Techniques for preventing overgrowth of Tomato in greenhouse

The main reasons for the phenomenon of growing seedlings and stiff seedlings in greenhouse tomato planting are lack of light, too high temperature and too much moisture. There is more harm after the seedlings grow or are stiff. The flower bud differentiation of growing seedlings is late, there are many fallen flowers, and the survival rate is low, which will greatly reduce the yield, but can not achieve precocious maturity. The main measures to prevent the overgrowth of seedlings are to increase the light and reduce the temperature, and to properly control moisture. When the seedling growth is dense, the seedlings should be divided in time, and the plant row spacing can be enlarged in the later stage to prevent excessive shading. In the cold weather, the mulch should be lifted properly so that the seedlings can see the light. When the external temperature is suitable, the mulch should be completely removed to make the seedlings fully receive the light. The temperature conditions should be managed strictly according to the temperature needed in each stage of the seedling, and the temperature should be ventilated and cooled in time. When the growth and development of seedlings is inhibited, rigid seedlings often appear. The characteristics of rigid seedlings are: short seedlings, straight stems, small leaves, not easy to develop new roots, abnormal flower bud differentiation, easy to drop flowers and fruits, slow seedlings after planting. Seedling rigidity often occurs in cold bed, mainly because the seedling age is too long and the seedling is in low temperature and drought for a long time. Measures to prevent seedling rigidity: first of all, it is necessary to change the control seedling to promote seedling, give the seedling with suitable temperature and water conditions, and promote the rapid growth of seedling. Practice has proved that there is little ossification of seedlings by using control measures such as factory seedling raising and electric hotbed seedling raising. Secondly, when raising seedlings in a cold bed, raise the temperature and low temperature of the seedling bed as much as possible and water properly, so as not to control fertilizer and water excessively; for seedlings with ossification, measures such as raising bed temperature and proper watering can be taken.