Autumn crops are mostly dry crops
Under dry conditions, the availability of phosphorus is low. After entering the winter, the activity of micro-organisms in the soil is weak. Phosphorus is small in volume, slow in rate and low in strength. At the same time, the soil water tension is large, and the mass flow and diffusion of phosphate are reduced. Phosphorus has a small displacement and its effectiveness is two to three times lower than that of rice under water conditions. In addition, some dry crops such as wheat crops originally belong to crops with poor response to phosphorus, while barley and wheat require more phosphorus during the returning green period and the tillering stage. Therefore, the sowing date of wheat crops emphasizes phosphorus application to meet the demand of phosphorus for the critical period.
Strong ability to fix phosphorus in dry soil
From the point of view of improving the stress resistance of autumn crops, after the autumn sowed crop is sown, the crops are susceptible to drought and freezing under conditions of less severe winter rain and low temperature, and the application of phosphate fertilizer can improve autumn conditions. The hydration and adhesion of the cell protoplasm during the wintering season of the sown crops will reduce the freezing point, thus improving the cold resistance and drought tolerance of the crops, and will help the winter sowing of crops in winter safely. In addition, the application of phosphate fertilizer for autumn sowing of winter green manure is not only the legume green manure itself is hi phosphorus crop, the application of phosphate fertilizer to strengthen the photosynthesis of plants, produce more carbohydrates, promote lush foliage, more accumulated material, but also Supply rhizobial growth and reproduction, enhance its nitrogen fixation.
Therefore, although it is not necessary to apply phosphorus to every season crop in the different cropping systems, it is necessary to consider that the crop should be applied mainly to crops that can maximize the effect of phosphate fertilizer, and autumn crops are the best choice for phosphate fertilizers throughout the year. Mouthwash.
Phosphorus fertilizer application method
Phosphate fertilizer should be mixed with various organic fertilizers or ammonium bicarbonate. When autumn sowing, acupoints and strips should be used as base fertilizer. The general dosage is 20-25 kilograms per mu, and the application depth is 6-10 cm. 3 to 5 kilograms of phosphate fertilizer plus 1 x dry fine soil dressing plant, the use of basal fertilizer and seed fertilizer, shallow and deep application combined method.
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