1. The concentration is suitable to receive good results. Generally speaking, the suitable spraying concentration of various trace element fertilizers is: boric acid or borax solution 0.05%~0.20%, ammonium molybdate solution 0.02%~0.05% The zinc sulfate solution is 0.05%~0.20%, the copper sulfate solution is 0.01%~0.02%, and the iron sulfate solution is 0.2%~1.0%.
2. The period of spraying the trace element fertilizer must be determined according to the variety of vegetables and different trace element fertilizers. It is generally suitable for spraying before flowering.
3. The amount of fertilization solution is 40 kg~75 kg, which can make the stems and leaves of vegetables wet.
4. The number of times of spraying on the leaf surface is generally less than the amount of fertilizer used, so it is difficult to meet the needs of all growth and development processes once. According to the length of the vegetable growth period, it is generally appropriate to spray 2 to 4 times.
5. Time should be selected from the afternoon or evening when it is cloudy or sunny, which can prolong the residence time of the fertilizer solution on the vegetable leaves, which is beneficial to improve the spraying effect.
6. Mixed spraying with micro-element fertilizer, or mixed with other fertilizers and pesticides, can save the process and play the role of “one spray and multiple effectsâ€. However, all kinds of trace element fertilizers should not be mixed with alkaline fertilizers such as grass ash and lime. Zinc fertilizer should not be mixed with superphosphate. Copper fertilizer should not be mixed with potassium dihydrogen phosphate solution. (Peasant Daily)
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96 Well PCR Plates
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