In the middle and late growth stages of late rice, especially after booting, with the gradual decline of temperature, the root absorption function is declining, while the ear is still in the stage of nutrient enrichment, and sufficient nutrient supply is needed. If there is a process of fertilizing through the soil, if the foliar fertilizer is added to the roots to supplement the nutrients and the rice stems and leaves are directly absorbed and utilized, the fertilizer is less and the effect is quick. The type of foliar fertilizer and the method of fertilization on late rice are:
1. Nitrogen fertilizer Late rice is deficient in nitrogen in the late growth stage, and the leaves are yellow and premature, and the seed setting rate is reduced. Spraying 1% urea and 4000 times 802 mixture at the booting stage and the beginning of the grouting can prolong the life of the functional leaves and increase the yield. It is advisable to carry out the spraying time at 8 to 10 am or after 5 pm.
2. Phosphorus fertilizer spraying phosphorus in the late growth stage can increase the seed setting rate and 1000-grain weight and promote maturity. Generally, a 2% concentration of a superphosphate solution is sprayed from the heading to the filling stage. The preparation method is as follows: take 2 kg of high-quality superphosphate, pulverize and pour into 100 kg of water, stir well, soak for 24 hours, then filter, and spray 60 kg of filter solution per acre. In the nitrogen-deficient field, it can be sprayed in 50 kg of urea and 0.5 kg of urea in the prepared phosphate fertilizer solution.
3. Potassium fertilizer sprays potassium fertilizer solution in the booting stage and the heading stage of late rice, which can promote heading and increase seed setting rate. Take 5 kg of fresh grass wood ash, add 100 kg of water to soak (fully stir) for 24 hours, take the clarified liquid spray, and spray about 50 kg per mu of spray fertilizer. A 1% potassium chloride solution or a 2% potassium nitrate solution may also be used.
4, potassium dihydrogen phosphate potassium dihydrogen phosphate is a high concentration of binary compound fertilizer, sprayed on late rice, can enhance cold resistance, increase grain weight gain and increase production. Generally, it is sprayed once at the booting stage and at the heading stage, and 150 g of potassium dihydrogen phosphate per acre is used, and 50 kg of water is sprayed. When the heading reaches 20%, use 150 grams of potassium dihydrogen phosphate per acre plus 1 to 2 grams of 920 (if it is a powder, it should be dissolved first with alcohol or high-alcohol), and evenly spray 50 kg of water to promote uniform heading. , reducing the neck, has a significant increase in production.
5. Zinc sulphate is selected from zinc fertilizer. First, it can be sprayed once at the beginning of the earing stage to promote the tidying of the heading. Secondly, spraying once at the heading stage can accelerate the operation of nutrients, enhance the resistance of the leaves, and promote the filling and firming. Each time, 100 grams of zinc sulfate per acre, sprayed with 50 kilograms of water, such as mixed with potassium dihydrogen phosphate spray, the effect is better.
6. Boron fertilizer in the late rice filling stage, boron nutrient supply is sufficient, the seed setting rate is high, and there is less open space. Spraying 0.1% to 0.3% of borax solution in the hybrid late rice stage and filling stage can increase yield by about 10%. When it is not suitable for the low temperature and rainy weathering of late rice, the effect of spraying boron is better. When preparing the borax solution, first dissolve the borax with a small amount of warm water, and spray it in time.
1. Nitrogen fertilizer Late rice is deficient in nitrogen in the late growth stage, and the leaves are yellow and premature, and the seed setting rate is reduced. Spraying 1% urea and 4000 times 802 mixture at the booting stage and the beginning of the grouting can prolong the life of the functional leaves and increase the yield. It is advisable to carry out the spraying time at 8 to 10 am or after 5 pm.
2. Phosphorus fertilizer spraying phosphorus in the late growth stage can increase the seed setting rate and 1000-grain weight and promote maturity. Generally, a 2% concentration of a superphosphate solution is sprayed from the heading to the filling stage. The preparation method is as follows: take 2 kg of high-quality superphosphate, pulverize and pour into 100 kg of water, stir well, soak for 24 hours, then filter, and spray 60 kg of filter solution per acre. In the nitrogen-deficient field, it can be sprayed in 50 kg of urea and 0.5 kg of urea in the prepared phosphate fertilizer solution.
3. Potassium fertilizer sprays potassium fertilizer solution in the booting stage and the heading stage of late rice, which can promote heading and increase seed setting rate. Take 5 kg of fresh grass wood ash, add 100 kg of water to soak (fully stir) for 24 hours, take the clarified liquid spray, and spray about 50 kg per mu of spray fertilizer. A 1% potassium chloride solution or a 2% potassium nitrate solution may also be used.
4, potassium dihydrogen phosphate potassium dihydrogen phosphate is a high concentration of binary compound fertilizer, sprayed on late rice, can enhance cold resistance, increase grain weight gain and increase production. Generally, it is sprayed once at the booting stage and at the heading stage, and 150 g of potassium dihydrogen phosphate per acre is used, and 50 kg of water is sprayed. When the heading reaches 20%, use 150 grams of potassium dihydrogen phosphate per acre plus 1 to 2 grams of 920 (if it is a powder, it should be dissolved first with alcohol or high-alcohol), and evenly spray 50 kg of water to promote uniform heading. , reducing the neck, has a significant increase in production.
5. Zinc sulphate is selected from zinc fertilizer. First, it can be sprayed once at the beginning of the earing stage to promote the tidying of the heading. Secondly, spraying once at the heading stage can accelerate the operation of nutrients, enhance the resistance of the leaves, and promote the filling and firming. Each time, 100 grams of zinc sulfate per acre, sprayed with 50 kilograms of water, such as mixed with potassium dihydrogen phosphate spray, the effect is better.
6. Boron fertilizer in the late rice filling stage, boron nutrient supply is sufficient, the seed setting rate is high, and there is less open space. Spraying 0.1% to 0.3% of borax solution in the hybrid late rice stage and filling stage can increase yield by about 10%. When it is not suitable for the low temperature and rainy weathering of late rice, the effect of spraying boron is better. When preparing the borax solution, first dissolve the borax with a small amount of warm water, and spray it in time.
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