Solar greenhouses, greenhouses, and various forms of small and medium arch shelters and other protective ground facilities do not basically warm, and heat mainly comes from sunlight. Therefore, due to the large influence of the external environment, the ability to withstand adverse natural conditions is poor. In winter and spring, the ambient temperature is low, and the light is weak. The production of protective plants in the winter and spring protected areas will have a very negative impact on the tomatoes. The occurrence of severe raining, fruiting and malformation will occur especially in the continuous rainy days. problem. In order to overcome this unfavorable influence and reduce the losses caused by this, it is necessary to strengthen the management of seedlings and cultivate strong, strong, strong and resilient seedlings. This is the key to ensure the early maturing, high yield, high quality and high efficiency of tomato production in protected areas.

First, varieties should be selected for low temperature resistance, low light, leaf volume, plant type compact, dark green leaves, more upright protected species dedicated to growing. Because the humidity in the protected area is relatively large, it is easy to cause the occurrence and spread of fungal diseases. Therefore, the selected varieties require certain resistance to major diseases in the protected areas such as leaf mold, early blight, and late blight. At present, Jiahe No. 15, Jiafen No. 17 and Zhongza No. 9 which are relatively good in production are reflected.

Second, the strong seedling standard seedlings standard: with 7-9 true leaves, seedling height 20-25 cm, stem thicker than 0.5 cm, uniform thickness up and down, short internodes, dark green leaves, leaves carried out, hypertrophy and with large Bud, seedlings capable of flowering 7-10 days after colonization.

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