The quick effect of foliar dressing and the use of fertilizers can meet the growing demand of citrus in time and is an indispensable measure for the production of high-quality citrus.
Fertilizer type and spraying concentration of nitrogen fertilizer is best for urea, followed by ammonium sulfate. The superphosphate in the phosphate fertilizer, the plant ash in the potassium fertilizer, potassium sulfate, potassium nitrate, the rare earth in the micro fertilizer, magnesium sulfate, manganese sulfate, borax, etc. should be applied in an appropriate amount. Commonly used concentration: general urea is 0.3%~0.5%; superphosphate is 1%~2% (soaking for 2~3 days, use clear liquid after filtration), potassium sulfate is 0.5%, zinc sulfate, magnesium sulfate, manganese sulfate 0.05%~0.1%, borax, boric acid 0.05%~0.2%. Compound fertilizer leaching solution (with 1 kg compound fertilizer immersed in 4 kg of clean water, fully stirred for about half a day, taking solution clarification) spraying concentration of 0.5% to 1%.
Spraying time and effect The young fruit period was sprayed with compound fertilizer leaching solution plus borax or potassium dihydrogen phosphate solution from the beginning of June to the middle of July, and was sprayed twice in about 15 days. During the physiological fruit drop period, 50 ppm gibberellic acid plus 0.2% potassium dihydrogen phosphate plus 0.5% urea mixture was sprayed twice to prevent the young fruit from separating and increase fruit setting rate. During fruit enlargement, 0.2% potassium dihydrogen phosphate plus 0.3% urea and 0.2% borax were sprayed once every one month to increase the citrus fruit weight. In the later period of fruit enlargement, spray 1-2 times of 1% synthetic detergent plus 0.2% potassium dihydrogen phosphate mixture to remove pericarp dirt, evenly color the skin and increase sugar content.
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