Abstract:

Field trials were carried out to investigate the effect of applied different concentration paclobutrazol on the growth, dry matter production in peanut in a subtropical region of south China. The paclobutrazol solutions were applied at full flowering stage of peanut. The results indicated that when 75-100 mg/L paclobutrazol was applied at blossoming stage, the growth of the main stems and branch stem were significantly inhibited, the amount of legume per plant and percentage of full legume were increased, and the peanut yield was also increased. Most of the growth parameters studied was affected by the concentration of paclobutrazol application. When the concentration of spraying paclobutrazol was increase among 0-100 mg?L-1, it would result in the significant increase of the peanut yield. The correlation analysis showed that the linear relationship between biomass and the pod yield were PP333:y=0.0240+0.3919x（r=0.0402），CK：y=0.2587+0.2680x（r=0.0485）. The relationship between the plant height and the fresh biomass were CK:y=0.0426+0.8411x(r=0.0070), PP333y= -0.1126+9.4824x(r= -0.0045). The experimental results demonstrate that spraying paclobutrazol more favoured the Peanut yield compared to CK, with seed-setting rate increase from 40% to 63%，the rate of plump pod increase from 9.00±3.62 to 21.33±2.84 per ,and the theoretical yields increase from 347.22±86.82 kg/666.7m2 to 723.08±76.38 kg/666.7m2，significant difference of the contro1. Thus the yield was greatly improved by spraying paclobutrazol with 75-100 mg/l PP333.