Effect of controlled-release fertiliser on yield and its component of summer maize.

CCF, common compound fertiliser; CRF, a resin-coated CRF; SCF, a sulphur-coated CRF.CCF, applied at 1250 kg ha−1 (the local average commercial fertiliser N application rate); CRFI, CRF applied at 714.29 kg ha−1 (50% CCF), CRFII,1071.43 kg ha−1 (75% CCF), CRFIII, 1428.57 kg ha−1 (100% CCF); SCFI, SCF applied at 833.33 kg ha−1 (50% CCF), SCFII, 1250 kg ha−1 (75% CCF), SCFIII, 1666.67 kg ha−1 (100% CCF); CK, control plots without N application.Yield component of summer maize includes rows per ear, kernels per row, kernel No. per ear and Wt. per 1000-kernel.According to the average market price at present, that is 1911 yuan t−1 for maize, 2190 yuan t−1 for CCF, 2660 yuan t−1 for CRF, 2350 yuan t−1 for SCF.All data are means of 3 replications.Means values marked with different capital letters indicate significant differences at P = 0.01 level; different small letters indicate significant differences at P = 0.05 level.