关中灌区间作套种的带型研究

在陕西关中平原较高水肥条件下,间作套种的产量、产值和产能分别比单作复种增加10—15%、14%和10%。间作套种,带型是关键。宽带型中有的无间套优势,有的优势甚小。模糊综合评判表明,窄带型中,小麦玉米两茬套种,2.5尺带较佳,小麦玉米和大豆三茬问套,3.5尺带最优。本文还讨论了影响小麦产量的边际效应,实播面积和玉米对带型反应的敏感性,以及间作大豆的光竞争等问题。

Studies on Strip Patterns of Relay--intercropping in the Irrigated Areas of Guanzhong Plain of Shannxi Province

Under the conditions of higher soil fertility and moisture in Guan- zhong Plain,the relay-intercropping productivity is much higher than that of the sequential cropping with its yields,productive value and productive energy increased by 10-15%.15% and 10% respectively. Strip patterns are the key link to the relay-intercropping.Some wide-strlp patterns may have no sequential cropping advantages but others have a few advantages.Results from Fuzzy Multi-factorial Eva- luation indicated that the relay-intercropping of wheat and corn with the strip of 2.5 chi was better and the relay-intercropping of wheat/ corn/soybean with the strip of 3.5 chi was the best in the narrow strip patterns. This paper deals with marginal effect,actual sown areas and width of empty bands affecting the yields of wheat.Also,this paper discusses the sensibility of corn responding to strip patterns and com- petition for light with soybeans in the relay-intercropping system,etc.