Preliminary studies on current input and recommended application amount of nitrogen,phosphorus,and potassium in Bingtang orange orchards in Xinping County
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1.College of Resources and Environment,China Agricultural University,Beijing 100000,China;2.Yunnan Chushi Agriculture Co.,Ltd.,Kunming 650000,China;3.Yunnan Green Food Development Center,Kunming 650000,China;4.Zhelong Agricultural and Rural Comprehensive Service Center,Yuxi 653400,China;5.College of Resources and Environment,Southwest University,Chongqing 400715,China;6.College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,China

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S666;S147

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    Abstract:

    A combination of the field survey and the collection and analysis of soil/fruit sample was conducted in 70 Bingtang orange orchards in Xinping County to clarify the current input of nitrogen,phosphorus,and potassium in orchards in Xinping County. The status of fertilization practices,available nutrient in soil,and nutrient removal of fruit in different Bingtang orange orchards in the county was investigated. The recommend amount of fertilizer for orchards was studied based on the yield. The results showed that orchards in Xinping County were fertilized 2-4 times throughout the year,with the main fertilization being 3 times,mainly concentrated in February-March,May,and December. The average input of nitrogen (N),phosphorus (P2O5),and potassium (K2O) in the county was 444.43,407.07,507.35 kg/hm2,respectively,with an input ratio of 1∶0.92∶1.14. The soil pH value and average content of organic matter was 6.08 and 17.97 g/kg,respectively,generally at an appropriate level. The average content of alkaline hydrolyzed nitrogen in orchards was 74.43 mg/kg,generally at a deficiency level. 78.26% of orchards had lower content of alkaline hydrolyzed nitrogen. The average content of available phosphorus and available potassium in orchards was 91.57 and 245.05 mg/kg,generally at a high level. More than 50% of orchard had high content of available phosphorus/potassium in soil. The potential for reducing the application of nitrogen,phosphorus,and potassium in the Bingtang orange orchards in Xinping County was 8.53%-70.31%,56.95%-87.35%,and 33.64%-78.69%,respectively. According to the removal and utilization efficiency of nutrient in orchards,the recommended amount of nitrogen,phosphorus,and potassium for orchards with different yield levels is 82.39-386.80 kg/hm2,33.89-163.59 kg/hm2,and 69.20-299.25 kg/hm2,respectively. It is indicated that the large input of fertilizer in the Bingtang orange orchards in Xinping County has caused a surplus of nutrients in soil. Targeted fertilization should be applied to Bingtang orange orchards in Xinping County with different production capacities through increasing the input of organic fertilizer and optimizing application structure of fertilizer.

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陈梦昕,蒋正品,李永平,李有荣,张朝春,张跃强,胡承孝,董治浩. Preliminary studies on current input and recommended application amount of nitrogen,phosphorus,and potassium in Bingtang orange orchards in Xinping County[J]. Jorunal of Huazhong Agricultural University,2023,42(6):96-105.

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History
  • Received:June 19,2023
  • Revised:
  • Adopted:
  • Online: December 12,2023
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