In the middle and late stages of rice growth, the absorption function of the root system is declining day by day, while the panicle is still in the stage of nutrient enrichment and it needs sufficient nutrient supply. It is difficult to meet the requirements by fertilizing only one fertilizer process through the soil. If the method of supplementing the nutrients by spraying foliar fertilizers outside the roots allows rice stems and leaves to be directly absorbed and utilized, less fertilizer is used and the effect is quick. The application method is as follows:
Nitrogen-producing high-yielding rice requires early-onset, moderate-stable, and late-to-last growth. On cultivation, it is achieved by applying pre-induction, in-control, and post-supply fertilization measures. Therefore, the late spraying of nitrogen fertilizer on rice can prolong its lifespan and prevent premature denitrification. Generally, more than one 1% urea solution is sprayed at the booting stage and the initial stage of grouting, and it is better to spray with 3000-4000 times of 802 conditioner.
Phosphate fertilizer spraying phosphorus at the late stage of rice growth can increase the seed-setting rate and 1000-grain weight and promote early maturing. The 2% superphosphate solution is sprayed twice at the heading to filling stage. Preparation method: Take 2 kg of high-quality superphosphate, crush it, pour it into 10 kg of water and soak it for 24 hours, stir it regularly, filter it, and spray 60 kg of fertilizer per acre. In the nitrogen-depleted field block, a proper amount of urea mixed spray can be added to the prepared phosphate fertilizer solution.
Potassium fertilizer sprayed with potassium fertilizer solution once during the booting and heading stages of rice could promote heading and increase seed setting rate. Take 5 kg of fresh grass ash, add 100 kg of fresh water, and soak for 12 to 24 hours with sufficient stirring. Spray the clear liquid. Each time about 50 kg of fertilizer solution per acre, 1% potassium chloride solution can also be used.
Potassium dihydrogen phosphate sprayed on rice can improve its resistance, enhance heat and cold resistance, increase grain weight gain, and increase yield. It is generally sprayed once at the booting stage, full heading stage and filling stage. Each time, 150 g of monopotassium phosphate is used per acre, and 50 kg of diluted water is sprayed after spraying, which has a significant effect of increasing production. For double late rice, when the heading reaches 20%, 150 grams of monopotassium phosphate and 1 to 2 grams of 920 are used per acre. If it is a powder, it should be dissolved first with alcohol, evenly sprayed with 50 kg of diluted water, which can promote the heading and reduce the package. Neck, with a significant increase in production.
Zinc fertilizer rice is a sensitive zinc crop. Spraying zinc fertilizer solution once at the heading stage and heading stage can promote the orderly heading, strengthen the blade stamina, accelerate the nutrient operation, and is conducive to irrigation. Each time, 100 grams of zinc sulfate is used per acre, and 50 kg of water is diluted and sprayed. The effect of mixing with potassium dihydrogen phosphate is better and should not be mixed with phosphorus fertilizer.
During the filling stage of rice, boron fertilizer has sufficient supply of boron nutrition, a high seed setting rate, and a small amount of empty pods, especially in the application of hybrid rice. Generally, 0.1% to 0.2% borax solution is sprayed once at the full heading stage and the grain filling stage, which can increase production by about 10%. For the cold and rainy conditions that are not conducive to rice irrigation, spraying boron fertilizer is better. If borax is used as the foliar fertilizer, it should be dissolved with warm and hot water first, then diluted with water and sprayed in time to achieve good results.