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棉花不同生育期对氮、磷、钾三要素的要求,各国研究成果不仅从数量上颇不一致,就是以各期吸收绝对量占总量的百分率来比较,差别也是很明显的。据河北农科所的研究,出苗到现蕾期,吸收氮、磷、钾数量占总吸收量的百分率分别为10.74,5.80,8.11;现蕾到开花期为52.16,28.80,17.28;开花到老熟期为35.5,65.4,80.6。苏联普罗塔索夫研究:出苗到现蕾期吸收氮、磷、钾数量占总量的百分率分别力8.3,8.1,10.1;现蕾到棉铃形成期为59.6,58.3,63.5;棉铃形成到生产结束为31.1,33.6,26.4。而White的多年研究:出苗到初孕蕾期吸收氮、磷、钾的数量占总吸收量的百分率分别为34, 37,35;初孕蕾到初开花期为32,40,28;初开花到初吐絮为18,18,13;初吐絮到
Cotton at different growth stages of nitrogen, phosphorus and potassium requirements of the three countries, the results of research not only in terms of the number is quite inconsistent, that is, the absolute amount of absorption in each period as a percentage of the total, the difference is obvious. According to the research of Hebei Agricultural Research Institute, the percentage of the total N, P and K uptake to the total amount of absorption was 10.74, 5.80, 8.11 respectively from budding to budding stage; the budding to flowering stage was 52.16, 28.80, 17.28; Maturity of 35.5,65.4,80.6. Protopusu Soviet Union study: the proportion of nitrogen, phosphorus and potassium absorbed in the emergence to the budding period accounted for the total amount of force 8.3,8.1,10.1; budding to boll forming period of 59.6,58.3,63.5; boll formation to the end of production 31.1,33.6,26.4. White’s years of research: the percentage of total N, P, K uptake to the buds of early pregnancy was 34, 37 and 35, respectively; To the beginning of bolting 18,18,13;