Effect of Different Blend Ratios of Controlled Released Urea and Conventional Urea on Wheat Yield and Fertilizer-Nitrogen Use Efficiency

The experiments of different blend ratios of the controlled released urea and conventional urea were conducted in Xinpo Village and Hexing Farm,respectively.The results showed that,the yields of the blend ratios of 70% controlled released urea and 30% conventional urea were the best,which were 8 000 kg·hm-2 and 8 150 kg·hm-2,for Xinpo Village and Hexing Farm,respectively,increasing by 6.2% and 7.2% compared with the 100% release-controlled urea test,by 17% and 16.7% compared with the 100% conventional urea test,and by 39.9% and 34.5% compared with the contrasting test.The significance difference between these tests amounts to 1%.