What should be paid attention to when spraying foliar fertilizer on vegetables

What should I pay attention to when spraying foliar fertilizer on vegetables? Please instruct leafy vegetables such as cabbage, spinach, shepherd's purse, etc. to need more nitrogen. The fertilizer should be mainly urea and ammonium sulfate. The spraying concentration of urea should be 1%~2%, ammonium sulfate should be 1.5%, spraying 2~4 times per season, and spraying in the early stage of growth is appropriate. Fruits and vegetables such as pepper, eggplant, tomato, beans and all kinds of melons, the need for nitrogen, phosphorus and potassium is more balanced, nitrogen, phosphorus and potassium mixed solution or compound fertilizer should be selected. Spray 1 - 2% urea and 0.3 - 0.4% potassium dihydrogen phosphate mixed solution or 2% compound fertilizer solution. Generally sprayed 1~2 times in the early and late stages of growth. Spraying at later stage can prevent premature senescence, enhance stamina and have good yield increase effect. Rhizome vegetables such as garlic, onion, radish, potato and so on need more phosphorus and potassium, foliar fertilizer can choose 0.3% potassium dihydrogen phosphate solution, 10% plant ash extract. Spraying 3~4 times per season is generally effective. Foliar fertilizer spraying in cloudy days or sunny afternoon sunlight is not too strong when the best effect, according to the growth of vegetables, each time spray solution 30~50 kg per mu, to wet the foliar fertilizer limit. According to the demand of different vegetables for trace elements, appropriate supplementary application of corresponding trace fertilizers can increase yield and improve quality, save labor and multiple effects, but avoid acid and alkali neutralization. Click for more vegetable planting techniques Click for more foliar fertilizer application techniques Click for more fertilizer application techniques