First, the concentration
It is good to receive a good concentration of micro-fertilizer to receive good results. If the concentration is too high, it will not be beneficial, but it will be harmful. Generally, the suitable spraying concentration of various micro-fertilizer solutions 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 %～0.1%, ferrous sulfate 0.5%～1%, rare earth nitrate 0.03%～0.1%, rare earth moving planting treasure 0.1%～0.15%. If high concentration is required, it should not exceed 20% of the specified concentration.
Second, the period
The period of spraying micro-fertilizer must be determined according to the difference of vegetable varieties and the use of micro-fertilizer, and it is generally appropriate to spray before the seedling stage to the initial flowering stage. In order to reduce the loss of micro-fertilizer during spraying, it is best to spray on cloudy days. On sunny days, it should be sprayed in the afternoon to evening to maximize the wetting time of fertilizer solution on the stems and leaves of vegetables and enhance the plant's The effect of absorption.
Third, the amount
The amount of trace elements required for vegetable crops is very small, and the critical range of various trace elements from lack to excess is very narrow. A slight deficiency or excess may cause harm. Therefore, it should be applied strictly according to the standard amount, and should not be arbitrarily increased or Reduce 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. For example, Chinese cabbage, rapeseed, kale, broccoli, turnip, lettuce, radish, etc. have a large demand for boron fertilizer; legumes and cruciferous vegetables are sensitive to molybdenum; beans, tomatoes, potatoes, onions, etc. are sensitive to zinc fertilizer; In the early stage, the small leaves of the seedlings can be sprayed less, and the growth period requires more spraying.
Fourth, the number of times
Due to the limitation of concentration and dosage, it is difficult to meet the needs of the whole growth process of vegetables by spraying a micro-fertilizer. 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.
Five, mixed spray
Reasonable mixing and spraying between micro-fertilizers, or mixed with other fertilizers or pesticides, can play the role of “one spray and multiple effectsâ€, but it is necessary to pay attention to clarify the physical and chemical properties of fertilizers and pesticides, and prevent chemical reactions from reducing fertilizers. )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 Mixture of hydrogen and potassium solutions. Before mixing with pesticides, a small amount of micro-fertilizer and pesticide should be placed in 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 preparing the mixed spraying solution, generally, a micro-fertilizer is first formulated into an aqueous solution, and then other medicines and fertilizers are directly added to the prepared micro-fertilizer solution according to the dosage, and the mixed liquid should be sprayed with the accompanying solution.
Sixth, to be targeted
Spraying micro-fertilizers requires the application of 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.
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