residual effect 第1页

EFFICIENCY OF NITROGEN IN NP COMPOUND ( MIXED ) FERTILIZERS Effect of topdressing nitrogen of intercropped maize strip on intercropped crop yields and soil nitrate nitrogen as well as its residual effect Residual effect of phosphorus fertilizer and phosphorus recycling in a farming system Ⅰ Phosphorus uptake by crops, residual effect of phosphorus fertilizer and changes of soil available phosphorus N and P balances in farmland ecosystem and their response to fertilizers