The content of available phosphorus in soil is often an important indicator to determine the level of soil fertility. It reflects the size of the soil's ability to supply phosphorus. It is important to understand the content of available phosphorus in the soil to guide the application of phosphate fertilizer. Since the south of China is acidic soil and the north is alkaline calcareous soil, the method of measuring available phosphorus is not the same, and its standard is naturally different. The standard (mg/kg) of available phosphorus (P) in acid soil is: 0 to 15 is low; 16 to 30 is moderate; >30 is high. The standard (mg/kg) for available phosphorus (P) in calcareous soils is: 10 is high. When the soil available phosphorus content is low, it means that the soil is deficient in phosphorus or is seriously deficient in phosphorus, and the application of phosphorus fertilizer has obvious or extremely obvious effect; when the soil available phosphorus is medium, it shows that the application of phosphorus fertilizer has a certain effect; when the soil available phosphorus content is high At that time, it indicated that the soil was rich in phosphorus, and the effect of applying phosphate fertilizer was often not obvious. However, for high-yielding fields, although the available phosphorus content in soil is high, the principle of nutrient balance should also be taken into consideration. Therefore, it is necessary to apply a small amount of phosphate fertilizer appropriately. 1 The content of soil available P is obviously affected by the application of P fertilizer. With the large amount of P fertilizer applied every year, the soil available P content will gradually increase. Therefore, the amount of phosphorus fertilizer should be adjusted appropriately with the change of soil available phosphorus content. 2 Practice has shown that the combined application of nitrogen and phosphorus is conducive to crop yield increase. It can be seen that applying only phosphate fertilizer or partial application of nitrogen fertilizer is wrong, and the concept of nutrient balance should be established. Particularly Recommended Yellow Rice Wine Shaoshing Wine,Hua Diao Yellow Wine,Yellow Wine 20Years,Particularly Recommended Yellow Rice Wine ZHEJIANGGUYUELONGSHAN SHAOXING WINE CO.,LTD. , https://www.chinashaoxingwine.com
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