通过盆栽试验、田间试验研究了紫色土壤施氮对棉花产量品质的效应。结果表明，施氮对棉花产量有极显著的增产效应，氮与产量的效应模型呈二次抛物线型，施氮量２５０ｋｇ·ｈｍ－２时，棉花产量最高；氮对纤维品质有一定影响，能提高比强度，并有降低麦克隆值、增加细度的趋势，纤维品质受氮磷钾影响顺序为伸长度＞麦克隆值＞比强度＞整齐度＞２．５％跨距长度；施氮能增加棉花叶片中叶绿素含量，但对叶绿素ａ和叶绿素ｂ的含量比例无明显影响；土壤中氮的含量与棉株对氮的吸收和棉株体对氮的积累量呈显著和极显著的正相关。

The effects of nitrogen on cotton yield and fiber quality in purple soil have been investigated by pot and field test. The results indicated that the effect of fertilized nitrogen on increasing cotton yield was highly significant. The effect model between nitrogen and yield just presented quadratic parabola and the cotton yield would be the highest when the fertilized nitrogen amount was 250kg/ha. The interaction effect between nitrogen and planting density was larger than that between nitrogen and 1, 1- d...