بررسی اثرات ارقام گندم و تراکم های بذر در کشت سطحی بذر گندم قبل از برداشت شلتوک در استان خوزستان

IN order to study on genotypes and seeding rate this experiment were conducted in farmers field an Dasht Azadehgan in a randomaized complete block with four replicated. The main factor genotype consisit of five genotypes ( three genotypes of bread wheat Star, Chamran and S-78-11 and two durum wheat Kharkheh and D-79-15(Behrang) and sub plot in two levels of seed density was 180 and 250 kg/ha. Planting seeds in the hand methods with out soil cover in the pre harvest rice farm ten days after water was cut off. Results showed that there are significant difference in yield between treatment seeding rate, while effects of varieties and interaction between their were not significant. Results indicate that the seed density of 700 seeds per square meter (250 kg/ha) was superior in 5% and 1 % than seed rate 500 seed/m2(200 kg/ha). Comparisons of mean grain yield of bread and durum wheat in this research shows that there is no statistically significant difference between cultivars. Microclimate conditions within residue management in wheat cultivars with different maturity stages of sustainable growth are roughly equal. Therefore in this study due to early planting varieties either different maturity levels in the planting of the seed is planted in a rice field residue. Despite the lack of significant wheat Star in this study compared to other varieties, was superior to other varieties. Interaction effects of seed density and wheat showed that the star with 250 kg / ha seed rate was superior to other varieties, and the staticitical level five and one percent is superior to other interactions.