| In order to study suitable planting pattern of summer soybean to increase yield,the planting pattern（30 cm×6 cm（A）、40 cm×4.5 cm（B）、60 cm×3 cm（C）、（15+30）cm×8 cm（D）、（15+15+60）cm×6 cm）field test of summer soybean was conducted in 2016,studied on field micro environment and growth characteristics of summer soybean under different planting patterns,investigated effects of planting patterns on photosynthetic、matter production、grain filling characteristics and yield,the research aimed to provide a theoretical basis for selecting suitable planting pattern of summer soybean under high-yielding cultivation condition.The main results are as follows:1.Different planting patterns had a certain effect on the micro environment of summer soybean during the growing season.With reducing row spacing and plant spacing increasing,the soil moisture,canopy relative humidity increased,canopy temperature、soil temperature decreased.The soil water content and canopy relative humidity of wide narrow row planting pattern was 3.14%and 10.30%higher than that of the equidistant row.The canopy temperature and the soil temperature were felled by 4.27%and 1.49%.2.Leaf area index（LAI）,photosynthetic potential（LAD）,chlorophyll content（SPAD）,net photosynthetic rate（Pn）,transpiration rate（Tr）and stomatal conductance（Gs）of summer soybean under different planting patterns during determination period showed that the treatment of wide narrow row planting pattern higher than that of the treatment of equidistant row,but the intercellular CO2concentration（Ci）is just the opposite result.Among them,the highest treatment is wide narrow row planting pattern treatment D,the mean value of LAI,LAD,SPAD,Pn,Tr and Gs were higher than other treatments averaged by 15.63%,17.51%,9.11%,15.72%,28.90%,41.94%,and Ci decreased by 21.30%,it showed that wide narrow row planting pattern can enhance the photosynthesis of summer soybean.3.The dry matter accumulation per plant of summer soybean under different planting patterns in the whole growth period was treatment D>treatment E>treatment A>treatment B>treatment C.The dynamics of dry matter accumulation in different planting patterns were basically“S”curve.By using Logistic to simulate the dynamics of dry matter accumulation rule of different treatments,the traditional matter at the fastest growth period in advance and the maximum relative maximum growth rate of dry matter of treatment D is the biggest,0.68 g/Plant,the transportation of assimilation before anthesis and assimilation after anthesis of wide narrow row planting pattern treatment D is the highest,while pre anthesis assimilation transfer rate and contribution rate is the highest 20.82%and 29.18%.4.According to the different planting patterns of complex sowing soybean grain filling process of the Logistic equation,the maximum（K）value 100 grain weight of wide narrow row planting pattern treatment D was the highest,15.44g,respectively than treatment A,treatment B,treatment C,treatment D treatment increased by 13.25%,14.98%,23.32%,3.30%,grain dry matter accumulation and grain filling rate of each stage of wide narrow row treatment were higher than the other treatment,the average filling rate of wide narrow row planting pattern treatment D increased by 0.010.06 g grain-11 than the other treatment.5.The yield of wide narrow row planting pattern treatment D was the highest among different planting patterns,the yield reached 3 469.54 kg·hm-2,increased by 16.70%,26.92%,35.85%,2.43%than treatment A、treatment B、treatment C、treatment E.In addition,the pods numbers and kernel number of wide narrow row planting pattern treatment D respectively higher than the average of the other treatment increased by 20.26%and 12.66%,while the weight of 100 seed weight was 19.20%higher than that of other treatments,and reached the significant difference level,this was the direct cause of wide narrow row planting pattern treatment D increased yield. |
