4. College of Agronomy and Life Sciences,Zhaotong University,Zhaotong 657000,China;Yunnan Engineering Research Center of Green Planting and Processing of Gastrodia Elata,Zhaotong 657000,China
Kiwifruit industry is an important industry in Weixin County,and it is important to grasp the situation of each nutrient in the soil of kiwifruit orchards in Weixin County for the development of a reasonable fertilization program to effectively improve the yield and quality of kiwifruit.In this study,five representative orchards in Weixin County were used as research objects to test and analyze the pH,organic matter,total nitrogen,alkaline dissolved nitrogen,quick-acting phosphorus and quick-acting potassium contents of orchard soils.The results showed that the pH value of the five orchards ranged from 7.36 to 7.83,which was neutral and weakly alkaline;the organic matter content of the soils ranged from 60.5 to 66.3 g/kg,which was at the extremely rich level;the total nitrogen content ranged from 2.92 to 3.12 g/kg,which was at the extremely rich level;the alkaline nitrogen content ranged from 78.40 to 187.60 mg/kg,which was at the extremely rich level;the quick-acting phosphorus content ranged from 1.5 to 2.5 g/kg,which was at the extremely rich level;and the quick-acting phosphorus content ranged from 0.5 to 0.5 g/kg.The alkaline dissolved nitrogen content ranges from 78.40 to 187.60 mg/kg,which is the extremely abundant level;the quick-acting phosphorus content ranges from 21.28 to 37.80 mg/kg,which is the high level of the second grade;and the quick-acting potassium content ranges from 414.00 to 512.00 mg/kg,which is the extremely abundant level.The distribution of soil organic matter and total nitrogen was more consistent and less affected by external factors,while alkaline dissolved nitrogen,quick-acting phosphorus and quick-acting potassium were more different due to different fertilization habits and dosages.The soil nutrients of kiwifruit orchards in Weixin County were sufficient overall,and in future management,soil pH should be appropriately lowered,organic fertilizers and phosphorus fertilizers should be increased,and nitrogen fertilizers and potassium fertilizers should be maintained in their dosages.
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