【摘要】 连续四年六次试验结果表明,在豫东轻、中度盐碱土地区,棉田土壤既缺氮又缺磷,在施用氮肥基础上施用磷肥有较好的增产效果,增产幅度在10.3—53%之间,每公斤过磷酸钙增产皮棉0.4—0.76公斤。在土壤速效磷（P₂O₅）含量小于12ppm,亩产皮棉在40—60公斤产量水平下,每亩应施过磷酸钙（含P₂O₅12%左右）50公斤,60—100公斤产量水平下,应施用55公斤为宜。更多还原

【Abstract】 Four consecutive years’ experiments show that the cotton-field soil in low- degree and mid-degree salt-affected areas of east Henan lacks both nitrogen and phosphorus.On the basis of using nitrogen fertilizer,using phosphoric fertili- zer has a good effect on cotton yield.Also,it could make seedlings grow atr- onger and earlier,speed up the procedure of growth and develepment,increase bolls per plant and boll weight,and improve the economic features.The yawn yield could de raised by 10.3—53%.Each kilo of superphosphate might increase yawn by 0.4—0.76 kilo.On condition of soil rapidly available phosphorus being less than 12ppm,supposing the yawn yeild per mu ranges from 40 to 60 kilo it would be better to apply 50 kilo of superphosphate （containing about 12% P₂O₅）;The yield ranges from 60 to 100 kilo,to apply 55 kilo of supe- rphosphate.更多还原