Rape seedlings must be grown in the field for about 35 days. In order to ensure the coordinated growth of individuals and groups, the seedlings and the seedlings must be timely and timely. (1) Early seedlings. 1 leaf 1 heart, must be the first time the seedlings to improve the individual's growth environment, to promote the seedlings robust growth; (2) split seedlings. After the cotyledon seedlings are grown, the first time the seedlings are planted, and the trees are required to be singled and the seedlings are not to be seeded; after the two leaves are grown, the second time the seedlings are planted, and the leaves are not touched; the third leaf is born; The third time the seedlings were planted, and the density of seedlings was determined according to different ages and varieties. Generally, the density of seedlings was about 13 to 15 plants per square foot for about 35 days, and (3) the quality of the seedlings was adhered to. In the process of splitting seedlings and seedlings, we must adhere to the principle of "four visits and four stays," that is, we must stay weak, stay strong, stay sparsely alive, go to the sick, stay healthy, and stay small. Pull out the long-necked seedlings, clustered seedlings, fall pit seedlings, leafless seedlings, high-ill seedlings, diseased leaf seedlings, insects and seedlings; left short-necked seedlings, leafy seedlings, collapsed seedlings, strong growth strong seedlings
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