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Solar greenhouse tomato healthy appearance judge
Tomatoes are one of the most cultivated vegetables in the solar greenhouse. According to the appearance of the tomato plant, judging the health status of the tomato and adjusting the cultivation measures accordingly can have a multiplier effect. First, to see the leaf phase 1, twisted leaves: greenhouse tomatoes set fruit after the fruit grows to the size of the walnut, the leaves close to the ear are severely distorted and deformed, showing fern leaf-like, after the fern-shaped leaves gradually open, growth is normal. After more than ten days, this phenomenon has appeared in the upper leaves. This situation has repeatedly occurred due to the use of 2,4-D flowers, and it has a certain relationship with greenhouse temperature. An effective method is to reduce the concentration of 2,4-D and manage the greenhouse temperature appropriately. 2, physiological leaf. Before or during the harvest of the tomato, the first fruiting branch leaves slightly, or the whole plant leaves become tube-shaped and becomes brittle, so that the fruit is directly exposed to sunlight, affecting the enlargement, or causing sunburn. This is a kind of physiological leaf, which is mainly related to soil, irrigation and management. As long as the soil moisture is suitable, the amount of fertilizer is appropriate in a timely manner, and the greenhouse can avoid sudden sudden release of wind, it can be reduced or avoided. 3, bleached leaves. The leaves are damaged. At the beginning, the chlorophylls fade or the leaves are bleached and later become yellow. Only the leaf margins are burn-like, heavy and half-leaved or entire leaves, eventually causing permanent wilting or desiccation. This symptom is mainly caused by high temperature disorders. Ventilation, cooling, and shading can reduce or avoid damage. 4, cotyledons on the move. The cotyledon was lifted, and the back surface of the leaf was rewinded. The leaf edge was gradually dry or the individual leaves were wilted and dry. The leaves were dark green, or the top bud growth point was frozen. Severe stems and leaves were dry and dead. This symptom is mainly caused by the cold temperature. When the seedlings are subjected to low-temperature exercise and the cold current is strengthened, the temperature and heat are strengthened, which helps the seedlings return to normal. 5, virus disease leaves. When tomato is infected with virus disease, there are mainly different manifestations such as mosaic type, fern leaf type and streak type in the early stage of disease. Sometimes the incidence of tomato virus disease is only 1 type, sometimes 2-3 species at the same time, greenhouse tomatoes mostly fern leaf type. Second, look at the flower phase 1, thin flowers. The tomato flower ear is small and the flowers are less, and the angle between the panicle and the main stem is obviously smaller than the normal panicle angle. The main reason is that the night temperature in the room after colonization is too high and the tomato root volume is small. In the case of pouring enough water for planting, diligently cultivating and loosening soil, reducing the greenhouse temperature at night, controlling the promotion, appropriate seedlings, flowering will be normal. Of course, slender florets also have a relationship with flower bud differentiation at seedling stage. 2, less buds. When the buds appeared, there were only 2-3 buds. After removing ghost flowers, only 1-2 were left. This condition is mainly due to the small temperature difference in the flower bud differentiation stage at the seedling stage, the high seedling density, the poor root development, and the formation of weak seedlings. During the nursery period, when the seedlings grow to 2 leaves and 1 heart, the seedlings should be separated in time, and the temperature difference should be widened to cultivate age-appropriate seedlings and normal buds. 3, ghost flowers. The first flower in the flower of each ear of a tomato is large and has many petals. The result is mostly malformed fruit. People often call this kind of flower a "ghost flower." Ghost flower is the performance of the normal growth of tomatoes, generally in the production of ghost flowers removed. Third, see the fruit phase 1, malformed fruit. There are many types of tomato misshapen fruit, such as pointed fruit, empty fruit, perforated fruit, split fruit, twin fruit, chrysanthemum fruit, elliptic fruit, and eccentric fruit. Spike fruit is due to the use of high hormone concentrations or repeated pharmacotherapy. Perforated fruit flower bud differentiation stage encountered low temperature and insufficient light. Formula fertilization is used to strengthen seedling management, strictly control the concentration of hormones used, and make indoor a suitable temperature and humidity conditions, in order to reduce the occurrence of teratogenic fruit. 2, brown fruit. The brown fruit matures and turns red, but brown or brownish brown is revealed on the red fruit surface, causing the fruit to be dirty and the gloss to be poor, which affects the appearance of the fruit. Physiological diseases, mostly in the partial application of nitrogen fertilizer, low temperature conditions occur. 3, green fruit. After the green cherries turn pink or red, green patches or green areas still remain near the shoulders or fruit peduncles. They remain unchanged and appear red and green, but the green areas are hardened, and the pulp is sour. decline. The main reason is that partial application of nitrogen fertilizer, lack of potassium fertilizer and boron, dry soil is also a cause. 4, brown fruit. Brown-brown fruit is actually a tendon rot. There are two types of brown and white variants, and there is less incidence of cultivars in winter in greenhouses. The rot disease is a physiological disease. The degree of damage depends on the species, light intensity, and the ratio of nitrogen, phosphorus, and potassium in the soil. The density of tomatoes in the greenhouse is too large, and the amount of air is small. Long-term foliation is also the cause. In short, if the technical management can meet the demand of tomato for water, fertilizer, gas, heat and light, it can reduce the influence of various unfavorable factors and make tomato grow healthily.