优质新中粳苏粳815氮肥用量和分蘖期施用方式的研究

On Amount of Nitrogen Fertilizer Applied in New Variety Sujing No.815 of Middle-season Jing Rice and Fertilization Method in Tillering Stage

[目的]摸索苏粳815适宜的施肥量和分蘖期施肥方式,为苏粳815高产栽培提供依据。[方法]随机区组设计试验,分2个田间试验,即氮肥施肥量试验和分蘖期不同平衡肥试验。[结果]苏粳815产量最高的纯氮施用量是270 kg/hm2。平衡肥施用提高了分蘖成穗数,但降低了每穗粒数,最终影响产量的形成。[结论]人工移栽苏粳815高产栽培适宜施氮量为270 kg/hm2,分蘖肥一次施足,不需施用平衡肥。

The proper amount of nitrogen fertilizer was used in Sujing NO. 815 and the fertilization method in tillering stage was groped in the test for providing basis for its high-yield cultivation. [Method]Randomized block design was used in two field subtests： subtest of nitrogen fertilizer application and subtest of different balanced fertilizer applied in tillering stage. [Result] The nitrogen rate for the maximum yield of Sujing No. 815 was 270 kg /hm2. Application of balanced fertilizer increased the amount of productive tillers,but decreased the number of grain per ear,and finally influenced its yield formation. [Conclusion]The proper nitrogen rate applied in high-yield cultivation of Sujing No.815 by manual transplanting was 270 kg /hm2. And tillering stage dressing should be applied enough once and balanced fertilizer application wasn＇t required.