Actress is a common physiological obstacle in the growing period of vegetable seedlings. Its characteristics are: thin stems, long internodes, thin leaves, light green leaves, soft tissue, underdeveloped roots; slow seedlings after planting, low survival rate, late and abnormal flower bud differentiation, small number of flower buds, abnormal flowers and More weak flowers, easy to fall off, it is difficult to get precocious, high yield.
Management measures: 1. Prevention, mainly to increase light and control seedbed temperature. When seedlings grow congested, and when they are seedlings and seedlings. In the late stage of seedlings, the row spacing can be expanded to prevent excessive shading. Try to increase the light, even in cold weather, but also to properly open the cover, so that the seedlings see the light; when the exposed temperature is appropriate, remove all the cover, so that the seedlings fully receive light. The seedbed temperature should be strictly controlled according to the needs of the seedlings in various stages of growth and development. 2. Remedy, mainly control watering, spray phosphorus, potash fertilizer or use plant growth regulators to inhibit growth.
When the growth and development of young seedlings are inhibited, it is easy to form a "stuck seedling." Its characteristics are: dwarf seedlings, thin stems, small leaves, less roots, new roots are not easy to occur, flower buds are not normal, easy to drop flowers, slow seedlings after planting slow. The reasons for rigidification of seedlings are mainly due to the long seedling age, long-term low temperature and drought in seedbeds.
Management measures: 1. Change control seedlings to promote seedlings. Give seedlings suitable temperature and moisture conditions to promote rapid seedling growth. Practices in various places have proved that under the conditions of artificial temperature-controlled seedlings (such as industrialized seedlings, electric hotbed seedlings, etc.), there are very few emergent seedlings. 2. When using cold-bed nursery, try to increase the temperature and ground temperature of the seedbed, and properly water the seedlings.
The occurrence of frost damage is often the main reason for the failure of nursery. After the seedlings were frozen, the leaves and stems showed dark water stains and died slowly. When the seedlings were only lightly frozen, the external morphological changes were not significant, but the physiological function had been significantly reduced, not only seriously affecting seedling growth. It also affects the differentiation and development of flower buds, which can easily cause loss of fruit or deformity.
Management measures: 1. Improve the means of raising seedlings, artificial temperature control seedlings, such as electric hotbed nursery, factory nursery and so on. 2. Keep warm and prevent freezing. During early spring nursery, pay attention to listening to the weather forecast, observe weather changes, and take cold and warm measures in time; at the time of cold wave invasion and low temperature, cover the original cover tightly, press it well, and if necessary, add a layer of grasshoppers. Armpit hair and other things, and keep it as dry as possible to prevent it from being wetted by rain and snow. 3. Strengthen management, increase lighting properly, promote photosynthesis and nutrient accumulation are important measures to improve the cold resistance of seedlings. In addition, proper control of watering, reasonable application of phosphorus, potash, etc., can also improve the cold resistance of seedlings.
Prevent seedlings from “dryingâ€
Under normal circumstances, seedlings grow in the environment with high humidity and transpiration is weak. Once they are hit by strong winds, the sudden increase in transpiration will destroy the water balance between the original root absorption and transpiration, so that the tender leaves If there is too much water loss, it will not be able to replenish with timely wilting; if the wilting time is too long, the leaves will not be able to recover, and it will finally dry out in a green manner. This phenomenon is called "drying."
Its management strategy is: seedbed ventilation from small to large, do not rush too fast, so that the seedlings have a process of adaptation; there is windy weather, the pressure of the cover is good, to prevent being run away by the wind.
The emergence of roots, roots, and roots in seedlings is a physiological obstacle caused by excessive humidity and low temperatures in the seedlings, especially in the cold, snow and snow (rain) weather that is affected by cold currents. Gas, easy to occur when seedlings grow weak. It usually appears as brown rust on the roots, slow growth and even stop on the ground, and the leaves are grayish green and gradually yellow.
Management countermeasures: It mainly controls watering. When the seedbed is in arid state, it is divided into pieces according to the needs of the water to prevent flooding. In the event of rooting, timely ventilation and dehumidification, dry soil (or grass ash) may be used to absorb moisture, or more loose soil may increase soil evaporation.
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