogen) and without fertilizer, and in the subplots of four corn hybrids SC. 704, DKC6589, Mobin and SC. 640 were compared. Each sub plot was hypothetically divided into two weed free and with weed equal parts. The results showed that nitrogen application efficiency in plots with weeds was significantly decreased. The presence of weeds caused the average weight of 100 seeds, grain yield and biological yield to be reduced by 5. 3, 21. 7 and 24 percent, respectively, in comparison to weeding conditions. The use of nitrogen fertilizer up to 180 kilogram per hectare increased the grain yield of all genotypes under conditions of competition with weed. In conditions of competition, the performance of all genotypes with the exception of DKC6589 line decreased at 260 kilogram nitrogen per hectare treatment as compared to 180 kilogram nitrogen per hectare treatments. So that in the weed presence conditions, the average corn yield increased by 50 and 30 percent in 180 and 260 kilogram nitrogen per hectare in fertilizer treatments, respectively. The highest grain yield in both conditions of competition and weeding of weeds (908 and 1222 kilogram per hectare, respectively) was allocated to DKC6589 line. Increasing nitrogen rate increased the mean plant height of corn genotypes in both competition and weeding conditions. Plant height, ear height from the surface of ground, and the number of leaves of DKC6589 line was significantly higher than other corn genotypes. Plant height, ear altitude from the ground and leaf number of DKC6589 were significantly higher than other hybrids.
Keyword(s): Plant height,Ear height,Corn and Biological yield
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