许多文献记载油菜地是个好茬口,油菜有肥地作用。我们于1977—78年观察到在同一地块播种的油菜茬玉米不如同期播种的冬闲地的玉米。因而对文献记载引起了怀疑。为了搞清底细,我们于1981—82年进行了土培盆裁试验。设计和管理:试验设小麦、油菜、豌豆、箭筈豌豆、启东毛苕子和扁荚山黧豆各三盆,均为秋播。另设休闲三盆作对照。各处理于夏收后种植玉米,以休闲茬为对照,用生物学方法测定各茬地的肥力。 Many records of rapeseed is a good crop, rape has a fat effect. In 1977-78, we observed that corn planted in the same plot was not as good as maize in the fallow fields sown in the same period. Thus the literature has caused suspicion. In order to find out exactly what we did, we conducted a pot experiment in 1981-82. Design and Management: The experimental set wheat, rape, peas, arrowhead peas, Qidong hair prickly heat and flat pods mountain beans three each pot, are autumn. Another set of leisure three pots as a control. All treatments were planted corn after summer harvest to leisure stubble as a control, using the biological method to determine the fertility of each stubble.