摘要
在旱棚控制供水条件下,对丘陵半干旱区氮(N)、磷(P)、水(W)及其耦合作用的产量效应进行了3年定位试验.结果表明,供水不足时,水分是影响春小麦产量的主导因素;而供水充足时,N肥对产量的影响作用更敏感.N、P、W3个单因素对春小麦均有明显的增产作用,而且符合报酬递减率.N、W之间存在正耦合效应,供水不足时,过多施用N肥易加剧作物的干旱胁迫作用;N、P之间表现为负交互效应,低P高N同样能取得较高产量;P、W之间表现为负交互作用,缺水时增施P肥可提高春小麦的抗旱能力.通过计算机模拟寻优,得出了丘陵半干旱区春小麦水肥管理优化方案.
To study the effect of N(nitrogen), P(phosphorus), W(water) and their interaction on the spring wheat yield in hilly semiarid area , a site experiment was conducted in rainshelter from 1997 to 1999. Results showed that as water supply was insufficient, water was the most important factor affecting the yield, whereas N was the most sensitive to yield in three factors when water supply was sufficient. The each single effect of N, P and W on yield increasing was statistically significant and coincided with the law of diminishing return. The positive interaction existed between N and W, and excessive N was prone to crop drought stress for the lack of water shortage. Negative interaction existed between N and P, and combination of low P with high N could also achieve higher yield. The negative interaction between P and W indicated that increasing P could enhance crop droughtresistant ability under the condition of water shortage. In accordance with spring wheat models, an optimum management of water and fertilizer was put forward by computer simulation optimizing .
出处
《华南农业大学学报》
CAS
CSCD
北大核心
2003年第1期8-12,共5页
Journal of South China Agricultural University
基金
国家"九五"重点科技攻关资助项目(96 004 04 06)
关键词
水肥耦合
丘陵半干旱区
褐土
春小麦
产量
水肥管理
water-fertilizer interaction
hilly semiarid area
cinnamon soil
spring wheat
yield
