Vegetable spraying micro-fertilizer should grasp six points

First, the concentration of micro-fertilizer is suitable to receive good results, the concentration is too high, not only useless, but harmful. Generally, the suitable spraying concentration of various micro-fermentation concentrates is: boric acid or borax 0.05% to 0.25%, ammonium molybdate 0.02% to 0.05%, zinc sulfate 0.05% to 0.2%, copper sulfate 0.01% to 0.02%, manganese sulfate 0.05% to 0.1%, ferrous sulfate 0.5% to 1%, rare earth nitrate 0.03% to 0.1%, and rare earth animal and plant treasure 0.1% to 0.15%. If high concentration is required, it should not exceed 20% of the specified concentration.
Second, the period of spraying micro-fertilizer must be determined according to the difference of vegetable varieties and the use of micro-fertilizers. Generally, spraying from the seedling stage to the early flowering stage is appropriate. In order to reduce the loss of micro-fertilizer during spraying, it is best to spray on cloudy days to prolong the wetting time of the fertilizer concentrate on the stems and leaves of vegetables and enhance the fertilizer absorption effect of the plants.
Third, the amount of trace elements required for the use of vegetable crops is small, and the critical range of various trace elements from lack to excess is very narrow. A slight deficiency or excess can cause harm. Therefore, it should be applied strictly according to the standard amount. Increase or decrease the amount. Generally, the 667m2 fertilization solution is 40-75kg, so that the stems and leaves of the vegetables (including the reverse side) can be uniformly wetted to avoid repeated application. In addition, vegetables of different types and growth stages have different sensitivity to micro-fertilizers, and the amount of the vegetables is different, and should be applied according to their sensitivity to micro-fertilizers and plant growth conditions. Such as Chinese cabbage, rapeseed, cabbage, broccoli, alfalfa, lettuce, radish and other boron fertilizer demand; leguminous and cruciferous vegetables sensitive to molybdenum; beans, tomatoes, potatoes, onions and other sensitive to zinc fertilizer; pre-emergence Small leaflets can be sprayed less, and more growth is required during the prosperous period.
Fourth, the number of hand concentration and dosage restrictions, spraying once is not difficult to meet the needs of the entire growth process of vegetables. The number of spraying should be determined according to the length of the vegetable growth period (generally 2 to 4 times). Vegetables that are lacking and sensitive to soil should be sprayed several times, and combined with seed treatment (soaking, seed dressing) or base fertilizer application.
5. Reasonable spraying between mixed spray micro-fertilizers or mixed with other fertilizers or pesticides can play the role of “one spray and multiple effects”, but it is necessary to pay attention to clarify the physical and chemical properties of fertilizers and pesticides to prevent chemical reaction from decreasing. Fertilizer (drug) effect. All kinds of micro-fertilizers should not be mixed with alkaline fertilizers and alkaline pesticides. For example, all kinds of micro-fertilizers should not be mixed with alkaline fertilizers such as grass ash and lime; zinc fertilizer should not be mixed with superphosphate; copper fertilizer can not be combined with phosphoric acid Hydrogen potassium concentrated liquid mixed spray. Before mixing with pesticides, the micro-fertilizer and pesticide should be taken into the same container separately. If there is no turbidity, precipitation and bubbles, it means that it can be mixed, otherwise it can not be mixed. When the mixed sprayed concentrated liquid is configured, generally, a micro-fertilizer is firstly configured as an aqueous solution, and then other medicines and fertilizers are directly added to the configured micro-fertilizer solution according to the amount, and the mixed liquid should be sprayed with the distribution.
Sixth, the targeted application of micro-fertilizer should be applied to crops due to crops. For plots that have been continuously cropped for many years, attention should be paid to the manifestations of deficiency symptoms. For example, the water-soluble boron content in the soil is below 0.5 mg/kg, the effective molybdenum content is less than 0.2 mg/kg, the effective zinc content in the acidic soil is less than 1 mg/kg, and the effective zinc content in the calcareous soil is less than 0.5 mg/kg. , all need to be replenished in time.

Huaxian Agricultural University Liu Huimin
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