Effects of different rates of phosphorus application in Harumi tangor orchard of al-kaline purple soil in Nanchong,Sichuan,China
In order to explore the appropriate phosphorus application rate for the green and high-quality pro-duction of Harumi tangor in alkaline purple soil in Nanchong City,Sichuan Province,7-year-old Harumi tangor on Citrus junos rootstock was used as test material.Under the conditions of the same annual application of ni-trogen fertilizer(urea,350 g·plant 1·year-1in terms of N)and potash fertilizer(347 g·plant-1·year-1 in terms of K2O),different rates of phosphorus fertilizer(calcium superphosphate,P2O5,61,92,125,154,180,215 g·plant-1·year-1)treatments were applied to compare the root vigor,soil enzyme activity and fruit in-trinsic quality of Harumi tangor,and evaluate the comprehensive effect of different treatments by principal component analysis.The results showed that with the increase of phosphorus application,the root vigor in-creased and then decreased,the effective phosphorus content in soil increased and then decreased,the activities of both alkaline phosphatase and sucrase increased and then decreased,but the changes of soil urease activity were not regular.The effect of phosphorus application rate on the activity of soil catalase was not significant.The soluble solid content of fruits decreased in general,the content of titratable acid decreased and then in-creased,the solid-acid ratio increased in general,and the vitamin C content decreased at first and then in-creased.Among the treatments,180 g·plant-1·year-1 treatment had the best overall effect.
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