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Scientific topdressing method for corn and rice
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 stagnation, generally secondary topdressing, the first jointing At the beginning, 10 kg of urea is used, or 15 kg of ammonium nitrate. The second season is followed by 7 to 10 days before the tasseling. The urea is 12 kg per mu or 17 kg of ammonium nitrate. If the soil organic matter content is high, the base fertilizer and the fertilizer are sufficient. The corn grows well, and it can be used to catch a fertilizer. The topdressing method can be combined with the second shovel. It can also be used with a top dressing machine or a draft hole (埯), but the depth of the top dressing must be more than 10 cm, so as to improve the use of fertilizer. rate.
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.
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