重庆紫苏子粒肥料运筹技术的数学模型研究

A Mathematic Model for the Fertilization Technique of Perilla frutescens (L) Britt in Chongqing

目的探索重庆地区紫苏规范化栽培施肥技术。方法采用三元二次正交旋转设计，研究紫苏栽培中N、P、K的施肥量，以期达到最优施肥配比。结果N、P、K三要素对紫苏产量的影响效果大小顺序为：K〉P〉N，高钾条件可以有效促进氮肥对紫苏产量的提高，而低钾条件下，高氮更容易对产量产生抑制效应。最优施肥方案为CO（NH2）2 13．74-18．58k·（667m^2）^-1，P2O5 6．40—7．96kg·（667m^2）^-1，K2O 2．81—3．80kg·（667m^2）^-1。结论合理施肥可以有效提高紫苏的产量，为紫苏的规范化栽培提供理论支持。

OBJECTIVE To explore a normalized fertilization technique for the Perilla frutescens （L） Britt in Chongqing. METHODS The quantities of N, P and K were studied to get the best ratio of fertilization by quadratic regression orthogonal rotation- al combing design with three factors. RESULTS The ranking of the effects of N, P, and K on the yield of Perilla was K 〉 P 〉 N. High quantity of K could improve the effect of N on the yield of Perilla, while in the condition of low quantity of K, high quantity of N tended to restrain the yield of Perilla. The best fertilization ratio was CO（ NH2 ）2 13.74 -18.58 kg · （667 m^2） ^-1, P2O5 6.40 -7.96 kg · （667 m^2） ^-1, and K2O 2. 81 -3.80 kg · （667 m^2） ^-1. CONCLUSION Rational ratio of fertilizers would increase the produc- tion of Perilla. This study provides the theoretical basis for standard cultivation of Perilla.