The effect of different planting dates and application of ammonium sulphate on yield and yield components of Hyola rapeseed cultivar on winter planting in Mane and Samalghan

In order to study the effect of different planting dates and application of ammonium sulphate on yield and yield components of Hyola rapeseed cultivar in winter planting an experiment was conducted in climatic conditions of Mane and Samalghan during 2008-2009. The experiment was carried on factorial based on CRBD with four replications. The experiments were treatment included three planting dates (18 Sep., 4 Oct. and 19 Oct. of 2008) and four fertilizer treatment (base fertilizer 100 kg/ha urea, 80 kg/ha ammonium sulphate at beginning of spring and 80 kg/ha ammonium sulphate in maximum height of plant), (base fertilizer 100 kg/ha urea, 40 kg/ha ammonium sulphate at beginning of spring and 40 kg/ha urea in maximum height of plant), (base fertilizer 100 kg/ha urea, 40 kg/ha urea at beginning of spring and 80 kg/ha ammonium sulphate in maximum height of plant) and (base fertilizer 100 kg/ha urea, 40 kg/ha urea at beginning of spring and 80 kg/ha urea in maximum height of plant).Trait were considered as number of seed per pod, number of pod per plant, 1000 grains weight and grain yield. The results showed that second planting date was superior on number of seed per pod, number of pod per plant and grain and value of third fertilizer treatment on number of pod per plant, grain yield. Highest and lowest grain yield belonged to the second planting date and third fertilizer treatment with average 4.1 ton/ha and third planting date and fourth fertilizer treatment with average 3.2 ton/ha respectively.