| The dynamic change of soil water content in root zones of maize under localized supplies of water and nitrogen fertilizer |
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| DOI：10.7606/j.issn.1000-7601.2011.01.01 |
| Key Words: partial root-zone irrigation partial root-zone fertilization of nitrogen soil water content different root zones maize |
| Author Name | Affiliation | | HU Tiantian | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHANG Meiling | Institute of Survey and Design of Water Conservancy and Hydropower in Inner Mongolia, Hohhot 010020, China | | KANG Shaozhong | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling, Shaanxi 712100, China
Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China |
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| Abstract: |
| The soil water content in different root zones under localized supplies of water and nitrogen fertilizer was studied with maize grown in split-root containers. Maize was irrigated in both halves of the pot (C) or water was alternatively supplied to two halves of the pot (alternative partial root-zone irrigation treatment, A). Urea was applied to both halves of the pot (J) or was fertilized to one half of the pot while the other half was kept without N fertilizer (partial root-zone fertilization treatment, P), all with four
levels of fertilization, i.e. zero, low, medium and high. For J-fertilization, the soil water content (SWC) was the same for two root zones under C-irrigation while SWC of two root zones changed alternatively and SWC of the irrigated zone was always larger than that of the non-irrigated zone under A-irrigation, and this was more obvious after irrigation. For both C-irrigation and A-irrigation, N fertilization increased the residual SWC before irrigation. Moreover, both the increment and duration rose with N rates. For C irrigation, the residual SW
C in two root zones was equal under J-fertilization while the residual SWC of the fertilized zone was significantly larger than that of the non-fertilized zone under P-fertilization. Under A-irrigation and P-fertilization, both partial root-zone irrigation and partial root-zone fertilization caused the asymmetry of SWC in two root zones. Moreover, the effect of partial root-zone irrigation was larger than that of partial root-zone fertilization for low N rate and the early time after fertilization, and the effect of partial root-zone fertilization was larger than that of partial root-zone irrigation for medium and high N
rates and the late time after fertilization. Higher N fertilization could increase the capacity of soil water conservation for both two irrigation and two fertilization methods. |
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