As the old saying goes, "there is no harvest in the water, the harvest is less in the fertilizer", we can not do without nitrogen fertilizer when planting vegetables, nitrogen fertilizer can promote the growth of stems and leaves, crops will grow weaker when there is a lack of nitrogen fertilizer, and the leaves will lose green and yellow, it can be said that nitrogen fertilizer is the fertilizer we use the most.
Nitrogen fertilizers include urea, ammonium carbonate, ammonium bicarbonate, ammonium sulfate, ammonium nitrate, ammonium chloride and other fertilizers, of which urea is the nitrogen fertilizer with the highest nitrogen content, urea can be applied at the root (as deep as possible), and can also be applied on the foliar surface. Urea foliar topdressing has the characteristics of fast absorption, high efficiency, low dosage and strong effect, today I will share with you the 4 best formulas of urea, which can give full play to the potential of urea production, which is very practical.
Although urea has a high nitrogen content, it does not contain other nutrients, so we only apply nitrogen fertilizer to crops, which cannot meet the nutrient needs of crops.
When spraying crops with urea foliar fertilizer, it is best to apply it together with potassium dihydrogen phosphate. Potassium dihydrogen phosphate is a high-efficiency phosphorus and potassium binary compound fertilizer, we match urea and potassium dihydrogen phosphate together for foliar spraying, which can supplement the crops with nitrogen, phosphorus and potassium at the same time, which is very conducive to the healthy growth of crops.
Specific use method: In any growth period of vegetables, we can use "50 grams of urea + 50 grams of potassium dihydrogen phosphate" per mu, mixed with 20 kg of water for foliar spraying, spray every 10 days, spray 2 3 times in a row, vegetables will grow greener, and the amount of fruit will be greatly increased.
In addition to being sprayed with potassium dihydrogen phosphate, urea can also be sprayed with glucose. Glucose is the product of plant photosynthesis, we can use "100 grams of urea + 50 grams of glucose" per mu with 20 kg of water for foliar spraying, which can effectively improve the efficiency of photosynthesis, crops can synthesize more organic matter per unit time, the leaves of vegetables will become greener and thicker, and the growth of vegetables will be greatly accelerated.
Weeds compete with crops for water, nutrients and sunlight, so weeding is a problem we must solve in agriculture. In modern agricultural production, in order to improve the efficiency of weeding, people generally choose to spray chemical herbicides to kill weeds, but many people will have the phenomenon that weeds cannot be killed when spraying herbicides.
What is the effect of adding urea to herbicides?The herbicide is easily soluble in water, and after we spray the urea solution on the weed, we can soften the cuticle of the weed's epidermal cells, which can accelerate the penetration of the herbicide into the weed, thereby improving the herbicide's weeding effect.
The aqueous solution of urea is neutral, so the addition of urea when spraying herbicides will not destroy the physicochemical properties of herbicides. How to use it: We can add 30 grams of urea to each pot of herbicide solution, stir well, and then carry out foliar spraying.
The fourth formula we still need to master when spraying urea foliar fertilizer is to apply it with "amine fresh ester", which is a high-efficiency broad-spectrum non-toxic plant growth regulator, which can be compounded with fungicides, insecticides and foliar fertilizers.
Amine fresh ester can improve the photosynthesis efficiency of plants, promote the development of crop roots, and improve the stress resistance of plantsWhen we plant cabbage, spinach, celery, lettuce, water spinach, cabbage, coriander and other leafy vegetables, we can use "100 grams of urea + 10 grams of 8% amine fresh ester" per mu, mixed with 20 kg of water for foliar spraying, which can greatly promote the vegetative growth of plants, and the leaves of vegetables are widened, thickened and greened, and can be effective after spraying for 3 days
For peppers, eggplants, tomatoes, cucumbers, loofahs, zucchini and other fruits and vegetables, we can use "50 grams of dipotassium hydrogen phosphate + 10 grams of 8% amine fresh ester" per mu, mixed with 20 kg of water for foliar spraying, which can greatly improve the fruit setting rate and disease resistance of plants, promote early maturity and high yield of melons and fruits, and increase yield by 30% and 40%.
Special Attention:When we spray foliar fertilizer on vegetables, we should not blindly increase the concentration, such as urea, which is sprayed at a concentration of 05～0.8%, the spraying concentration should not exceed 1%, otherwise it is easy to cause fertilizer damage;Like potassium dihydrogen phosphate, the spray concentration is 02%～0.3%, i.e. 0. per 100 grams of water2～0.3 g potassium phosphate monobasic.
In addition, when we spray foliar fertilizer, we should not spray it at noon when the evaporation is large, we should choose to spray it on a cloudy day, or choose to spray it in the morning and evening when the evaporation is small, so as to improve the spraying effect of foliar fertilizer.
In summary, the above are the 4 best partners of urea foliar fertilizer, and we have mastered it that is very helpful for us to grow high-yield and high-quality vegetables, and the fertilizer efficiency of urea will be greatly improved.