I. Determination of fertilization amount The millet in Shandong Province is mainly summer valley. In the case of high yield, for every 100 kg of grain, it is necessary to absorb 2.5 to 3 kg of pure nitrogen, 1 to 1.2 kg of phosphorus pentoxide, and 4 to 5 of potassium oxide. In kilograms, the amount of fertilizer required can be calculated based on the output index. According to the current production experience, under medium fertility conditions, every 667 square meters (1 mu) can be applied with organic fertilizer 2000-2500 kg, urea 15-20 kg, and superphosphate 40-40 kg. The application of potash fertilizer varies from soil to soil. The fluvo-aquic soil and cinnamon soil generally contain more potassium. Under the conditions of sufficient application of organic fertilizer, potassium fertilizer may not be applied, and brown loam soil should be supplemented with potassium fertilizer. With the continuous increase of biological output throughout the year, there is no shortage of potassium in the past, and potassium deficiency will occur due to the increase in output. If the potassium in the former crop is insufficient, about 15 kilograms of potassium sulfate can be added per 667 square meters. Sand, sandy loam, and loess soil are prone to boron deficiency. Pay attention to spraying boron fertilizer.
Second, the fertilization technology Phosphorus, potassium fertilizer is not easy to lose, can be used as the base fertilizer, if used as top dressing should be applied as soon as possible. Nitrogen fertilizers have poor stability and fast and short-acting fertilizers, so they should be applied in stages and deep rigorous.
1. Base fertilizer and seed fertilizer. Applying the base fertilizer is the basis for achieving high yield of millet. All organic fertilizer, phosphate fertilizer, potassium fertilizer, micro-fertilizer and about 1/3 of nitrogen fertilizer can be applied as base fertilizer. Applying the seed fertilizer is also an effective stimulation measure. It uses about 3 kilograms of diammonium phosphate or urea per 667 square meters, and is applied to the ditch with the seeds at the time of sowing. If the soil is dry, pay attention to reduce the amount of fertilizer and separate the seeds from the fertilizer to avoid affecting emergence.
2. Pull the joint fertilizer. Medium and low fertility conditions and fertilizers should be applied immediately after jointing. The amount of fertilizer applied accounts for 45% to 50% of the total amount of nitrogen fertilizer. Areas with short frost-free period and varieties with long growth period should be applied early and heavy fertilizers should be applied to avoid the late maturity of millet. High-yield fields with good soil fertility and base fertilizer should be lightly applied with fertilizer, and joint fertilizer should account for less than 30% of total nitrogen. Simplified cultivation can combine jointing fertilizer and panicle fertilizer into one application, and the application time is later than that of jointing fertilizer, but not later than the booting stage.
3. Spike fertilizer. Spike fertilizer should be applied 7 to 10 days before heading, high yield fields must increase the amount of panicle fertilizer, 40% to 50% of total nitrogen should be applied as panicle fertilizer, and low yield fields should use 20% to 25% of total nitrogen as ear. fat. The application of panicle fertilizer can be combined with cultivating soil and watering. If there is a phenomenon of de-fertilization during the flowering period of millet, a small amount of nitrogen fertilizer should be applied in combination with watering, especially in the sandy soil with poor fertility, the number of topdressing should be increased, and the fertilizer should be added at any time. In the filling stage, the method of root external spraying can be applied as appropriate. Spraying 0.5% to 1% urea solution or 0.2% potassium dihydrogen phosphate solution, spraying 50-60 kg per 667 square meters, can extend the functional period of the leaf and increase the grain. weight.
4. Foliar spray of boron. When foliar spray is used, the concentration, amount, spray period and number of boric acid solutions should be correctly applied. With a boric acid solution of 300-400 mg/kg concentration, spray once a week before the heading, 100 kg of boric acid solution per 667 square meters, and spray once more every 10 days.
Second, the fertilization technology Phosphorus, potassium fertilizer is not easy to lose, can be used as the base fertilizer, if used as top dressing should be applied as soon as possible. Nitrogen fertilizers have poor stability and fast and short-acting fertilizers, so they should be applied in stages and deep rigorous.
1. Base fertilizer and seed fertilizer. Applying the base fertilizer is the basis for achieving high yield of millet. All organic fertilizer, phosphate fertilizer, potassium fertilizer, micro-fertilizer and about 1/3 of nitrogen fertilizer can be applied as base fertilizer. Applying the seed fertilizer is also an effective stimulation measure. It uses about 3 kilograms of diammonium phosphate or urea per 667 square meters, and is applied to the ditch with the seeds at the time of sowing. If the soil is dry, pay attention to reduce the amount of fertilizer and separate the seeds from the fertilizer to avoid affecting emergence.
2. Pull the joint fertilizer. Medium and low fertility conditions and fertilizers should be applied immediately after jointing. The amount of fertilizer applied accounts for 45% to 50% of the total amount of nitrogen fertilizer. Areas with short frost-free period and varieties with long growth period should be applied early and heavy fertilizers should be applied to avoid the late maturity of millet. High-yield fields with good soil fertility and base fertilizer should be lightly applied with fertilizer, and joint fertilizer should account for less than 30% of total nitrogen. Simplified cultivation can combine jointing fertilizer and panicle fertilizer into one application, and the application time is later than that of jointing fertilizer, but not later than the booting stage.
3. Spike fertilizer. Spike fertilizer should be applied 7 to 10 days before heading, high yield fields must increase the amount of panicle fertilizer, 40% to 50% of total nitrogen should be applied as panicle fertilizer, and low yield fields should use 20% to 25% of total nitrogen as ear. fat. The application of panicle fertilizer can be combined with cultivating soil and watering. If there is a phenomenon of de-fertilization during the flowering period of millet, a small amount of nitrogen fertilizer should be applied in combination with watering, especially in the sandy soil with poor fertility, the number of topdressing should be increased, and the fertilizer should be added at any time. In the filling stage, the method of root external spraying can be applied as appropriate. Spraying 0.5% to 1% urea solution or 0.2% potassium dihydrogen phosphate solution, spraying 50-60 kg per 667 square meters, can extend the functional period of the leaf and increase the grain. weight.
4. Foliar spray of boron. When foliar spray is used, the concentration, amount, spray period and number of boric acid solutions should be correctly applied. With a boric acid solution of 300-400 mg/kg concentration, spray once a week before the heading, 100 kg of boric acid solution per 667 square meters, and spray once more every 10 days.
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