首页|The inlfuence of soil drying- and tillage-induced penetration resistance on maize root growth in a clayey soil
The inlfuence of soil drying- and tillage-induced penetration resistance on maize root growth in a clayey soil
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Soil drying may induce a number of stresses on crops. This paper investigated maize (Zea maysL.) root growth as affected by drought and soil penetration resistance (PR), which was caused by soil drying and tilage in a clayey red soil. Com-pared with conventional tilage (C) and deep tilage (D), soil compaction (P) and no-til (N) signiifcantly increased soil PR in the 0–15 cm layer. The PR increased dramaticaly as the soil drying increased, particularly in soil with a high bulk density. Increased soil PR reduced the maize root mass density distribution not only in the vertical proifle (0–20 cm) but also in the horizontal layer at the same distance (0–5, 5–10, 10–15 cm) from the maize plant. With an increase in soil PR in pots, the maize root length, root surface area and root volume signiifcantly decreased. Speciifcaly, the maize root length declined exponentialy from 309 to 64 cm per plant with an increase in soil PR from 491 to 3370 kPa; the roots almost stopped elon-gating when the soil PR was larger than 2200 kPa. It appeared that ifne roots (<2.5 mm in diameter) thickened when the soil PR increased, resulting in a larger average root diameter. The average root diameter increased linearly with soil PR, regardless of soil irrigation or drought. The results suggest that differences in soil PR caused by soil drying is most likely responsible for inconsistent root responses to water stress in different soils.
Key Laboratory of Arable Land Conservation Middle and Lower Reaches of Yangtze River, Ministry of Agriculture,Huazhong Agricultural University, Wuhan 430070, P.R.China
This study is supported by the National Natural Science Foundation of China
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