Rational fertilization for sorghum cultivation

Sorghum has wide adaptability to soil, strong fertility, and is planted on sandy loam with rich organic matter and high fertility. It is easy to obtain high yield. In lean and dry land, phosphorus and low potassium are needed, and fertilizer must be added to obtain good harvest. . The sorghum seedlings have small plants and require less fertilizer, but they are more stringent. From jointing to flowering, the plants grow vigorously, and the distribution center of nutrients, from the beginning of jointing, also turns from stems and leaves to young ears, and finally stored in the ears to form kernels. Therefore, ensuring adequate nutrient supply at this time is the basis for high yield. From flowering to maturity, the nutrient supply of NPK directly affects the filling and maturity of sorghum, and the proper supply of nitrogen can accelerate the grouting and increase the protein content in the grain, but too much too late will cause glutinous and late maturity, reducing yield and quality.

Generally, it is required to apply 2,000 to 3,000 kilograms of organic fertilizer, 15 to 25 kilograms of superphosphate, 10 to 20 kilograms of potassium fertilizer, and the base fertilizer. There are two methods for applying the fertilizer and the application of the fertilizer. The application of the fertilizer is combined with the cultivation of the field before sowing. , Shi Shiji fertilizer. The strips are applied by ridge ditch before and after sowing. In addition, when planting, the soil is fertilized with 1000 kg of diluted manure water or a small amount of nitrogen fertilizer for seed fertilizer, which is beneficial to the whole seedlings and strong seedlings. Topdressing is mainly based on quick-acting nitrogen fertilizer, mainly applying fertilizer and booting fertilizer. The best topdressing period of sorghum is in the jointing stage and the big bell stage, which promotes ear differentiation and reduces florescence degradation, and achieves more large spikes. When topdressing urea exceeds 15 kg per acre, it should be applied in stages. Before the sorghum topdressing, the weight is good, the heavy fertilizer is applied (jointing stage), and the light-earing fertilizer (shelfing stage) is applied. Generally, when two-thirds of the leaves are fully displayed, the potassium fertilizer is applied 5 to 8 kg per mu. kg. Ditching, applying or spreading, it must be accompanied by deep cultivating or watering to benefit the fertilizer. In the late growth stage, the root can be properly topdressed, and potassium dihydrogen phosphate (0.1% concentration) or urea (2% concentration) is sprayed at the early stage of heading and filling to promote early maturity and increase yield. In the production of sorghum, we must pay attention to balanced fertilization, especially the application of nitrogen and phosphorus, which can avoid the imbalance of nutrient supply and significantly improve the fertilizer efficiency. On low-yield plots, the soil is originally deficient in nitrogen and phosphorus, and a single fertilizer is often used because of the imbalance of nitrogen and phosphorus, which does not function well, resulting in waste of fertilizer and little effect on yield increase.

According to experimental research, the application of nitrogen and phosphorus as seed fertilizer can promote fertility, grow fast in seedling stage, increase in leaves, strong growth potential, enhance plant metabolism, increase plant absorption capacity, significantly improve fertilizer efficiency, increase ear weight, and increase yield. Can multiply the output. Therefore, rational allocation in low-yield soil, balanced fertilization is an effective measure for economic fertilization.

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