How to Dress Fertilizer in Greenhouse Tomato During Fertility

Tomatoes are vegetables that require more water for fertilizers. "Dredge foot water", "fit fertilizer suitable water" to get high quality and high yield. Topdressing is mainly the use of quick-acting fertilizers to supplement the deficiency of basal fertilizer to meet the nutritional needs of tomato at different growth stages. Therefore, top-dressing must pay attention to the type and quantity of fertilizers and the time for top-dressing. It is necessary to “appropriate the appropriate amount” and “increase in time,” and to “apply the thin-fat fertilizer. If fertilizer is applied too early and too much, it will not only be easy to lose and waste, but also it will become a state that cannot be given, causing plants to fall and fruit. If fertilizer is too late, fertilizer efficiency can not be fully exerted. In particular, it should be noted that one-time fertilization should not be excessive, as this would result in too high a concentration of the soil solution, causing extravasation of tomato root fluid. In addition, topdressing requires the combined application of nitrogen, phosphorus, and potassium. Excessive partial application of nitrogen fertilizer will lead to plant growth and flowering, and appropriate application of phosphorus and potassium fertilizer will increase the growth and fruit development of tomato plants, and improve the yield and quality of tomato. The improvement has a great effect. The top dressing of tomatoes can generally be divided into 4 to 5 times. In the amount of fertilizer to grasp the "small, big middle", that is, the early, late, medium and more principles. The first top-dressing was carried out after the planting of the tomato, and this fertilization was called “raising seedlings”, mainly to promote the growth of the seedlings. Some nitrogenous fertilizer may be applied, but the amount of fertilizer should not be too large. Per acre can be applied thin human excrement 400kg, or urea 7.5-10kg. The second top dressing should be done after the tomato seedlings are finished. This fertilization can promote flowering and rapid fruit enlargement, promote early maturation and increase early yield. Requires application of nitrogen, phosphorus, potassium compound fertilizer, Mushi 10-15kg. The third top-dressing can be carried out when the first-order fruit is about to mature and the second and third-order fruits are successively enlarged. The most important fertilization this time, the amount of fertilizer should be increased. This period of "Fertilization of sufficient water" is very important for the consumption of basal supplements, promotion of fruit enlargement, and prevention of premature senescence. The fourth topdressing should be carried out when the second order fruit is about to mature, and the third and fourth order fruits are enlarged. This fertilization is mainly to promote the fruit ripening in the later period and increase the later yield. The fifth topdressing can be carried out when the third and fourth order fruits mature. It mainly promotes fruit ripening in the later period and reduces the number of non-commercial fruits. In tomato cultivation, late-stage de-fertilization is often encountered, resulting in a large number of angular and fruitless fruits, so that late-stage dressing cannot be ignored. In short, tomato can be used for 80-100kg of chemical fertilizers during the whole growth period, and requires nitrogen, phosphorus, and potassium fertilizers to be applied together. The fertilization amount should be increased during the period of vigorous growth of plants and the period of fruit enlargement. Early-maturing varieties should be appropriately advanced, while mid- and late-maturing varieties should pay attention to the top-dressing at the later stage to prevent premature aging. (Wang Yongzhen, Institute of Vegetables, Provincial Academy of Agricultural Sciences)

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