Effects of controlled-release nitrogen fertilizer and bag-controlled release fertilizer on utilization of ~(15)N-urea in ‘Orin’ apple and its accumulation in soil
Taking a six-year old ‘Orin'apple tree plantation( ‘Orin'/SH6/Malus micromalus Makino) as test material,the effects of common urea treatment( CU),bag-controlled release fertilizers treatment( BCRF) and controlled-release nitrogen fertilizer treatment( CRNF) on~(15)N-urea absorption,utilization,loss and accumulation dynamics of nitrogen content in 0-80 cm soil layer were investigated by~(15)N labeled tracer method. The results showed that compared with CU treatment,both CRNF and BCRF treatments increased the...