论文部分内容阅读
在旱棚控制条件下，用三因素五水平回归设计，研究了渭北东部旱塬氮磷水三因素的交互作用及耦合模型，结果表明：①氮、磷、水对冬小麦的增产顺序为水＞氮＞磷；②氮磷和氮水的交互作用为协同作用型，氮、磷、水都为李比希限制因素；磷、水交互作用为拮抗型，磷、水为拮抗限制因素；当氮、磷、水同时投入时，磷水拮抗型转变为协同作用型，磷、水也变为李比希限制因素；③水分对目标产量的校正模型为：ｙ＝－３０．６５２±０．９９６６Ｗ＿Ｂ，ｙ＝－１６．５０２＋０．８７５Ｗ＿Ｒ，ｙ＝－１１３．２９７５＋０．６０４１Ｗ＿Ｔ；④水分对施肥量的校正模型为：Ｘ＿１（Ｎ）＝０．７９５６＋０．４７２８Ｘ＿３，Ｘ＿２（Ｐ＿２Ｏ＿５）＝０．４６７９＋０．２１６９Ｘ＿３。
Under the control of upstairs canopy, the interaction and coupling model of three factors and five factors on the upriver in the north of Weibei were studied using three factors and five levels of regression. The results showed that: ① The order of increasing yield of nitrogen, phosphorus and water to winter wheat was water > Nitrogen> phosphorus; ②The interaction of nitrogen and phosphorus and nitrogen water is a synergistic type, nitrogen, phosphorus and water are Li Bixi limiting factors; phosphorus and water interaction antagonistic, phosphorus and water as antagonistic limiting factors; when nitrogen, Phosphorus and water also turned into synergistic type, phosphorus and water also became the limiting factor when the phosphorus and water were put into operation simultaneously. ③ The calibration model of water to target yield was: y = -30.652 ± 0.9966W_B, y = -16.502 + 0.875W_R and y = -113.2975 + 0.6041W_T. (4) The correction model of water content for fertilization was: X_1 (N) = 0.7956 + 0.4728X_3, X_2 (P_2O_5) = 0.4679 + 0.2169X_3.