Fertilization technology of millet Fertilization formula of millet

1. Nutritional characteristics of millet: The absorption of nitrogen, phosphorus and potassium by millet at different growth stages is different. Before heading, the nitrogen uptake of low-yield and high-yield valleys accounted for 76.5% and 63.5% of the total nitrogen uptake, respectively. The nitrogen uptake of low-yield fields is large in the early stage, while that of high-yield fields is relatively small. Nitrogen absorption intensity was the highest from jointing to heading stage, followed by flowering and filling stage. Seedling growth is slow, and nitrogen uptake is small, accounting for only 1% ~ 7% of the whole growth period, and it increases with the increase of dry matter after jointing. Nitrogen uptake was the highest at booting stage, accounting for 60% ~ 80% of the whole growth period. Under the condition of low yield, the phosphorus absorption intensity was the highest at booting stage, but the phosphorus absorption intensity was the highest at the later stage of middle and high yield fields, and reached the peak at milk ripening stage. The phosphorus absorption at this stage is 27.8% higher than that at booting stage, 65,438+06.9% higher than that at booting stage and 69 times higher than that at seedling stage. The absorption and maximum accumulation intensity of potassium at jointing and heading stage accounted for 50.7% of the total absorption during the growth period. It takes about 2.7 1 kg nitrogen and 4 kg phosphorus (P205) 1 kg potassium (K20) to produce 100 kg millet seeds.

2. Fertilization technology

Adequate base fertilizer is the basis of high yield of millet. In order to avoid soil moisture loss before tillage, autumn or early spring is often used to ensure the whole seedling of millet. Generally speaking, the yield of millet is within the range of 2000 kilograms of organic fertilizer per 667 square meters, and gradually increases with the increase of fertilizer application. However, it should be noted that the optimum fertilization amount is influenced by varieties, soil fertility level, cultivation measures, yield level, climate factors and other conditions, and will increase or decrease appropriately with the changes of related factors. While applying organic fertilizer, a certain amount of nitrogen and phosphorus fertilizer should be applied. As far as fertilization methods are concerned, shallow application is not as good as deep application, and spreading application is not as good as furrow application.

Seed fertilizer is a kind of high-quality agricultural fertilizer or chemical fertilizer, which is concentrated near the seeds when sowing, or can be mixed with the seeds. The effect of seed fertilizer is related to the amount of fertilizer applied. The amount of nitrogen fertilizer applied per 667m2 is generally 0.5 ~ 1 kg, and the amount of potassium sulfate is 2.5kg. Topdressing can be divided into seedling fertilizer, jointing fertilizer, panicle fertilizer and grain fertilizer. Topdressing at seedling stage can promote the formation of strong seedlings, but nitrogen fertilizer should not be applied more. Generally, the amount of jointing fertilizer is large, the purpose is to promote the differentiation of strong stalks and spikelets, set up a high-yield shelf, and ensure that large spikes form full grains. When the application of base fertilizer and jointing fertilizer is insufficient and the population may apply panicle fertilizer in the later stage. In barren plots and alpine regions, the suitable topdressing period of nitrogen fertilizer can be advanced.