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选择四面环山的村队作为制种基地。对时出基地的路口,自制种区边缘向外垂直距离1000m范围,禁止种植非父本十字、花科作物。制种田选择土壤肥沃地力均匀且集中连片的田块。
Select the village team surrounded by mountains as seed production base. At the crossing of the base, the vertical distance of the edge of the self-made seedling area should be within 1000m, prohibiting the cultivation of non-paternal cross and flower crops. The system of farming choose fertile soil fertility uniform and concentrated contiguous plots.