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空心多茎株型是作者首创的短季棉高光效株型 ,它克服了短季棉的自身生理缺陷 ,显著提高了短季棉的产量和品质。本文探讨了施氮量对其产量和主要生育性状的影响。从实际产量看 ,75 .0kg·hm- 2 纯氮即能显著提高空心多茎株型的皮棉产量 ,施氮利润也稳定较高 ,继续增施氮肥 ,皮棉产量不再有明显变化 ;从回归分析看 ,施氮量对皮棉产量的效应曲线符合开口向下的抛物线模型 ;从产量结构和干物质积累看 ,施氮主要是增加了单铃重和干物质积累量 ,其次是单株成铃 ,而对衣分和经济系数无明显影响 ;从单株功能叶片、叶片鲜干比和叶铃比看 ,它们受施氮量影响最大 ,与干物质积累量和皮棉产量均呈显著正相关关系 ;从单株果节(潜在库量 )看 ,它受施氮量影响中等 ,与干物质积累量和皮棉产量均呈不显著正相关关系。从总的看 ,强源是空心多茎株型施氮增产的主要原因 ,扩库对产量的作用是有限的 ;低氮量即能显著提高空心多茎株型的皮棉产量 ;继续增施氮肥 ,空心多茎株型只对氮素表现出较强的适应性 ,而没能充分发挥其产量潜力 ;产量潜力的发挥需要一整套栽培技术的支撑。
Hollow multi-stem plant type is the author of the first quarter of high-efficiency cotton plant type, it overcomes the short-season cotton’s own physiological defects, significantly increased short-season cotton yield and quality. This paper explored the effects of nitrogen rates on yield and main fertility traits. From the actual yield, 75. 0kg · hm-2 of pure nitrogen could significantly increase the lint yield of hollow stems and plants, nitrogen fertilizer also had a higher stability. With the increase of nitrogen fertilizer, the yield of lint no longer changed obviously. According to the analysis of yield structure and dry matter accumulation, nitrogen application increased the boll weight and dry matter accumulation, followed by boll bolls , But had no obvious effect on the lint percentage and economic coefficient. From the function leaves, leaf fresh-dry ratio and leaf boll ratio, they were most affected by the amount of nitrogen application, positively correlated with the dry matter accumulation and lint yield From the single fruit node (potential stock), it was moderately influenced by N application rate, and had no significant positive correlation with dry matter accumulation and lint yield. In general, the strong source is the main reason for the increase of yield of nitrogen with hollow stems and plants, and the effect of expansion is limited to the yield. Low nitrogen can significantly increase the lint yield of hollow stems and plants; , Hollow stems only show strong adaptability to nitrogen, but failed to give full play to their yield potential; the production potential needs to play a set of cultivation techniques support.