The best top-dressing period for crops

I. Maize: After the jointing stage until the Dagukou period, it is the peak period for absorbing nutrients. Generally, the first fertilizer can be applied before and after jointing, and 150 kg of ammonium nitrate or 120 kg of urea can be topdressed per hectare. 7_10 Days should be followed by applying the second fertilizer, and 225 kg of ammonium nitrate or 180 kg of urea can be applied to each hectare. If the base fertilizer and seed fertilizer are more abundant and the soil is very fertile, you can concentrate on topdressing once, and use the second spade for deep fertilization. Second, Sorghum: In order to meet the requirements of sorghum from jointing to heading nutrients, the first fertilizer should be applied at the jointing stage, 150-225 kg of ammonium carbonate or 120-180 kg of urea should be applied per hectare; Fertilizer, topdressing 120 kg of ammonium carbonate or 75 kg of urea per hectare. III. Soybeans: Soybeans are crops that require more N fertilizers. They are usually applied once at the early flowering stage of soybeans. This can reduce the rate of falling flowers and plants, and can prolong the life span of plants, increase grain weight, and increase yield. Generally, they can be recovered per hectare. 150 ~ 225 kg of ammonium bicarbonate or 120 ~ 180 kg of urea; in the soybean crusting period, can be a root dressing, the effect is more pronounced. Fourth, sunflower: In addition to planting sunflowers to apply enough fat. Usually topdressing during the budding period, hectares topped 225 kg of ammonium carbonate or 180 kg of urea. Conditional farmers can also perform extra-root dressing in the flowering period. Fifth, castor: timely ricin top dressing, can promote early maturation and high yield. The first topdressing can be combined with Dingmiao, 225 kg of ammonium carbonate or 180 kg of urea per hectare of the whole nation. The second topdressing is carried out before flowering of ramie, mainly with phosphate fertilizer, which can increase the yield.

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Quantum Resonance Magnetic Analyzer

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