بررسي كشت تاخيري هيبريدهاي اميدبخش داخلي و خارجي ذرت در شرايط كشاورزان استان فارس

Study of Delayed Planting in Foreign and Local Promising Maize Hybrids in Fars Province

Fars province produces about one half of the corn grain production in Iran. The main hybrid in this area is SC704 whose yield is decreased by maize rough dwarf virus in early and normal planting dates in temperate regions in Fars Province and some other Provinces. Delayed planting is a good method for prevention of this disease because the population of virus vector (laodelphax striate 11 us) is decreased in seedling stage in late planting dates. Seven foreign and two local promising hybrids were compared with SC704 and each other in 5 locations. Randomized complete block design with four replications were used in each location. Combined analysis of variance showed that hybrids BC666 and 4G-3261 produced 14 and 13.5 t/ha of grain yield respectively. They yielded more than the other hybrids but they had late maturiry similar to SC704. Hybrids SC260 and SC302 had less grain yield with good grain moisture percent in harvesting time (about 9-10 t /ha) but they had early maturity. Hybrids 4G- 3337 and BC5982 had suitable grain yield with good grain moisture percent at harvesting time. Finally, we can conclude that hybrids number 9 and 2 (BC666 and 4G-326I ) are suitable for southern locations and hybrids number 1, 6, 7 and 8 (4G-3337, BC5982, SC260 and SC302) are well fitted for planting in central and about northern locations of Fars province. Farmers in temperate regions can confidently use SC260 in the second planting.