Fertilizer varieties should be suitable for urea, potassium dihydrogen phosphate, superphosphate, potassium sulphate, leaching of plant ash, and some trace fertilizers, etc. It is preferable to use fertilizers for extra-root fertilizers, and chlorine-containing, volatile and insoluble fertilizers such as ammonium bicarbonate and chlorine. Ammonium, calcium, magnesium, phosphorus, etc. should not be used.
Appropriate concentration of suitable concentration of spraying fertilizer outside the roots is: urea 0.5%-2%, potassium dihydrogen phosphate 0.3%-0.5%, ammonium sulfate 0.2%-9.3%, borax 0.1%-0.2%, zinc sulfate 0.1%-0.4% Different crops use different concentrations, vegetable concentrations are slightly higher, and fruit tree concentrations are slightly lower. Under normal circumstances, the concentration must not be arbitrarily increased to avoid causing damage.
The amount of liquid to be sprayed should be determined in full accordance with the crop type and growth period. It is best when the fertilizer solution will flow from the foliage but does not flow down. General mu fertilizer 50-75 kg.
The spraying frequency should not be too low. Even if 1% urea solution is sprayed, the amount of mu should not exceed 2 kg of urea. This amount is much lower than the crop demand, so it must be sprayed 2-3 times in succession, with an interval of 7-10 days.
It is better to select fertilizers for fertilizer application outside the roots in wet weather to ensure that the leaves are wet for 30-60 minutes. To spray before 10 o'clock in the morning and after 5 o'clock in the afternoon, a cloudy day without wind can be sprayed all day.
Spraying different crops during the critical period of crops requires different fertilizers for different periods and requires flexibility. For example, rice and wheat should be in the heading stage, rapeseed, peanut and sesame should be in the initial flowering period, and corn and sorghum should be sprayed in the grain filling stage. In addition, when a crop appears to have a certain detoxification condition, it must be sprayed in a timely manner.
The spraying site should be properly used as fertilizer solution should be sprayed on the young leaves and stems of the crop. Spray as much as possible on the back of the dicotyledonous plant, spray on both sides of the monocotyledonous plant, and mainly positive.
Pay attention to the rational mix of two or more fertilizers can be sprayed to increase fertilizer efficiency; fertilizers and pesticides can improve work efficiency. It should be noted that alkaline and acidic fertilizers as well as fertilizers that will react cannot be mixed.
The fertilizer solution should be sprayed with uniform fertilizer to be fully stirred, sprayed evenly, and should not be sprayed, nor should it be repeated during the same spraying process.
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