Effect of Fertilization Technology on Vegetable Quality
(1) Effect of Fertilizer Amount on Vegetable Quality: It is evident in various fertilizer applications. Through research and practice. Its purpose is to seek the best quality or high-quality fertilization.
(2) The effect of basal fertilizer on the quality of vegetables: Phosphorus and potassium fertilizers are mostly applied as base fertilizers in vegetable production, nitrogen fertilizers are used in multiple batches, and compound (mixed) fertilizers, especially granular compound fertilizers, are often applied once more. Studies have shown that the application of granular special fertilizers for vegetables at one time not only increases the yield of farmhouse fertilizers, but also improves the appearance quality and nutritional quality of vegetables in varying degrees.
(3) The effect of the combination of basal fertilizer and topdressing on the quality of vegetables: The use of nitrogen fertilizers as base fertilizers and top dressings is a high-yield fertilization method commonly used in vegetable production in recent years. Different proportions of nitrogen fertilizer as base fertilizer and top dressing have different effects on carbon and nitrogen metabolism and nutrient quality formation in vegetables.
(4) The effect of top dressing fertilizer on the quality of vegetables: Top dressing is based on the absorption of nutrients in the leaves, stems, flowers, young fruits and other organs (mainly leaves) of the vegetable shoots, so as to nourish its own special fertilization method. Although, on the whole, the contribution of top-dressing fertilizers to vegetable nutrition is supplementary, and it is limited by weather conditions, types of vegetables, fertilizer characteristics, and other conditions, it has certain limitations. However, the nutrients provided by top dressings to vegetables are provided. It has the characteristics of directness, rapidity, and high efficiency, so under certain special conditions or during a certain period of vegetable growth, top-dressing outside the root can regulate the stock-source relationship by affecting the nutrient metabolism of vegetables, thereby regulating and controlling vegetable yield. The purpose of quality.
1 outside dressing type. At present, there are a wide variety of fertilizers that are used as top-dressing fertilizers at home and abroad. The types of fertilizers vary widely. From the perspective of the substances used, they can be classified as nutritional (including macronutrients, trace elements), hormones (growth regulators, humic acids, etc.) and Integrated types (inorganic and organic nutrients, growth regulators, pesticides, microbial agents, enzyme preparations, antibiotics, etc.) have become leading products in an integrated manner. From the perspective of effects, they can be divided into general-purpose and special-purpose types; from the aspect of fertilizer formulations, they can be divided into solid and liquid foliar fertilizers. Regardless of the type of foliar fertilizer, the impact on the quality of the vegetables is possible. It depends on the time, method, fertilizer type, and application amount (concentration, number of times, etc.) of top dressing.
2 Effect of top dressing fertilizer on the quality of vegetables. In order to obtain excellent quality of vegetable products, it is very important to grasp the effective period of top dressing. Because of the different types and varieties of vegetables, the purpose of the cultivation (or the organs of the harvest) is different, and the period of top dressing outside the root should also be different. According to the study on the chemical regulation of nitrate in leafy vegetables, the effects of GA3 and molybdenum fertilizers applied on the yield and quality of Chinese cabbage and lettuce during different periods were best. The four-leaf Chinese cabbage and lettuce-leaf 9-leaf were the best. GA3 (G2) and molybdenum (M2) were sprayed at the 4-leaf stage of pakchoi, and the nitrate content was significantly reduced in both greenhouse and room temperature cultivation. The contents of Vc and amino acids in greenhouse cultivation were significantly increased. When two compounds were sprayed at the 9-leaf stage of lettuce, the nitrate content in the stem and leaf was greatly reduced. Spraying molybdenum fertilizer significantly increased the Vc content in stems and leaves.
3 The effect of top dressing techniques on the quality of vegetables. The types, proportions, concentrations, times and methods of foliar spray fertilizer application all affect the quality of vegetables.
Foliar fertilization is a fast and efficient fertilization method to supplement the nutritional deficiency of vegetables. Different levels of soil fertility will inevitably affect the quality effect of foliar fertilization. According to the study, in the soil with high nitrogen levels, there was a difference but not significant in the protein content between the foliar application of nitrogen fertilizer and the control, while the difference between the nitrogen spraying and the control in the nitrogen and low nitrogen conditions was extremely significant. Level. It can be concluded that adequate root nitrogen fertilizer application plays an important role in improving the quality of vegetables in low-fertility soils.
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