Effects of Plant Type Changes under Different Planting Density on Growth,Photosynthetic Characteristics and Yield of Peanut

Cheng Xiaowen; Peng Yanan; Gao Yuxi; Li Yuhan; Zhang Chaoqun; Gao Ruojun; Si Tong

doi:10.14083/j.issn.1001-4942.2025.03.006

Abstract：To clarify the effects of different plant type and planting density on peanut yield and select the suitable planting density and plant type,the peanut cultivar of"Qinghua 7"was used as material in the test.Split-plot design was used with three planting densities of 210 thousand(D1),180 thousand(D2)and 150 thousand(D3)plants per hectare for the main plots,and four plant type shaping treatments of non-pressing ring(T0),pressing ring of 50 mm in diameter(T1),pressing ring of 75 mm in diameter(T2),and pressing ring of 100 mm in diameter(T3)at the early blooming and pegging stage for the subplots.Two years of field experiment were conducted and the effects of plant type and planting density on growth characteristics and yield of peanut were studied.The results showed that increasing density promoted the vegetative growth and significantly increased leaf area coefficient of peanut,while inhibited the reproductive growth and decreased the net photosynthetic rate and chlorophyll content of peanut functional leaves.Shaping plant type by pressing ring inhibited the vegetative growth of peanut,decreased the net photosynthetic rate and chlorophyll content of peanut functional leaves,while promoted the reproductive growth.Shaping plant type by pressing ring played vital roles in coordinating vegetative growth and reproductive growth,and increased the storage capacity.Under the planting density of 210 thousand plants per hectare,the treatment of pressing ring of 50 mm in diameter(D1T1)had the highest peanut yield,while under the planting densities of 180 thousand and 150 thousand plants per hectare,the highest yield occurred under the treatment of pressing ring of 100 mm in diameter(D2T3 and D3T3).This conclusion could provide a theoretical basis for the selection of high-yield peanut plant types under different planting densities.