植物营养与肥料学报2012，Vol.18Issue(4)：803-812,10.
小麦/玉米/大豆和小麦/玉米/甘薯套作体系中玉米产量及养分吸收的差异
Study on yield and differences of nutrient absorptions of maize in wheat/maize/soybean and wheat/maize/sweet potato relay intercropping systems
摘要
Abstract
To analyze and compare the differences of maize yields, nutrient absorptions and soil nutrients of the cultivated layers between the intercropping systems, wheat/maize/soybean and wheat/maize/sweet potato, a threeyear field experiment designed with single-factor at random was conducted in two main maize producing areas in Siehuan, Shehong in the middle and Ya＇ an in the west. The results show that after one-year planting in the intercropping systems, the maize yields of the wheat/maize/soybean are higher than those of the wheat/maize/sweet potato ; however, the differences are not significant. After two or three-year＇ s strip rotation, the maize yields of the wheat/maize/soybean are considerably higher than those of the wheat/maize/sweet potato. The two year＇ s productions are more than those of the previous year with 679.5 kg/ha and 839. 1 kg/ha on average and with the increases of 9.4% and 12.6% in the two study areas, which reflects a more significant productivity in Shehong than that in Ya＇ an. In general, the uptakes and accumulations of nitrogen of maize are insignificant in the two intercropping systems after the strip rotation before the jointing stage of maize; however, they are significantly higher in the wheat/maize/soybean after the jointing stage of maize. The uptakes and accumulations of phosphorus in the wheat/maize/soybean are lower than those in the wheat/maize/sweet potato significantly, while, the uptakes and accumulations of potassium in the wheat/maize/soybean are higher than those in the wheat/maize/sweet potato from the jointing stage to the flowering stage. The contents of soil nutrients in different crop strips are varied greatly. The residuals of nitrate nitrogen, available nitrogen and available potassium in the soybean strip are higher than those in the sweet potato strip, with increases of 18.4%, 24. 1% and 6.0%; however, the residuals of ammonium nitrogen and available phosphorus in the sweet potato strip are higher than those in the soybean strip, with increases of 18.9% and 17.1%. The contents of soil nutrients in the maize three-year＇ s strip rotation, and the differences of soil nutrients in cultivated indicates that maize can balance the field nutrients better by the strip rotation. strip are insignificant after two and soil layers become small, which indicates that maize can balance the field nutrients better by the strip rotation.关键词
小麦/玉米/大豆（甘薯）/玉米/产量/养分吸收Key words
wheat/maize/soybean ( sweet potato)/maize/yield/nutrient absorption分类
农业科技引用本文复制引用
王小春,杨文钰,任万军,邓小燕,张群,向达兵,雍太文..小麦/玉米/大豆和小麦/玉米/甘薯套作体系中玉米产量及养分吸收的差异[J].植物营养与肥料学报,2012,18(4):803-812,10.基金项目
国家公益性行业（农业）科研专项 （）
国家重点基础研究发展计划“973计划”项目 （）
国家大豆产业技术体系专项（CARS-04-PS19）资助. （）
