“大豆掐尖(摘心)能增产”是五十年代以来比较流行的观点。近几年来,一些大豆摘心试验研究表明,在不同的大豆品种上,在不同的栽培条件下或者在同一品种的不同生育时期摘心,效果各不相同。本项试验是在1982和1983年在肥力中等的草甸棕壤土上进行的。供试品种有分枝性有限型的铁丰18号和分枝性亚有限型的辽豆3号。试验共分4叶期,9叶期摘心和不摘心(对 “Soybean pinch point (topping) to increase production” is the more popular since the 1950s point of view. In recent years, some soybean topping studies have shown that there are different effects on different soybean cultivars under different cultivation conditions or at different growth stages of the same species. This test was conducted on fertile brown meadow soil in 1982 and 1983. The test varieties are branched limited type Tiefeng 18 and branched sub-limited type Liao bean 3. The experiment is divided into 4 leaf stage, 9 leaf stage topping and not topping (right