黄绵土雨养农业区冬小麦磷肥投入阈值研究

Study on Phosphorus Threshold of Winter Wheat in Rain Fed Agricultural Region of Loessal Soil

在相同施氮水平下,试验分析了不同磷肥施用量与有机肥配施对黄绵土雨养农业区冬小麦产量的影响,结果表明,在相同施氮水平下,施磷150 kg/hm2配施有机肥7 500 kg/hm2处理的穗粒数、穗粒重及千粒重均高于不施有机肥、不施磷肥处理,且折合产量最高,为5 317.60 kg/hm2,较不施有机肥、不施磷肥增产52.71%。可作为天水市及周边地区冬小麦磷肥的投入阈值。

Experiment is carried out to study the effects of different phosphorus application and different phosphorus application combined with manure on the yield of winter wheat in rain fed agricultural region of loessal soil under the same nitrogen level. The result showes that under the same nitrogen application, the grain number, ear weight and thousand-grain weight of phosphorus application （150 kg/hm2） combined with manure （7 500 kg/hm2） treatment are higher than that of other treatments, the yield is also the highest which is 5 317.60 kg/hm2, it is increased by 52.71% compared with the treatment without phosphorus and manure. It could be used as the phosphorus application threshold of winter wheat in Tianshui and the surrounding area.