| Increasing planting density is one of the important ways to increase maize yield.Corn varieties can adjust the root and root structure to adapt to the dense environment,increase production.Subsoiling can break the bottom of the plow to promote root growth,delay aging and improve maize yield.But there was a difference in the response of different varieties to density and loosening.Therefore,this study will combine the subsoiling and density to analysis the difference response to subsoiling between the tolerance of Chinese and foreign maize varieties and to explore the mechanism of subsoiling to maize density tolerance,in order to provide the theoretical basis for realizing increasing yield and efficiency by subsoiling and increasing density in Inner Mongolia plain irrigation area.In this experiment,we conducted the cultivation methodxplanting densityxvariety three-facto=r split test,and under the subsoiling 40 cm and 15 cm rotary tillage two fanning conditions,and two planting density,90000plants/hm2 and 105000plants/hm2 Comparative analysis the morphological,physiological and yield indexes of the aboveground and underground parts of six different blood maize varieties were Zhengdan 958 and Denghai 618,US Department of Xianyu 335 and Huamei No.?.Germany Department of KX3564 and KWS2564.The results show:(1)There was no significant difference in soil bulk density(0-40cm),soil compaction(0-60cm),soil water content(0-80cm),and soil water storage(0-80cm)in subsoiling tillage between the Europe and United States,China varieties.(2)Subsoiling significantly reduced the difference value of high and low density between soil moisture content(0-80cm)and soil water storage,and easing the soil moisture content and soil water storage of Zhengdan958,Denghai618,Huameil,Xianyu335,KWS2564 and KX3564,Which provides good soil conditions for species to develop close potential.(3)Subsoiling reduced the root dry weight,root length,root surface area and root volume difference of Huamei l,Xianyu335,KWS2564 and KX3564,and easing the density of the department of the United States and Department of German lines to bring the root changes.While the Department of Zhengdan958,Denghai618 had no significant difference.(4)Under the subsoiling and rotary tillage there were no significant differences in plant height,ear height and stem diameter between different cultivars,but the response of the tip of the leaf tip to subsoiling was decreased significantly by the presence of the tip of the tip of Denghai618 and Xianyu335.the Angle of the leaf tip of the KWS2564.KWS2564,KWS2564 and KX3564 has no significant on the subsoiling.(5)Subsoiling obviously eased the reduced range of photosynthetic rate,LAI and SPAD after increasing density of Huamei 1,KX3564.KWS2564.and Xianyu335,but the Zhengdan958 net photosynthetic rate,SPAD and denghai 618 SPAD effect is not obvious.(6)Subsoiling obviously reduced the difference value of root/shoot ratio to high and low density.and the Zhengdan 958,Denghai 618,Huamei 1,Xianyu 335,KWS2564 and KX3564 was reduced by 1.99%.2.42%and 2.85%.2.17%.2.39%and 2.01%respectively.The response of different cultivars to subsoiling was Huamei No.1>Denghai618>KWS2564>Xianyu 335>KX3564>Zhengdan 958.(7)In virtue of different varieties of coefficient of density resistance on the response of subsoiling showed significant differences.Under the subsoiling,the coefficient of density resistance of Zhendan 958,Denghai 618.Huamei 1,Xianyu335,KWS2564 and KX3564 were improved by 10.61%,21.39%,35.41%,69.19%,54.40%and 62.83%respectively.The response of different cultivars to subsoiling was Xianyu 335>KX3564>KWS2564>Huamei No.1>Denghai 618>Zhengdan 958.(8)Subsoiling obviously increased the difference value of yield to high and low density Under the subsoiling,The yield of KX3564.KY3525,KWS2564 was 805.64kg/hm2,787.52kg/hm2,894.2 lkg/hm2 and 859.86kg/hm2 respectivelxy.but Zhengdan958 and Denghai618 increased by 542.51kgi/hm2,433.14kg/hm2 respectively. |
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