Abstract:

In order to reveal the effect of PBOG on yield and yield-related traits of soybean, and to investigate its suitable application concentration, we chose the sub-limited podding habits soybean variety ‘Kenfeng 16’ as the material, and conducted foliar spray with five different concentration gradients of PBOG: 0, 0.5, 1, 2 and 3 g/L at the early flowering stage of soybean. The effects of PBOG on soybean plant height, node number of main stem, bottom pod height, number of effective pods, kernel number per plant, 100-kernel weight and yield were investigated. The results showed that the plant height and bottom pod height decreased the most and significantly at PBOG concentration of 3 g/L, with a decrease of 41.9% and 44.1%, respectively; while 100-kernel weight reached the maximum of 19.05 g at this concentration, with an increase of 13.3%. The node number of main stem, number of effective pods, and kernel number per plant increased significantly at PBOG concentration of 1 g/L. The yield showed a trend of first increase and then decrease with the increase of PBOG concentration, with the maximum increase of 21.6% at the concentration of 1 g/L, and then gradually decreased, and was lower than that of control at 3 g/L. In conclusion, the optimum application concentration of PBOG is 1 g/L for the sub-limited podding habits variety ‘Kenfeng 16’, the yield can be increased by 21.6% at this concentration, and the lower plant height can improve the lodging resistance.

Key words: soybean, concentration of PBOG, plant height, yield, yield trait