NGHIÊN CỨU CÁC THÀNH PHẦN CỦA LÂN (PHOSPHATE FRACTION) TRONG ĐẤT TRỒNG CHÈ LÂU NĂM TẠI HUYỆN ĐỒNG HỶ, THÁI NGUYÊN

Đặng Văn Minh (trang 5-8, 18)

Từ khoá:  thành phần, lân, đất, chè, Đồng Hỷ, Thái Nguyên

Summary

Phosphate fraction in the long-term tea cultivated soils at Dong Hy district, Thai Nguyen province

Total P was higher in the cropped soils, as result of P fertilizer accumulation. High concentrations of NaOH extractable Pi (Fe and Al phosphates), together with low concentrations of plant available P in the cultivated soils suggests the P was being fixed. Ca-P and total organic P were also accounted for a large amount pf P, but as with the Fe and Al phosphates, they were nit available for plants. Organic P was tightly bound in organo-mineral complexes associated with strongly humified organic matter.