| Phosphorus is a non renewable resource.Excessive application of chemical phosphorus fertilizer is not only the main reason for low efficiency of crop phosphorus utilization,but also causes huge resource waste and environmental pressure.The northern foot of Yin Mountain is one of the most important potato producing areas in China.However,due to the unreasonable application of phosphate fertilizer and other improper management measures,the average utilization rate of phosphate fertilizer is only 11.2%in potato.Therefore,it is imperative to improve the utilization efficiency of phosphate fertilizer in potato production.Application of organic fertilizer is one of the important ways to achieve high yield of crops,soil fertility and crop quality.The area is rich in organic fertilizer resources.It is of practical significance to carry out organic and inorganic fertilizer application in potato production,which is expected to significantly reduce chemical phosphate fertilizer dressing and improve the utilization rate of phosphate fertilizer in potato production.The purpose of this study is to explore the technology of reducing application and increasing efficiency of phosphate fertilizer in potato planting system at the north foot of Yin Mountain in Inner Mongolia.Through two years of study,the following conclusions are drawn:(1)The yield,dry matter accumulation and phosphorus absorption of potato reduced when the chemical phosphorus fertilizer(240kg/ha)decreased 40%;the dry matter accumulation,phosphorus absorption and yield of potato recovered as supplementing organic fertilizer(4500 kg/ha and 9000 kg/ha)when 40%chemical phosphorus fertilizer decreased.(2)Based on the comprehensive analysis of phosphorus absorption and utilization efficiency,phosphorus balance in farmland and economic benefits,it is suggested that the recommended amount of organic fertilizer should be 4500kg/hm2 after 40%reduction of chemical phosphorus fertilizer in potato production at the north foot of Yin Mountain. |
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