Combined fertilization of N,P,K and S also obviously regulated grain yield,and effect of S and N on yield was at 0.01 significant level,while effect of P and K was not. N70P120K180S30 treatment was the optimum combination.

• 氮磷钾硫配施对籽粒产量也有明显的调节作用,硫氮对产量的影响达到极显著水平,是影响冬小麦产量的最大因子,而磷肥、钾肥对产量影响不显著,N 70P 120K 180S30是最佳水平组合。