There is a stress on applying phosphorus in wheat
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In the wheat production, some places are not diazo light phosphorus, or the method of applying phosphorus is wrong, which affects the effect of increasing production. Phosphorus in wheat science should pay attention to the following points: First, look at soil organic matter content in soil below 1.5% organic matter, phosphorus application of the best; the organic matter content of 2 ~ 2.5% of the soil, the effect of phosphorus is not significant . Therefore, phosphate fertilizers should be applied preferentially to soils with low organic matter content. Second, to determine the soil quality determine the phosphate fertilizer in the neutral and calcareous alkaline soil, water-soluble superphosphate should be applied, superphosphate is weakly acidic, can neutralize the alkali in the soil; in the acidic soil should be applied weak alkali Calcium, magnesium and phosphate fertilizers. Applying alkaline phosphate fertilizer to acidic soil can not only enhance its fertilizer efficiency, but also neutralize the acid in the soil and avoid acid damage to the root system of wheat. Third, to see the effective phosphorus content of the soil Phosphate fertilizer should first meet the phosphorus deficiency field and Shoutian. Generally, the available phosphorus of the soil in the arable layer is lower than 5 to 10ppm, and the effect of using phosphorus fertilizer is most significant. The effective phosphorus content is about 20ppm, and the use of phosphorus fertilizer has certain effect of increasing production. The available phosphorus content is higher than 30ppm, and the use of phosphate fertilizer does not increase production obviously. Therefore, phosphorus fertilizers should be applied to wheat fields with effective phosphorus content below 15ppm, especially below 10ppm. 4. Phosphorus fertilizers are not widely used in stratified application of phosphate fertilizers, but wheat is mainly distributed in soil layers within 10 cm before a large number of secondary root winters. Therefore, 1/4 to 1/3 of the total phosphate fertilizer should be applied to shallow topsoil of 5 to 10 cm. Layers; 1/2 to 2/3 are applied in deeper layers of 15 to 25 cm. Take the planting before the ditch, plough base or seed dressing application, avoid ground surface. Fifth, phosphorus fertilizer and organic fertilizer mixed winter wheat variety of phosphorus fertilizer in a ratio of 1:10 and high-quality organic fertilizer mixed application, not only can reduce the contact surface of phosphorus and soil, and the organic acid fertilizer helps increase phosphate fertilizer The effectiveness of the phosphate fertilizer has greatly improved its effectiveness. In the middle and late period of spraying phosphorus fertilizer, in the middle or late stage of wheat growth, or in the absence of phosphate fertilizer, a small amount of superphosphate leaching solution can be sprayed on the wheat seedling stage, jointing stage and booting stage one or two times, ie, per acre. Each use of calcium superphosphate 1 ~ 1.5 kg, crushed into powder, add a suitable amount of water to soak a day and night, filter to take clear liquid, spray 50 to 60 kg of water. If you mix and spray 0.5 to 1 kg of urea and leaching liquor from plant ash, the effect of increasing production is better (Li Mei Han Xiuyun)