With proposed reasonable and efficient algorithm, all intersted P-K point in a fixed state space range can be obtained.
以所建议的算法，可以有效地在规定相空间范围内找到各种P—K解；
2
By using "3414" fertilizer experiment method, the contents of n, p, K and yield of onion in Gaoqiao area were comprehensively analyzed.
试验采用二次回归“3414”完全方案设计，对高桥地区圆葱植株的氮、磷、钾含量及产量进行了分析。
3
Higher efficiency of nutrient acquisition of root in heterogeneous nutrient environment mainly attributed to large absorption of n, p, K in rich nutrient patch.