Table 1.
Background data of productivity and soil fertility of the experimental fields studied from 2011 to 2012.
Table 2.
Daily mean values of weather variables at experimental site during each of six months of the maize growing season from 2011 to 2012.
Table 3.
Results of ANOVA on the effects of year (Y), plant growth regulators (PGRs) on maize grain yield, yield components and ear shape.
Table 4.
Effects of different plant growth regulators on maize grain yield (t ha-1) and yield components from 2011 to 2012.
Table 5.
Effects of different plant growth regulator on internode length (cm) and internode diameter (mm) from 2011 to 2012.
Table 6.
Effects of different plant growth regulator on stem strength (N) from 2011 to 2012.
Table 7.
Effects of different plant growth regulator on leaf area per plant (cm2) and leaf dry weight per plant (g) from 2011 to 2012.
Fig 1.
Effect of different plant growth regulators on plant heigth and lodging percengage in 2011.
(A) Plant height. (B) Lodging percentage.Values are mean±SD. Same small letter on the bar indicates no significant difference at P<0.05 (LSD test).
Fig 2.
Effect of different plant growth regulators on chlorophyll content from 2011 to 2012.
Values are mean±SD. Same small letter on the bar indicates no significant difference at P<0.05 (LSD test).
Table 8.
Results of ANOVA on the effects of year (Y), plant growth regulator (PGRs) and sampling time (T) on chlorophyll content, chlorophyll fluorescence, enzymatic activity and lipid peroxidation.
Fig 3.
Effect of different plant growth regulators on chlorophyll fluorescence from 2011 to 2012.
(A) Primary fluorescence, Fo. (B) Maximum quantum efficiency of PSII photochemistry, Fv/Fm. (C) Actual quantum yield of PSII in light, Y(II). Values are mean±SD.
Fig 4.
Effect of different plant growth regulators on chlorophyll fluorescence from 2011 to 2012.
(A) Photochemical quenching coefficient, qP. (B) Non-photochemical quenching coefficient, qN. Values are mean±SD.
Fig 5.
Effect of different plant growth regulators on antioxidant enzyme activity from 2011 to 2012.
(A) Superoxide dismutase, SOD. (B) Peroxidase, POD. (C) Catalase, CAT. Values are mean±SD. Same small letter on the bar indicates no significant difference at P<0.05 (LSD test).
Fig 6.
Effect of different plant growth regulators on antioxidant enzyme activity from 2011 to 2012.
(A) Ascorbate peroxidase, APX. (B) Glutathione reductase, GR. Values are mean±SD. Same small letter on the bar indicates no significant difference at P<0.05 (LSD test).
Fig 7.
Effect of different plant growth regulators on lipid peroxidation from 2011 to 2012.
(A) Malondialdehyde content, MDA. (B) Hydrogen peroxide content, H2O2. Values are mean±SD. Same small letter on the bar indicates no significant difference at P<0.05 (LSD test).
Fig 8.
Effect of different plant growth regulators on osmotic substances from 2011 to 2012.
(A) Soluble protein content. (B) Soluble sugar content. Values are mean±SD. Same small letter on the bar indicates no significant difference at P<0.05 (LSD test).