试验结果表明,在氮肥施用量,稀土浓度、稀土喷施时期之间存在着交互作用。不同N、P水平下,稀土浓度和喷施时期对棉株生物量的影响有三种类型:(1)先抑制后促进,(2)先促进后稍有抑制;(3)一直处于抑制状态。其机理尚不清楚。稀土施用对棉株N、P、K含量有较明显的影响。N含量主要受稀土喷期和浓度两者的影响,而P、K含量主要受稀土浓度影响。其中P含量的变动与籽棉产量呈负相关,这可能与供试土壤有效磷含量特高(79.5ppm),引起元素之间比例失调有关。 The experimental results show that there is an interaction between nitrogen application rate, rare earth concentration and rare earth spraying period. Under different levels of N and P, the effects of rare earth concentration and spraying period on biomass of cotton plants were classified into three types: (1) inhibition first and then promotion; (2) slight inhibition first; (3) always in the state of inhibition. The mechanism is not clear. Rare earth application of cotton plant N, P, K content have a more significant impact. The content of N is mainly affected by the spraying duration and concentration of rare earth, while the content of P and K is mainly affected by the concentration of rare earth. Among them, the change of P content was negatively correlated with the seed cotton yield, which may be related to the unusually high content of available phosphorus (79.5ppm), which caused the imbalance of the elements.