盆栽试验和大田试验结果表明,苜蓿改良的盐碱土壤仍以施N肥对小麦的增产作用最明显,盆栽小麦可增产61.2％,相对叶重增加16.2％,穗粒数增加37.36％,穗粒重增加10.3％;施P肥小麦增产16.78％,穗粒重增加8.39％,但对穗粒数影响较小;施K肥效果不明显;NP结合施用小麦增产74.76％。大田试验施N肥小麦可增产60％;NP结合施用小麦增产73.5％。施N补P是苜蓿改良的盐碱土壤作物增产的关键,也是该类地区的共性问题。 The results of pot experiment and field experiment showed that alfalfa improved saline-alkali soil still had the most obvious effect of increasing N fertilizer on wheat yield, potted wheat increased yield by 61.2%, relative leaf weight increased by 16.2%, grain number increased by 37.36% P fertilizer increased yield by 16.78% and spikelet weight increased by 8.39%, but had less effect on grain number per spike. However, application of K fertilizer had no obvious effect. NP combined application of wheat increased yield by 74.76%. Field experiment N fertilizer wheat yield increased 60%; NP combined with wheat yield 73.5%. Applying N supplement P is the key to the yield increase of alfalfa improved saline-alkali soil crop and also the common problem in this area.