摘要
本研究以作物能够吸收的有效养分为基础，根据作物生长的养分吸收量计算单位播种面积上农作物的养分需要量，逐一差减土壤和有机肥提供的养分量，求出单位播种面积上农作物对化肥养分的需要量。在广泛查阅和搜集前人试验资料的基础上，对搜集到的原始数据进行认真的分析、整理，然后采用计算机模拟方法进行预测。预测结果指出，２０００年农用化肥氮磷钾的消费比例为１∶０．３８∶０．２５。
Based on the mass balance of available nutrients and the all experimental results published later after 1980, the present study simulated nutrient uptake, and nutrient supplies from soils, applied chemical fertilizers and manures in the whole China; and then predicted the optimal ratios of N, P, K fertilizers required for crop production in the country. It is predicted that the optimal ratios of N∶P 2O 5∶K 2O would be 1:0.38:0.25 for N, P, K fertilizers in the year of 2000. It is indicated that chemical fertilizers and manures contributed 34% and 18% to the total crop N demand, 18% and 25% to the total crop P demand, 13% and 19% to the total crop K demand, respectively, while the other percentages were occupied by soil supplies. Manures which are traditionally employed as main fertilizers in China supplied a large quantities of nutrients, especially K and P, to crop production. Therefore, the application of manures had great effects on the prediction of demands and ratios of chemical fertilizers although little attention on this disturbance has been paid to the prediction of fertilizer demands until now.
出处
《地理学报》
EI
CSSCI
CSCD
北大核心
1998年第1期32-41,共10页
Acta Geographica Sinica
基金
国家计划委员会专项研究课题
关键词
中国
农用化肥
氮肥
磷肥
钾肥
需求比例
requirement of chemical fertilizer, crop production, manure, soil nutrient supply, available nutrients, simulation model
