Rice
Rice is a crop that requires a large amount of nitrogen. Generally, 500 kg of rice and straw each produce 6.7–15.8 kg of nitrogen, 3.9–8.1 kg of phosphorus, and 9.2–26.7 kg of potassium. The ratio of nitrogen, phosphorus and potassium is about 1:0.5:1.5. However, in practical production, due to different cultivation areas, different crop varieties, and different cultivation conditions, the amount of fertilizers absorbed by rice is different, which should generally be higher than this. Therefore, if the output reaches 400-600 kg/mu, the total amount of nitrogen used for the whole year is about 40-60 kg of ammonium sulfate (effective nutrient content 10%-21%), or equal amount of ammonium bicarbonate (effective nutrient content 16.8%-17.5%), ammonium chloride (effective nutrient content 22%-25%) and urea (effective nutrient content 45%-46%). The absorption rate of various nutrients in rice reached its maximum value before heading, and the heading was the dividing line. In each nutrient, nitrogen, phosphorus, and potassium are absorbed most rapidly. The maximum value was reached 20 days before heading. Phosphorus uptake by rice did not differ significantly at all stages of growth. The period of maximum uptake was from tillering to young panicle differentiation. The absorption of potassium by rice is mainly the differentiation of panicle to heading and flowering, followed by tiller to panicle differentiation, and it is basically not absorbed after heading.
wheat
Generally, for every 100 kilograms of wheat grains and corresponding stalks, it is necessary to absorb about 3 kilograms of nitrogen from the soil, about 1.5 kilograms of phosphorus and 3-4 kilograms of potassium. Therefore, if the yield per acre is 250-300 kg, the average Mushi nitrogen is 7.5-9 kg, the pure phosphorus is 3.8-4.5 kg, and the pure potassium is 7.5-12 kg. With the increase of the production level, the amount of fertilizer per acre is also It should be increased accordingly, but more phosphorus and potassium fertilizers should be added. During the period from the emergence of wheat to the three-leaf stage, due to the low temperature, the subsoil is still frozen, and the supply of nutrients is insufficient. Therefore, a certain amount of available nitrogen, phosphorus, and potassium fertilizers are required at seedling stage. From the three-leaf stage to the heading stage, nitrogen fertilizers need to be strengthened with appropriate amounts of phosphorus and potassium fertilizers. From heading to maturity, certain nitrogen nutrition should be maintained. Before the heading of spring wheat, it is a stage of rapid growth and development. More than 90% of nitrogen, more than 80% of phosphorus, and more than 90% of potassium are absorbed before heading. Therefore, fertilization of spring wheat should be based on basal fertilization. The principle of seed fertilizer is mainly supplemented by top dressing.
corn
For every 100 kg of corn grain produced, approximately 2-4 kg of pure nitrogen, 0.7-1.5 kg of phosphorus, and 1.5-4.0 kg of potassium are required. If the yield per mu is 400 kg corn, the average application rate is 40-60 kg of ammonium sulfate or other nitrogenous fertilizer, 40-60 kg of superphosphate (effective nutrient content 10%-16%), or the amount of phosphorus. Heavy superphosphate (36%-52% effective nutrient content) and calcium magnesium phosphate (effective nutrient content 12%-16%), 6-10 kilograms of potassium sulfate (48%-52% effective nutrient content) or potassium chloride (effective nutrient content 50% - 52%), potassium fertilizer can also be used instead of plant ash, 40-60 kg per acre. The amount and proportion of these nutrients required by corn varies depending on the type of corn cultivation, its characteristics, yield levels, and soil and climatic conditions. In determining the amount of corn fertilization, it should be considered comprehensively. The absorption of nutrients varies during different growth periods of maize. In the seedling stage, the plants are small, grow slowly, and absorb less nutrients; from jointing and booting to heading and flowering, the growth rate of corn rapidly increases, vegetative growth and reproductive growth go hand in hand, and the absorption increases significantly. After flowering and pollination, the absorption decreases.
Soybean
Each production of 100 kg of soybean grain requires 7.0-9.5 kg of nitrogen, 1.3-1.9 kg of phosphorus, 2.5-3.0 kg of potassium, and nitrogen, phosphorus, and potassium are approximately 1:0.2:0.3. An average of 50-60 kg of ammonium sulfate or other nitrogen fertilizer is required per acre; 40-65 kg of super phosphate or other phosphorus fertilizer; 8-16 kg of potassium sulfate or potassium chloride. If potash is used for plant ash 100-125 kg. Soybean seedlings should be fed with less fertilizer, and by the end of the branch, the absorbed nitrogen and phosphorus were 15%-17.3% of the total absorption during the whole growth period. After the flowering of soybeans, the supply of nitrogen should be sufficient, but not too much, accounting for 60% of the total absorption and 60% of phosphorus absorption. To maturity, this period is relatively short, phosphorus absorption accounts for 20%, and nitrogen absorption accounts for about 15%.
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