Effect of foliar applications of silicon and plant density on agronomic traits in corn hybrids Delayed planting of the summer

To investigate the effect of spray silicon and plant density on agronomic traits of two corn hybrids in late summer planted (27 August) Research Station Branch، Islamic Azad University، conducted an experiment in 2010 as a split-split plots in randomized complete block design with three replications was conducted. Two levels of silicon (sprayed and non-consumer) as the main factor and two maize hybrids (SC704 and SC640) as sub-factor and four planting densities (80،706،090 thousand plants per hectare) as minor factors were investigated. The effect of silicon was sprayed only on the number of seeds in rows in the 5% level of significance. Yield per unit area for hybrids SC640 was (20. 3 percent) higher than the hybrid SC704، because the single cross hybrid seed weight greater than SC640 (20. 8 percent). Harvest index and grain weight per ear for more than SC640 hybrids، SC704 were hybrids. Number of grains per row and ear to the ground and the number of days from sowing to maturity for the hybrid of SC704 more than hybrids SC640 was calculated. Number of grains per row، ear length، grain yield and planting density increased to 90 thousand plants per hectare Single plant decreasing trend of yield per unit area، but 9. 2 percent was higher. Maximum yield per unit area of interaction between silicon and planting density for density and 80 thousand plants per hectare was obtained with foliar applications of silicon. In general، corn planted in late summer for the West region of Mazandaran، single cross hybrid 640 with a density of 90 thousand plants per hectare is recommended.