كليدواژه :
late sowing dates , corn hybrid SC604 , plant density , تاريخ كاشتهاي ديرهنگام , تراكم , عملكرد دانه , SC406 ذرت هيبريد
چكيده لاتين :
In order to study the effect of late planting dates and optimum plant density on yield and growth pattern of SC 604 corn hybrid, an experiment was conducted in 1.995-1997 at Ramin Agricultural Research and Education School, which is lonated 36 km north of Ahwaz city. The design of the experiment was a split plot in which main plots were consisted of 3 planting date (August 15, September 1, and 15) and subplots of 4 plant densities (70, 80, 90 and 100 thousands plants in hectare) with completely randomize block bases. The experiment replicated 4 times. Analysis of variance showed that there was significant difference between planting dates and highest yield (12.31 t/ha) was obtained from August 15 planting date. The highest yield (9.82 Oa) was obtained from 80 thousansds plants ha-1. Among yield components, number of kernels per row and kernel weight showed the highest sensitivity to planting date. Number of kernels per ear row and kernel weight in August 15 were higher than that of September. Different plant densities influenced yield components. Seventy thoushands plants had, due to wider spaces between plants, effected on yield components considerably. The variations in the out put of leaf, stem, ear and total dry matter as a function of time followed second - degree equation, in such a way that after reaching to maximum point it tended to decline. Maximum plant thy matter was obtained from the 80,000 plants ha and planting date at August 15 (about 100 days ofter sowing). Thus, August 15 and 80,0(0) plants per ha-1 recommended to this area.
