氮磷钾营养对春大豆产量品质效应的研究

Studies of the Effect of NPK Nutrients on the Yield and Quality of Spring Soybean

研究了红壤旱地上氮磷钾营养对春大豆产量品质的影响，结果表明：施用一定量氮肥有利于大豆根瘤的形成和固氮，施氮量过大则对结瘤有抑制作用；氮磷钾肥合理用量及配比有利于植株吸收养分和干物质积累，协调生长，从而提高产量改善品质；施肥主要是通过提高单株分枝数、单株荚数和粒数而增产，对百粒重影响较小。本试验条件下，氮肥用量以１２０～１６５ｋｇ／ｈｍ２，氮磷钾配比以（０．９８～１．２）∶０．９８∶１为宜。

Deals with the effect of NPK nutrients on the yield and quality of spring soybean in red soil upland.The results showed that appling certain amount of nitrogen fertilizer promoted nodulation and nitrogen fixation.But high amount of it performed inhibition;Proper amount of NPK Chemical fertilizer applied and their ratio promoted the nutrients uptake by plant and accumulation of dry matter,improved the quality of soybean,and increased the yield mainly by increasing the number of branch,pod and grain per plant.But the 100-grain weight varied little,relatively.Under the experimental condition,the proper amount of the nitrogen fertilizer applied and the ratio of N∶P 2O 5∶K 2O of NPK fertilizer were 120～165kg/hm 2 ,0.98～1.2∶0.98∶1,respectively.