Scientific top dressing method for three major crops

The fertilizer requirement of corn and corn is 2% of the total amount of fertilizer needed in the seedling stage, 85% in the ear stage, and 13% in the grain stage. According to the survey, for every 100 kilograms of maize produced, 2.5 kg of nitrogen, 0.9 kg of phosphorus, and 2.2 kg of potassium are required. The peak period of corn need fertilizer is from jointing to big bell-mouth, and the second fertilizer is generally performed. The first time it starts at the jointing , Mu recovery 10 kg of urea, or 15 kg of ammonium nitrate, in the first 7-10 days after tasseling chase the second round of fertilizer, catching 12 kg of urea per mu or ammonium nitrate 17 kg, if the soil organic matter content is high, base fertilizer, seed fat enough, The growth of corn is good. It can also be used to recover a fertilizer. The top dressing method can be used in combination with the shovel twice. It can also be used as a fertilizer applicator, or can be used to grind the hole (埯), but the top dressing must be 10 cm or more in order to increase fertilizer utilization. . Paddy rice is a fertilizer that requires more nitrogen. Generally, for every 100 kilograms of rice, about 2 kilograms of nitrogen is needed. The absorption of nitrogen is gradually increased after returning to green, and the peak period of tillering reaches the peak of demand fertilization. Early birth and rapid growth, improve the effective delivery force, should be applied early heavy fertilizer, promote delivery. The principle of rice top-dressing is to eat less and more meals, that is, topdressing tiller fertilizer and ear-grain fertilizer. The topdressing time for tiller fertilizer is 7-10 days after transplanting, 230 kg of ammonium sulfate is applied per hectare, and 8-10 before heading. At the leaf stage, young panicles begin to differentiate and begin to top-dress panicle fertilizer. Panicle fertilizer can be applied in two separate applications. When the first 3 leaves have just been exposed, the total amount of panicle fertilizer is about 60%, promoting the panicle and branch stalks. One number of spikelets differentiated to increase the number of primary branches and strive for large spikes; the second application of the remaining panicle fertilizer was at the tip of the flag leaf; potassium dihydrogen phosphate could also be sprayed at later stages to increase maturity and 1000-grain weight. Soybean soybeans need fertilizer law that seedlings to flowering accounted for 20.4% of the total fertilizer requirement for the entire growth period, flowering to drum grain accounted for 54.6%, drum grain to mature accounted for 25%. For every 100 kilograms of soybeans produced, about 5 kilograms of nitrogen, about 1.6 kilograms of phosphorus, about 3.7 kilograms of potassium, and more nitrogen for soybeans, the rhizobia can only meet the soy nitrogen requirement of 1/2-1/3 soy. The critical period of nitrogen requirement is the seedling and flowering stage. The first application of nitrogen fertilizer at the early flowering stage can reduce the falling of flowers, the absorption of phosphorus by soybeans, and the flowering and flowering phosphorus absorption accounts for 15% of the total amount. Phosphorus absorption accounted for 60%, and phosphorus absorption accounted for 25% of the grains. Soybeans needed potassium fertilizers more than nitrogen fertilizers but more phosphorus fertilizers. The rate of seedling emergence and flowering potassium accounted for 32.2%, flowering accounted for 61.9% of grains, and drum grain accounted for maturity. 5.9%. Soy topdressing: First, the top-dressing fertilizer, when the soybean growth is weak, combining two times to shovel spasm, topdressing nitrogen fertilizer, topdressing urea 45-75 kg per hectare, immediately after top dressing, prevent evaporation, improve utilization, play a fertilizer effect The second is extra-root topdressing, when the early growth of soybean is weak, 10 kg of urea and 1.5 kg of potassium dihydrogen phosphate per hectare are used in the initial flowering period of soybeans, dissolved in 500 kg of water, and trace element fertilizer may also be added for foliar spraying. .

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