The main reasons for the emergence of shoots and stiff seedlings in tomato cultivation in greenhouses are insufficient light, excessive temperature and excessive moisture. There are more hazards after the seedlings grow in length or with stiff seedlings. Appetite buds differentiated lately, had more flowers, and had a low survival rate, which would significantly reduce production, but could not achieve early maturation.
Measures to prevent leggy seedlings are mainly to enhance light and reduce temperature, and to properly control moisture. When the seedlings grow densely, the seedlings should be divided in time, and the spacing of the seedlings can be expanded at the later stage of breeding to prevent overshadowing. In cold and cold weather, the cover must be properly opened to allow the seedlings to see the light. When the outside temperature is suitable, the cover must be completely removed to allow the seedlings to fully receive the light. For temperature conditions, the temperature required for each stage of the seedlings must be strictly managed, and ventilation should be conducted in a timely manner.
When the growth and development of seedlings are inhibited, they often appear to be seedlings. The characteristics of the stiff seedlings are: Dwarfling, straight stems, small leaves, and not easy to develop new roots. Flower bud differentiation is not easy to drop flowers and fruit, slow seedlings after planting. Seedlings in the cold bed often appear rigid seedlings, mainly due to the long seedlings, seedlings long-term low temperature, drought conditions.
Measures to prevent rigidification of seedlings: First of all, it is necessary to change the control of seedlings to promote seedling growth, and to give seedlings suitable temperature and moisture conditions to promote the rapid growth of seedlings. Practice has proved that the use of industrialized seedlings, electric hotbed nursery and other control measures to raise seedlings, there are few rigid seedlings. Followed by the use of cold bed nursery, as far as possible to improve the temperature and low temperature of the seedbed and appropriate watering, not excessive control of fertilizer control of water; for the emergence of the phenomenon of rigid seedlings, can be taken to improve the bed temperature, appropriate watering and other measures.
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