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张洪志同志:你来信询问老根菠菜死苗的原因和预防措施,现请春阳同志予以答复。老根菠菜在我省各地每年都有不同程度的死苗现象。主要原因是早春菠菜返青阶段,土壤表层(根系分布
Comrade Zhang Hongzhi: You asked for the reasons and preventive measures for the death of spinach from Laogan. Now please reply from Comrade Chun Yang. Laogen spinach in our province throughout the year have varying degrees of dead seedlings phenomenon. The main reason is early spring spinach rejuvenation stage, the soil surface (root distribution