Effect of different densities of single-seed sowing on flowering dynamics and fruiting characteristics of peanut
To improve peanut yield,density effect of single-seed sowing was explored on flowering dynamics and fruiting characteristics.A common large peanut variety Huayu 25 was used as material,4 treatments of single-seed sowing of 278 000 plants·hm-2(S9,plant spacing 9 cm),208 000 plants·hm-2(S12,plant spacing 12 cm),167 000 plants·hm-2(S15,plant spacing 15 cm)and double-seed sowing of 278 000 plants·hm-2(D18,plant spacing 18 cm)were set under the same row spacing.Differences were investigated on flowering habits,needle formation,pod development dynamics,pod setting range and yield of peanut.Results showed that different densities of single-seed sowing could all promote peanut early flowering,with more flowerings.They increased the number of effective nee-dles and promoted pod development to different degrees.The effect was most obvious under low density conditions.From the perspective of population indicators,under single-seed precision sowing mode of 208 000 plants·hm-2,peanuts have the highest number of flowerings,effective needles,and pods,the largest pod volume,pod fullness,and the highest yield level.Different densities of single-seed sowing changed pod setting range and pod spatial dis-tribution of peanuts.The pod setting range increased with the decrease of density.However,most of the pods(more than 95%)in each treatment were still distributed within the spatial range of 6.0 cm radius.Under single-seed sow-ing of 208 000 plants·hm-2(plant spacing 12.0 cm),the pod setting range was close to half of plant spacing which was more conducive to uniform distribution of pod among populations.
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