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棉花生长期长,要获得丰产,必须在每个生育阶段满足它所需要的养分。施用追肥对棉花增产的效果是很显著的。1955年河南汝南县光明农业生产合作社在同样的棉田上,施追肥的(每亩分两次施,用硫铵18斤)每亩产量超过不追肥的34.5%。因此,棉田除施用基肥外,在棉花生育期中还要及时施用追肥。棉花生长发育时期需要补充的养分,主要的是氮、磷、钾。氮素是构成植物体细胞原形质的主要原料,氮素缺乏时,常造成棉株瘦
Long cotton growing season, to obtain high yield, must meet the needs of each fertility stage of its nutrients. Application of top dressing on cotton yield is very significant. In 1955, Henan Runan County Guangming Agricultural Cooperative produced more than 34.5% of the non-topdressing per mu in the same cotton field, topdressing (applying twice per acre and using 18 kg of ammonium sulfate). Therefore, in addition to the application of cotton base fertilizer, but also in the cotton growth period in time to apply top dressing. Cotton growth and development needs additional nutrients, mainly nitrogen, phosphorus and potassium. Nitrogen is the main raw material of plant somatic protoplasts. When nitrogen is deficient,