Understand the effects of planting density and spraying ethylene on soybean yield and quality to increase the yield of soybean under high-density cultivation. This study used Baodou 10 as the experimental material and set four cultivation densities: 225 000 plants/hm2 (D1), 240 000 plants/hm2 (D2), 255 000 plants/hm2 (D3), and 270 000 plants/hm2 (D4). Water (E0) and diluted 500 times ethylene (E1) were sprayed during the compound leaf stage of 4-5 soybean leaves to study the effects of planting density and ethylene on soybean photosynthetic characteristics, yield, and grain quality. The results showed that under higher density planting (D3, D4),the SPAD value and Pn of soybean leaves treated with E1 were better than those treated with E0; The plant height and internode length of E1 treatment decreased compared to E0 treatment; The yield level of E1 treatment increased by 6.51% and 30.19% compared to E0 treatment, respectively. In terms of soybean quality traits, the effect of spraying ethephon on the crude protein content of seeds was statistically significant (P<0.01), while the effect of planting density on the crude protein,crude fat,and isoflavone content of soybean seeds was statistically significant (P<0.01). Overall, when the planting density of Baodou 10 was 270 000 plants/hm2, spraying ethephon could improve the photosynthetic performance of leaves and stem traits, resulting in the highest yield.
Key words
planting density /
ethephon /
soybean /
net photosynthetic rate /
crude protein content /
soybean yields
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