Response of Photosynthetic Characteristics,Root Growth and Yield of Summer Maize to Subsoiling and Increasing Density in Lime Concretion Black Soil
In order to investigate the characteristics of changes in photosynthetic characteristics,root growth and grain yield of summer maize after subsoiling and density increasing in lime concretion black soil in the south of Huang-Huai-Hai region,a field experiment was conducted with two tillage methods(conventional rotary tillage and subsoiling tillage)and five planting densities(4.5× 104,6.0× 104,7.5×104,9.0× 104,10.5×104 plants/ha).The results showed that after subsoiling tillage,the light transmittances of ear position layer and bottom layer,net photosynthetic rate,transpiration rate and stomatal conductance increased by 14.8％,10.9％,9.0％,3.7％and 12.7％,respectively.The root dry weight,length and surface area increased by 19.6％,15.8％and 15.0％,respectively.The ear number,grain number per ear and 1000-grain weight increased by 1.4％,4.3％and 5.4％,respectively.The maximum yield was obtained under the planting density of 9.09x104 plants/ha,compared with conventional rotary tillage,the optimum planting density increased by 9.7％,and the average yield increased by 8.4％.Therefore,subsoiling tillage can improve the potential of increasing density and yield of summer maize in lime concretion black soil in the south of Huang-Huai-Hai.
NETL
NSTL
万方数据
