微润灌条件下播前深松耕技术对夏玉米生长及产量的影响

Effects of subsoiling before sowing on growth and yield of summer maize under moistube-irrigation

为探明微润灌下深松耕对夏玉米生长及产量的影响,采用完全随机试验设计,分析微润灌溉下不同水分调亏与深松耕深度对夏玉米的株高、茎粗、干物质积累、产量及水分利用效率的影响。研究结果表明:随深松耕深度的增加,夏玉米株高、茎粗、地上与地下干物质质量、穗长、穗粗、穗重、禿尖度与产量在一定范围内呈增加趋势,灌溉水分利用效率呈减小趋势。随微润灌灌水下限的增加,夏玉米株高、茎粗、地上与地下干物质质量、穗位高、穗长、穗粗、产量均呈增加趋势,穗重则呈先增加后减小趋势,灌溉水分利用效率呈减小趋势。综合考虑,微润灌灌水下限保持60%田间体积含水率与深松40cm为最优处理。该研究对微润灌溉技术的推广及应用具有指导价值。

In order to research the effect of subsoiling on the growth and yield of summer maize under moistube-irrigation,this study sets a completely random experimental design to analyze the effects of different water deficit irrigation and subsoiling depth on the plant height,stem diameter,dry biomass,yield and water use efficiency of summer maize under moistube-irrigation.The results showed that the plant height,stem diameter,aboveground and underground dry biomas,spike length,spike diameter,spike weight,bald tip and yield of summer maize showed an increasing trend with the increase of subsoiling depth within a certain range,while irrigation water use efficiency showed a decreasing trend.With the increase of the lower limit of moistubeirrigation,plant height,stem diameter,aboveground and underground dry biomass,spike height,spike length,spike diameter and yield of summer maize all showed an increasing trend,while spike weight first increased and then decreased,and irrigation water use efficiency showed a decreasing trend.In conclusion,the optimal treatment was 60%field volume water content of the lower limit with moistube-irrigation and 40 cm subsoiling.This study has guiding value for the popularization and application of moistube-irrigation technology.