Nitrogen Release Determination of Controlled Release Fertilizer (CRF)in Soil and Its Application
Zhang Changai
Zhang Yufeng
Lin Haitao
Qu Ling
Li Guandong
Xin Shurong
Abstract：The nitrogen release of sulfur coated urea (SCU),polymer sulfur coated urea (PSCU)and polymer coated urea (PCU)in soil during corn and wheat planting periods were determined by fertilizer packet burying method (FPBM).Combining the findings with other author’s research on crop’s fertilizer demand, the nitrogen release of controlled release nitrogen fertilizers and the fitting degree between crop’s nitrogen de-mand and fertilizer’s nitrogen release were analyzed.The results showed that the nitrogen release of PSCU, PCU and SCU in soil remarkably lagged than that in still water,and the release was slow at early stage but quick at later stage.The curve of nitrogen cumulative release in soil was close to a straight line during wheat planting period,i.e.,the release rate was relatively even in all stages.The fitting degree between corn’s ni-trogen demand and fertilizer’s nitrogen release of PSCU was the best;the fitting degree between wheat’s Nitro-gen demand and fertilizer’s Nitrogen release of PCU was the best.Thus,PSCU and PCU were suggested to be the optimized fertilizer for corn and wheat planting respectively,and on this base,topdressing nitrogen fertiliz-er should be the point for attention.
Keywords：Controlled release fertilizer (CRF)Nitrogen releaseSoilFertilizer packet burying meth-od (FPBM)Fitting degree
Publication Date：2015-09-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：6( 85-89,93 )