氮磷钾硫的施用对冬小麦光合特性及产量的影响

试验于河南农业大学科教示范团区进行，以强筋小麦豫麦34为试验材料，研究了氮磷钾硫对小麦光合特性及籽粒产量的影响。结果表明，在本试验范围内，氮磷硫肥用量对强筋小麦群体光合速率、叶绿素含量和硝酸还原酶活性均具有明显的调节作用，各因子不同供给水平对光合特性指标的影响均表现为随施用量的增加而提高，但于花后不同时期处于主导地位的肥料因子有所不同。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，N70P120K180S30是最佳水平组合。

Effect of N, P, K and S Fertilization on Photosynthetic Characteristics and Grain Yield of Winter Wheat

The experiments were carried out on the farm of Henan agricultural university, during 2003-2004, using high-gluten cultivar Yumai 34 as material. This study was to clarify photosynthetic characteristics and grain yield variations with different N, P, K and S rates, so as to provide some experimental foundations for reasonable N, P, K and S fertilization of wheat. The results of the study revealed that under the field fertility of this experiment, rates of N, P, K and S had obvious adjust effect on canopy photosynthetic rate, chlorophyll content and nitrate reductase activity, and all photosynthetic characteristics indices increased with N, P, K and S supply, but the most powerful fertilizer factor at different date after anthesis was different. 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. NTOP120K180S30 treatment was the optimum combination.