Research of Soil and Water Conservation. 2014, (05) Core

Effect of Different Drip Irrigation Schedule under Mulch on Root Distribution of MaizeChinese Full Text

XU Bao-shan;JIA Sheng-hai;LUO Tian-feng;JIN Jian-xin;School of Engineering,Gansu Agricultural University;Gansu Research Institute for Water Conservancy;

Abstract: Distribution of maize roots is affected by many factors which have the greatest impact on soil moisture and growth stage.This paper analyzed the conditions under different irrigation schedules and different growth stages,the relationship of soil depth with the root length density and root weight density,studied the drip irrigation maize roots for different irrigation schedules the root distribution of all growth stages.Root length density and root weight density of representative maize was calculated by using the data measured in field trials.The results showed that the root length presented an increasing trend in the surface soil with the water stress reduction,it was contrary in the deep soil layer,and the maximum roots depth was 80 cm,at the big horn stage,root length density of treatment 1appeared minimum at 20 cm soil layer（77.27mm/cm3）,treatment 9appeared maximum（143.31mm/cm3）in 40 cm soil depth,root length density of treatment 8was minimum（16.11mm/cm3）,treatment 1is maximum（24.89mm/cm3）.Root weight density is consistent with the pattern of the root length density,water stress can promote root to stretch to depths,at the jointing stage,proportion of root dry weight to total root dry weight of treatment 1in 0—20cm soil layer is only 67.9%,90.2%for the treatment 9in 0—20cm soil layer,with the growth period progresses,the root weight density rose with the increase the irrigation volume in the surface,at the big horn stage,root weight density of treatment 1is 8.16×10-4 g/cm3,treatment 7is 2.358×10-3 g/cm3.Water stress makes roots grow in deep soil to absorb water for compensating the deficience,but roots will become fine and smal-ler,showing that the roots will make their adaptability to environmental adjustment under water stress and balance the important mechanisms.

Keywords：

drip irrigation; corn roots; distribution; soil moisture;

DOI：
10.13869/j.cnki.rswc.2014.05.049
Series：
Subject：
Classification Code：
S513;S275.6

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Effect of Different Drip Irrigation Schedule under Mulch on Root Distribution of MaizeChinese Full Text

XU Bao-shan;JIA Sheng-hai;LUO Tian-feng;JIN Jian-xin;School of Engineering,Gansu Agricultural University;Gansu Research Institute for Water Conservancy;

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