| In this experiment,the characteristics of soybean canopy and nutrient accumulation in maize and soybean intercropping were taken as the main research objects,and different maize-soybean row ratios were set to explore the effect of maize and soybean intercropping planting.In order to provide technical support for the coordinated development of maize and soybean production,this paper attempts to clarify the characteristics of soybean canopy and nutrient accumulation under the condition of maize-soybean intercropping,and optimize the pattern of planting proportion of maize-soybean intercropping.This experiment adopts the shadow-tolerant soybean cultivar Liaodou 32 and dense-tolerant maize Dongdan 6531 as test materials,maize-soybean row ratios were 2:2,2:3,2:4 and 2:5,interplanting canopy light interception and the photosynthetic characteristics was studied,and the influence of plant nutrient content and yield of soybean.The indicators measured in this test include the following parts: canopy light capture characteristics,photosynthetic characteristics,dry matter quality,nutrient accumulation,and mature yield.The main results were as follows:1.In every period of maize-soybean intercropping system by the corn shading fewer medial lines of soybean(east lines 2 and 3)grew better than the side nearest the corn lines of soybean(east line)1,more on the inside of the soybean,the plant height,stem diameter,high podding,balance,branch number,section number and LAI all nearly the CK(normal monoculture level),In each period,the same pattern is shown that side line is lower than the inside line,were lower than CK.2.Every period in different intercropping line ways light energy utilization was shown as: that side line is lower than the inside line,the test in the middle of the inclination angle in 25.32 to 42.32,the extinction coefficient increases with the process of growth period.In the intercropping mode processing,2:5 maize-soybean intercropping mode east 3 rows of soybean plant photosynthetic ability best,2:2 maize-soybean intercropping mode 1 row of soybean plant leaf photosynthetic capacity of the weak,The changes of net photosynthetic rate(Pn),stomatal conductance(Gs)and transpiration rate(Tr)were the same.The change trend of intercellular CO2 concentration(Ci)was opposite to that of net photosynthetic rate(Pn),stomatal conductance(Gs)and transpiration rate(Tr).Monoculture soybean(CK)at different development stages of the photosynthetic indexes was better than that of soybean intercropping mode.3.The content of nitrogen,phosphorus and potassium in the intercropping was different from that of plant.In the whole growth period,nitrogen accumulation was the highest in nitrogen and phosphorus,followed by potassium and phosphorus.Nitrogen,phosphorus and potassium content in the content of different interplanting mode trend was the same,slowly rising in R1,R3 phase content,content increased rapidly in R3-R6 stage,basic stability in the R6-the R8 stage.4.At the same time the interplanting mode in processing of soybean stem dry weight per plant,leaf dry weight per plant,pods per plant,grain dry matter weight per plant dry weight,all of the orders was 2:2 < 2:3 < 2:4 < 2:5 < CK.In the intercropping process,the yield of the third row in the east side of the 2:5 maize-soybean intercropping pattern was the highest,and the other processing output was lower with the 2:5 east 3 line than 3.29%,2.23%,0.83%,0.99%,0.47%,4.96% and 0.63%,respectively.In the treatment of different intercropping,the LER was the highest in 2:5 east 3 rows,and the other treatments were lower 8.28%,5.92%,1.78%,2.37%,1.18%,13.02% and 1.78%.In this experiment under the condition of different maize-soybean intercropping mode,In the 2:5 maize-soybean interplanting mode,in the point of soybean canopy characteristics,dry matter accumulation,nutrient content,and yield the 2:5 maize-soybean interplanting mode was the better choice for resource use. |
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