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The fertilizer requirement of corn is 2% of the total fertilizer requirement in the whole growth period, 85% in the ear stage and 13% in the grain stage. According to the survey, for every 100 kilograms of corn produced, it requires 2.5 kilograms of nitrogen, 0.9 kilograms of phosphorus and 2.2 kilograms of potassium. The peak period of corn fertilizer is from jointing to large flare. Generally, secondary topdressing is carried out, and the first time begins at jointing. 10 acres of urea, or 15 kilograms of ammonium nitrate, chasing the second fertilizer 7-10 days before the tassel, 12 kg of urea per mu or 17 kg of ammonium nitrate, if the soil organic matter content is high, the base fertilizer, the fertilizer foot, Corn grows well, chasing a fertilizer can also be used. The topdressing method can be combined with two times of shovel. It can also be used as a top dresser or a shovel (埯), but the depth of the top dressing must be above 10 cm, so as to improve the fertilizer utilization rate. .
Rice
Rice is a fertilizer that requires more nitrogen. Generally, for every 100 kilograms of rice, it needs about 2 kilograms of nitrogen. The absorption of nitrogen is gradually increased from the time of greening, and reaches the peak of fertilizer demand at the peak of the tillering. Quickly increase the effective tillering power, and apply heavy weight fertilizer early to promote tillering. The principle of rice topdressing is to eat less and eat more meals, that is, to apply the tiller fertilizer and the ear grain fertilizer. The time for applying the tiller fertilizer is 7-10 days after transplanting, and about 230 kilograms of ammonium sulfate per hectare, and enter 8-10 before heading. At the leaf stage, the young ears begin to differentiate and begin to apply panicle fertilizer. The panicle fertilizer can be applied in two times. The first time when the inverted 3 leaves are just exposed, about 60% of the total amount of panicle fertilizer is applied to promote the ear and branch. Once the number of spikelets is differentiated, the number of branches is increased, and the number of branches is increased. The second spike is applied at the tip of the flag leaf. The potassium fertilizer is sprayed at the later stage to increase the maturity and 1000-grain weight.
Soy
The fertilizer requirement of soybean is 20.4% of the total amount of fertilizer required for emergence and flowering, 54.6% of flowering to drum, and 25% of drum to maturity. For every 100 kilograms of soybeans produced, about 5 kilograms of nitrogen, about 1.6 kilograms of phosphorus, and about 3.7 kilograms of potassium are needed. Soybeans need more nitrogen, and their rhizobium can only satisfy 1/2-1/3 of soybean nitrogen. The key period of nitrogen demand is seedling and flowering stage. When the initial flowering stage is applied with nitrogen fertilizer, it can reduce the drop of flowers and leaves, and the absorption of phosphate fertilizer by soybeans. The flowering and flowering phosphorus account for 15% of the total amount. Phosphorus accounted for 60%, and pods to drums accounted for 25% of phosphorus; soybeans required potassium fertilizers to be more than nitrogen fertilizers and more than phosphate fertilizers. The emergence of flowering and potassium absorption accounted for 32.2%, and the flowering to drums accounted for 61.9%. 5.9%. Soybean topdressing: First, the rhizosphere topdressing, when the soybean growth is weak, combined with the second shovel, the application of nitrogen fertilizer, 45-75 kg of urea per hectare, immediately after the topdressing soil, to prevent evaporation, improve utilization, play fertilizer The second is the top dressing. When the soybean grows weakly in the early stage, it is used in the initial flowering stage of soybean at 10 kg per hectare plus 1.5 kg of potassium dihydrogen phosphate, dissolved in 500 kg of water, and can also be added with trace element fertilizer for foliar application. .
Scientific topdressing method for three major crops
corn
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