Effect On System Environment And The Growth And Development By Subsoiling And Irrigation Times Of Springs Maize

Aiming at the shallow topsoil, poor structure and water scarcity of plain irrigation district in Inner Mongolia, taking Xianyu335 as materials, by studying the effect of subsoiling depth on root environment and growth of spring maize, analysis revealed the most reasonable subsoiling depth, to explore the efficient water-saving irrigation mode in the subsoiling depth conditions and to provide a theoretical basis for the study of water-saving and high yield cultivation techniques for plain irrigation district in Inner. The main findings are as follows:(1) Subsoiling 0-40cm and 60-100cm soil layer soil bulk density significantly reduced role, there’s no significant effect on the 40-60cm soil; subsoiling can significantly reduce soil compaction of 15-35cm soil layer, but irrigation has no significant effect on soil bulk density and soil compaction; compared with conventional shallow tillage, subsoiling can effectively improve the soil moisture of 40-100cm soil layer, and can improve water conditions of spring maize root and subsoiling 40cm is the optimum pine depth.(2) Subsoiling and irrigation frequency can increase root length, and the subsoiling 40cm+3 times irrigation water level increases the maximum length of the root mode. Subsoiling and irrigation could significantly increase the root dry weight of 30-80cm soil layer and root surface area of 0-40cm soil layer, respectively, the irrigation water 2 times and irrigation water one times reached the maximum amount of increase.(3) Subsoiling 40cm can significantly reduce the delay of SPAD value and Fv/Fm values, provide security source for spring corn yield, increase the amount of dry weig and grain filling rate. Subsoiling and irrigation can increase the corn leaf water use efficiency, and the subsoiling 40cm+irrigation water 3 times has the maximum increase. Subsoiling 30cm and 40cm can significantly increase the yield of spring maize. When subsoiling 40cm. irrigation water 3 times has the biggest increase in production, subsoiling 40cm+irrigation water 4 times made the highest yield.(4) Under the same irrigation frequency, subsoiling can increase production by 12.4% compared with conventional shallow tillage, even subsoiling 40cm+irrigation water 3 times can increase the yield of 3.5% than conventional shallow tillage 15cm+ irrigation water 4 times, and the average production units of corn saving an amount of 0.052 m3/kg, that is at once less irrigation water can reach the situation subsoiling tillage and conventional tillage fairly shallow production, achieve the purpose of saving water.