Effects of nitrogen fertilizing rates on the production performance and nutrient composition of timothy genotypes in alpine and humid regions of Gansu
[Objective]The study is aimed to clarify the effects of different nitrogen fertilizing rates(A1,0 kg/hm2;A2,90 kg/hm2;A3,180 kg/hm2;A4,360 kg/hm2)on the production performance and nutrient composition of different timothy genotypes in alpine and humid regions of Gansu Province,so as to screen out the best nitrogen fertil-izing rate and timothy genotype.[Method]A split plot experiment was conducted to study the effects of four nitrogen fertilizing rates(A1,0 kg/hm2;A2,90 kg/hm2;A3,180 kg/hm2;A4,360 kg/hm2)on the plant height,number of branches,fresh(dry)yield and nutrient composition of four timothy genotypes(B1:new timothy line,B2:Chuanxi,B3:Minshan,B4:Clover No.1).[Result]Among the 4 nitrogen fertilizing rates,when A4 treatment were applied,the average plant height and fresh(dry)yield were the highest,and the average crude protein(CP)content and ether extract(EE)content were higher.For all timothy genotypes,the new timothy line had the highest average plant height,fresh(dry)yield,CP content and EE content under 4 nitrogen fertilizing rates,and the forage quality was higher.The interaction between nitrogen fertilizing rates and timothy genotypes showed that the nitrogen fertilizing rates had a significant effect on the production performance of the 4 timothy genotypes.New timothy line had the best production performance and nutrient composition under treatment 90 kg/hm2.Chuanxi and Clover No.1 had the best production performance under treatment 360 kg/hm2 and Minshan had the best production performance under treat-ment 180 kg/hm2.[Conclusion]For new timothy line,the best fertilization amount is 90 kg/hm2.For Chuanxi and Clover1,the best fertilization amount is 360 kg/hm2.On the other hand,for Minshan,the best fertilization amount is also 180 kg/hm2.
万方数据
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