滴灌大豆氮素积累与分配的肥效差异

利用节水滴灌技术，通过设置不同的肥料用量和施肥时期处理，研究其对滴灌大豆氮素积累、分配、利用及产量的影响，以形成节水灌溉与施肥相结合的栽培技术。其中种肥为尿素75kg/hm2、磷酸二铵150kg/hm2、硫酸钾90kg/hm2；滴肥为尿素127.5 kg/hm2、磷酸二氢钾为133.5 kg/hm2。结果表明，在滴灌条件下前期种肥的供给对大豆氮素积累及产量的形成非常重要，T1（1/2种肥）、T2（种肥）、T4（1/2种肥+花期1/2滴肥）、T5（1/2种肥+结荚期1/2滴肥）处理的滴灌大豆氮素积累量大，转移率和吸收利用率较高。综合产量因素，在施用种肥，结荚期再施用滴肥(即T5处理下)，施肥方式效果最佳。

Nitrogen accumulation and distribution in soybean under fertigation

Effect of fertilization on nitrogen accumulation,distribution,utilization and soybean yield were studied under different seed fertilizers and drip fertilizers.The seed fertilizer included 75kg/hm2 carbamide,150kg/hm2 diammonium phosphate,90kg/hm2 potassium sulfate.The drip fertilizer included 127.5kg/hm2 carbamide,133.5kg/hm2 potassium dihydrogen phosphate.Results showed that seed fertilizer supply at early stage was important to promote nitrogen accumulation and yield under drip irrigation.Nitrogen accumulation,nitrogen transfer rate and utilization rate under T1(half seed fertilizer),T2(seed fertilizer),T4(half seed fertilizer,and half fertilizer with drip fertilizer at florescence period),and T5(half seed fertilizer,and half fertilizer with drip fertilizer at pod-setting stage) were higher.Among them,T5 fertigation was the best for high yield.