二）定植前幼苗的处理。起苗前１天苗床要浇透水，以利起苗，尽量减少拔苗时损伤根系。起苗后用生根剂稀释液沾根，促进早发根和提高成活率（生根剂也可用于移栽后灌根）。（三）淘汰弱小杂株苗和病苗。这是在种子有一定纯度的前提下，进一步提高大田纯度的重要环节。杂株... B) Pre-planting seedlings. 1 day before the seedling seedlings to be drenched water, to benefit from seedlings, try to reduce the damage to the roots when pulling seedlings. After starting the seedling with rooting agent dilution root, promote early hair root and improve the survival rate (rooting agent can also be used after transplanting irrigation root). (C) out of the weak hybrid seedlings and disease vaccine. This is an important part of further improving the purity of the field under the premise that the seeds have a certain degree of purity. Miscellaneous ...