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施用石灰能促进红壤油菜的生育,增加油莱对P、K和Ca的吸收。这主要归因于施用石灰后交换性铝的降低和Ca、Mg数量的增加.施用石灰和加喷施硼肥,每亩增产油菜籽分别为9.6～31.1公斤和17.6～26.3公斤,增产幅度分别为15.9～41.3％和19.8～35.2％,施用石灰使菌核病发病率和病情指数下降2.4～15.4和2.0～11.4.在施用石灰的条件下施硼,油菜增产效应更为明显。要使红壤油菜获得最高产量,必须使pH提高到6.5以上,铝饱和度下降到4％以下.
The application of lime can promote the growth of red soil rape and increase oil absorption of P, K and Ca. This is mainly attributed to the decrease of exchangeable aluminum and the increase of the amount of Ca and Mg after the application of lime, and the increase of rapeseed yield per mu was 9.6-31.1 kg and 17.6-26.3 kg respectively, 15.9 ~ 41.3% and 19.8 ~ 35.2%, respectively, and the incidence and the disease index of sclerotinia decreased by 2.4 ~ 15.4 and 2.0 ~ 11.4, respectively.During the application of lime, the effect of yield increase was more obvious. To obtain the highest yield of red soil rape, the pH must be raised above 6.5 and the aluminum saturation below 4%.