Abstract:

To understand the chemical forms of phosphorus and the biological availability of phosphorus in tea garden soil, 35 samples of representative tea garden red soil were collected from Zhejiang Province, and the forms of phosphorus in soil were identified in detail, and compared with those in surrounding wasteland red soil. The results showed that inorganic phosphorus was the main phosphorus form in tea plantation red soil, and the average proportion of organic phosphorus and inorganic phosphorus in total phosphorus of the soil was 27.39% and 72.61%, respectively. The proportion of organic phosphorus in total phosphorus was positively correlated with the content of soil organic carbon. The organic phosphorus in tea garden red soil was mainly moderately active and moderately stable, and the proportion of highly stable and active organic phosphorus was relatively low. Meanwhile the occluded phosphate was the main inorganic phosphorus in the soil, followed by iron phosphorus and aluminium phosphorus, and calcium-bound phosphorus was relatively low. The proportions of Ca₂-P, Al-P and Fe-P in total phosphorus increased with the accumulation of soil phosphorus. The application of organic fertilizer could promote the formation of organic phosphorus, Ca₂-P and Al-P in tea garden red soil. Compared with wasteland red soil, tea garden red soil had higher organic phosphorus, Ca₂-P and Al-P. Soil available phosphorus was well correlated with Ca₂-P and Al-P.

Key words: Tea Garden Red Soil, Phosphorus Form, Organic Fertilizer, Parent Material, Available Phosphorus