不同施肥对滴灌大豆磷素积累与分配的影响

采用节水滴灌方式，研究肥料用量和施肥时期对滴灌大豆磷素积累、分配、利用及产量的影响，目的是探索节水灌溉与施肥相结合的灌溉施肥新模式。结果表明，在滴灌条件下前期种肥的供给对大豆磷素积累及产量的形成非常重要，T1（1/2种肥）、T2（种肥）、T3（3/2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）处理的滴灌大豆磷素积累量大，吸收利用率较高（种肥为尿素75 kg/hm2、磷酸二铵150 kg/hm2、硫酸钾90 kg/hm2，滴肥为尿素127.5 kg/hm2、磷酸二氢钾为133.5 kg/hm2）；综合产量因素，在种肥用量为尿素37.5 kg/hm2、磷酸二铵75 kg/hm2、硫酸钾45 kg/hm2的基础上，在结荚期再滴施尿素63.75 kg/hm2、磷酸二氢钾66.75 kg/hm2，这种滴灌施肥方式效果最佳。

Effect of different fertigation treatments on phosphorus accumulation and distribution in soybean

The experiment researched effect of fertilization rate and fertilizer time on phosphorus accumulation,distribution,utilization and yield of soybean under drip irrigation,and formated cultivation technique for the combination of water saving irrigation and fertilization.The results showed that it was important that seed fertilizer supply in the earlier stage promoted phosphorus accumulation and yield formation under drip irrigation;phosphorus accumulation amount,utilization rate of T1(1/2 seed fertilizer),T2(seed fertilizer),T3(3/2 seed fertilizer),T4(1/2 seed fertilizer+1/2 fertilizer with drip fertilizer at florescence),T5(1/2 seed fertilizer+1/2 fertilizer with drip fertilizer at pod setting stage) were higher(seed fertilizer were urea of 75 kg/hm2,diammonium phosphate of 150 kg/hm2,potassium sulfate of 90 kg/hm2;drip fertilizer were urea of 127.5 kg/hm2,potassium dihydrogen phosphate of 133.5 kg/hm2).When seed fertilizer rate were urea of 37.5 kg/hm2,diammonium phosphate of 75 kg/hm2,potassium sulfate of 45 kg/hm2,and on this basis,dressing fertilization rate were urea of 63.75 kg/hm2,potassium dihydrogen phosphate of 66.75 kg/hm2 during pod setting stage by drip irrigation,that fertilization modes by drip irrigation had the best effect under the consideration of yield factor.