The Effects of Planting Dates and Seeding Rates on the Yield and Yield components in Winter Wheat

Under rain-fed condition,the effects of planting dates and seeding rates on the yield and yield components in winter wheat were investigated with local popular winter cultivar Yannong19.The yield was affected significantly by both planting dates and seeding rates,especially planting dates.The interaction of the two factors(planting dates and seeding rates) also had significant effect on the yield.The yield components were influenced by both planting dates and seeding rates.The above results indicated that the coordination between planting dates and seeding rates was important for increasing grain yield in wheat.It could be concluded that in this area,the optimal planting date should be from 2nd October to 15th October and the seeding rate should be settled at the range from 80 thousand to 230 thousand viable seeds per mu.In order to reach the maximum yield,the planting date should be from 5th October to 12th October and the seeding rate should be from 130 thousand to 180 thousand viable seeds per mu.