In order to investigate the mechanism of the influence of soil texture, growing state and weather conditions on the root water uptake under various soil moisture conditions, the relationship between root water uptake rate and soil moisture content was used to evaluate soil moisture
availability and a Hydrus-1D model was used to analyzed the dynamic changes of root water uptake with various water content with maize growing with different leaf area index, root depth and root density distribution in three soil textural types (loam clay, clay loam and sandy loam) under three
weather conditions. Results showed that the root water uptake rate in various conditions remained constant until soil moisture content decreased below a critical value and then declined in a different way under different conditions with further soil moisture depletion. The critical values
were different for different soil texture, plant leaf area index and evaporative demand, among which root depth and root density distribution also had significant influence on the relationship between root water uptake and soil moisture content. However, the dynamic change of root water uptake
for maize to plant growing state and weather condition was different in the three soils. In general, the critical soil moisture content declined with soil texture in the order: loam clay > clay loam > sandy loam, increased as evaporative demand increasing and decreased as root depth
and root density distributed in the deep depth increasing. The effects of various factors on maize root water uptake decreased in the order: soil texture > root density distribution > root depth > evaporative demand > leaf area index.
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Keywords:
leaf area index;
model;
root depth;
root distribution;
root water uptake;
soil moisture;
soil textures;
weather condition
Document Type: Research Article
Publication date:
15 December 2011
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Transations of the Chinese Society of Agricultural Engineering(TCSAE), founded in 1985, is sponsored by the Chinese Chemical Society. TCSAE has been indexed by EI Compendex, CAB Inti, CSA. TCSAE is devoted to reporting the academic developments of Agricultural Engineering mainly in China and some developments from abroad. The primary topics that we consider are the following: comprehensive research, agricultural equipment and mechanization, soil and water engineering, agricultural information and electrical technologies, agricultural bioenvironmental and energy engineering, land consolidation and rehabilitation engineering, agricultural produce processing engineering.
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