Notes on the use of vegetable foliage fertilizer
Take a look at the weather conditions. In order to improve the effect of foliar spraying, it is necessary to grasp the temperature, humidity and wind direction during spraying. Generally suitable temperature for spraying fertilizer is 20°C-28°C, and air humidity is 60%-70%. At this time, the stomata of the leaves of the vegetables are all open, and the leaves absorb nutrients more quickly. If the temperature is high and the humidity is low, the fertilizer solution is quickly evaporated on the leaves, which not only has poor absorption effect, but also easily causes the fertilizer to burn the leaves. Therefore, the foliar spray fertilizer should be sprayed after 7-10 am and 4 pm, and it is best to use no wind and cloudy spray. In addition, in the cold and rainy season, cold and heat fertilizers should be used, such as plant power 2003; hot and dry drought should be selected fertilizer spraying, such as Opal, plant amino acids, humic acid and other foliar fertilizers.
Second, look at the type of vegetables. Different types of vegetables require different fertilizer characteristics, such as leafy vegetables like nitrogen, beans like phosphorus, potassium, Chinese cabbage, broccoli, radish, etc. are more sensitive to boron, leguminous and cruciferous are more sensitive to molybdenum, fast-growing vegetables Need less fertilizer, continuous flowering results of vegetables need more fertilizer, yam vegetables, avoid chlorine, onion and garlic vegetables molybdenum and so on. Therefore, the application of foliar fertilizer to vegetables will vary according to different types, so that scientific selection of fertilizers will be beneficial to avoid disadvantages.
Three to see the growth period of vegetables. In different stages of growth and development of vegetables, there is a difference between the proportion of demand for nutrients and the demand. Generally, the seedling needs less fertilizer, and the flowering result requires a large amount of fertilizer. Therefore, when applying the foliar fertilizer, it should be done by spraying small amount of seedlings in the early stage to make up for nutrients and promote seedling growth. In the late growth period, more shoots will prevent premature aging and promote high yield. .
Four to see the growth of vegetables. The growth of vegetables is flourishing, and the fruits and fruits are strong, indicating that the supply of fertilizer and water is sufficient and the growth is good, and top dressing can be applied less; if there is yellowing, small fruit, serious diseases and insect pests, growth obstruction, growth potential difference, etc. Su, then should carefully find the reasons for the disease under the fertilizer, and timely replenishment of nutrients, such as tomato umbilical rot should consider the application of calcium fertilizer, cucumber appetite less melon, should control nitrogen phosphorus and potassium.
Five to see the leaf fertilizer varieties. At present, there are many types of foliar fertilizers on the market. Their chemical composition is different, their nature and uses vary, and the range of applicable vegetables is naturally different. It is necessary to understand in detail the characteristics of foliar fertilizers, specify the applicable scope, and accurately grasp the concentration and dosage of foliar fertilizers. Familiar with the dosing procedures, especially compounding, to prevent the inappropriate mix of fertilizers, to avoid reducing the effect of fertilizer and efficacy, and even fertilizer damage. Proficiency in spray techniques, generally 50-75 kilograms of fertilizer per acre, in order to make the stems and leaves of the vegetables (including the positive and negative sides) evenly liquid.
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