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 f...
| 
推荐 
点击下列相关研究机构和相关文献作者，可以直接查到这些机构和作者被《中国知识资源总库》收录的其它文献，使您全面了解该机构和该作者的研究动态和历史。
