棉用HA复合肥用量与增产机理的研究

Study on the Mechanism of Output-increase and Applied Amount of the HA Compound Fertilizer for Cotton Use

系统地研究了棉花专用腐植酸（HA）复合肥的增产效果、合理用量及其同多种生理指标的相关关系。结果表明，在施肥成本相等条件下，棉用HA复合肥比进口磷酸二铵和无机棉花专用肥（国产）分别增收皮棉246kg／hm2，279kg／hm2。该复合肥对土壤有机质含量具有超补偿效应。土壤养分含量、植株体内养分含量、叶绿素含量、光合强度、蒸腾强度、硝酸还原酶（NR）、超氧化物歧化酶（SOD）及（POD）活性与棉用HA复合肥用量间均呈显著或极显著正相关。气孔阻力与HA复合肥用量呈显著负相关。皮棉产量与该复合肥用量及上述营养指标和生理指标之间呈显著正相关。最高皮棉产量为1995kg／hm2，相应的HA复合肥用量为669．7kg／hm2。

This paper systematically intnduced the effect of HA compound fertilizer for cottonuse, its sutable amount, and the reatedip between some physilogical targetes and theamount of HA compound fertilizer supplied. The results showed that the batting output was in-creased by 246kg/hm2 by suppliing HA compound fertilizer than equavelant diammonium phos-phate, and increased by 279kg/hm2 than inorganic compound fertilizer with equal nutritionalamount. The nutrient content in the soil and cotton plant, chlorophyll content, the intensity ofphotosynthesis and transpiration of cotton leaves, and the activities of in plant were positivelydirect with the HA compound fertilizer amount and the cotton output. The HA compound fertil-izer amount that gen the highest batting output (1995kg/hm2) was 669. 7kg/hm2.