甘肃高寒阴湿区播种方式和氮肥施用量对猫尾草种质生产性能的影响

Effects of Sowing Method and Nitrogen Fertilizing Rate on Production Performance of Timothy Genotypes in Alpine and Humid Regions of Gansu

采用裂区试验设计,通过研究甘肃高寒阴湿区4个氮肥施用量(A1:施纯氮量0 kg/hm^(2),A2:施纯氮量90 kg/hm^(2),A3:施纯氮量180 kg/hm^(2),A4:施纯氮量360 kg/hm^(2))和3种播种方式(B1:条播,B2:撒播,B3:点播)对4个猫尾草种质(C1:新品系,C2:‘川西’,C3:‘岷山’,C4:‘克劳沃1号’)生产性能的影响,以筛选出最佳氮肥施用量、最佳播种方式和最佳猫尾草种质。结果表明,从单因素看,4个氮肥施用量间,A4的平均生产性能最好;3种播种方式间,B3的平均生产性能最好;4个猫尾草种质中,C1的平均生产性能最好。从二因素交互作用看,氮肥施用量×猫尾草种质交互作用间,A4C3的平均生产性能最好;播种方式×猫尾草种质交互作用间,B3C1的平均生产性能最好;氮肥施用量×播种方式交互作用间,A4B3的平均生产性能最好。从三因素交互作用看,C1在A2B3处理下生产性能最好;C2和C4在A4B3处理下生产性能最好;C3在A4B2处理下生产性能最好。综上,新品系的最佳氮肥施用量为90 kg/hm^(2),最佳播种方式为点播;‘川西’和‘克劳沃1号’的最佳氮肥施用量为360 kg/hm^(2),最佳播种方式为点播;‘岷山’的最佳氮肥施用量为360 kg/hm^(2),最佳播种方式为撒播。

To determine the optimal nitrogen fertilizing rate,sowing method,and the suitable timothy genotype,a split-plot design was employed to study the effects of four nitrogen fertilizing rates(A1:0 kg/hm^(2),A2:90 kg/hm^(2),A3:180 kg/hm^(2)and A4:360 kg/hm^(2))and three sowing methods(B1:drill,B2:broadcast and B3:dibble)on the production performance of four timothy genotypes(C1:New timothy line,C2:‘Chuanxi’,C3:‘Minshan’and C4:‘Clover 1’)in an alpine and humid area of Gansu province.Single factor analysis showed that treatment A4 had the highest average production performance among the four nitrogen fertilizing rates,while B3 had the best average production performance among the three sowing methods,C1 had the highest average production performance among the four genotypes.The interaction between two factors showed that,treatment A4C3 had the highest average production performance among the interactions between nitrogen fertilizing rates and genotypes,while the treatment B3C1 had the best average production performance among the interactions between sowing method and genotypes,the treatment A4B3 had the highest average production performance between the interactions between nitrogen fertilizing rates and sowing methods.The interaction of the three factors showed that C1 had the best average production performance under treatment A2B3,while C2 and C4 had the best average production performance under treatment A4B3,C3 had the highest average production performance under treatment A4B2.In conclusion,for the new timothy line,a nitrogen fertilizing rate of 90 kg/hm^(2)and dibble sowing are the best sowing method.For‘Chuanxi’and‘Clover 1’,the best nitrogen fertilizing rate is 360 kg/hm^(2),and dibble sowing is the preferred sowing method.On the other hand,for‘Minshan’,the best nitrogen fertilizing rate is also 360 kg/hm^(2),but,the broadcast sowing,is the recommended sowing method.