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云南省以前通常采用烧火土苗床育苗法。此法需铲大量草皮笙,砍伐许多荆棘灌木或树枝等作烧火土材料,既浪费大批劳动力,又严重破坏了山林草地的水土保持,至使不少社队只好缩减苗床面积,扩大大田与苗床比例。结果既育不出壮苗,影响了移栽成活率,大田烟株也达不到整齐一致。为了改变这一状况,云南省大理州经济作物研究所进行了烤烟无火土育苗法的试验。苗床地用烧火土主要有增加磷钾肥料、防治病虫害以及改善土壤透气性等作用。该所据此首先选择了危害烟苗病虫较少的水稻田作苗床
In Yunnan Province, burned fire seedbed nursery method was used before. This law requires a large number of turf shovel cutting, cutting many thorns shrubs or branches for burning fire soil material, not only a waste of a large number of labor, but also seriously damaged the soil and water conservation of forest and grass, so that many communes had to reduce the area of seedbed expansion of field and seedbed proportion. Results not only not strong seedlings, affecting the survival rate of transplanting, tobacco plants in the field can not reach the same neat. In order to change this situation, the Dali Prefecture Institute of Economic Crops conducted experiments on flue-cured tobacco without soil. Seedbed with burning soil mainly phosphorus and potassium fertilizer to increase, control pests and diseases and improve soil permeability and so on. According to this, the first selected rice seedlings endangering the pests and diseases less seedling beds