棉花品种与氮磷底肥的增产效应研究

陆地棉(Gossypium hirsutum)不同熟性品种与氮、磷底肥三因素三水平正交盆栽试验结果表明:1988年单株棉花产量随氮肥用量增加而提高;品种间比较,皮棉产量以中12最高。1989年,单株铃数、子棉、皮棉产量随氮肥用量增加而提高,而品种仍以中12最高。增施磷肥有提高衣指和衣分的作用。不施化肥的对照,子棉产量只相当中肥处理的51.8%。两年大田试验的子棉、皮棉亩产量都以品种为主效应,中12皮棉产量最高,其突出优势是单株铃数、衣指和衣分高。增施氮肥会推迟吐絮期。

STUDIES ON YIELS EFFECT OF THE COTTON CULTIVARS AND BASE NITROGENOUS AND PHOSPHATE FERTILIZERS

An pot cross-experiment of upland cotton (Gos.ypium hirsutum) variety with different maturity base nitrogenous and phosphate fertilizers was carried out.The result showed that the yield of seed cotton per plant increased with the increase of the amount of nitrogenous fertilizer in 1988,But the lint cotton output was different with varieties,and Zhong 12 was the most,The quantities of the cotton bolls per plant and the seed and lint cotton output per plant were increased with the increase of the amount of nitrogenous fertilizer,They were also affected by varieties,Zhong 12 still was the most among them,The fiber index and lint percentage were increased with the increase of thd amount of phosphate fertilizer,The output of seed cotton per plant of Ck was only 51.8% of the mid-fertilizer treatment,The variety was the main effect for output of seed and lint cotton in two-yaer field experiments,The yield ogf lint cotton of Zhong 12 was the most,and the bolls per plant,fiber index and lint percentage were its great preponderance,The increasing of nitrogenous fertilizer would postpone the boll opening period.