| This article has been：Browse 1621Times Download 0Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2017.0453 |
|
| Main Performance of Moistube-irrigation System in the Yunnan Red Loam |
|
SONG Shiyu, YANG Haolin, XU Wenqi, ZHANG Yijie, YU Yang
|
|
College of Mechanical and Electrical Engineering，Yunnan Agricultural University， Kunming 650201， China
|
| Abstract: |
| 【Objective】 Research the main performances of moistube-irrigation system and provide the theoretical basis for moistube-irrigation technology in Yunnan red loam. 【Method】 Aimed at the Yunnan red loam, the effects of the irrigation pressure and the depth of moistube on soil moisture distribution and the wetting width of micro-irrigation system, which according to the lower limit of soil moisture content required for normal growth of crops, were studied and the growth of crops in different planting locations and acquisition lines were researched. 【Result】 There was a very significant interaction between the irrigation pressure and depth for flow (P<0.05). Wetted body was formed in the red loam and its cross-section was approximately oval when the irrigation water discharged through the moistube. The cross-section area enlarged with the increase of irrigation pressure and depth. Under the condition of different irrigation times, the width of infiltration at different positions of moistube showed the trend of “larger in the middle and smaller on both ends”, which was raised by 15.0%~33.6% in the middle section than those on both ends; After two weeks operation, the width of infiltration of moistube-irrigation system was tended to stabilize, and the average value of it ranged from 0.92 to 1.18 m. In crop growth test, the trend of crops’ height, stem diameter, fresh and dry weight of four kinds of crops showed the trend of “larger in the middle and smaller on both ends” on different acquisition lines. These results were in agreement with the result of the infiltration width test. 【Conclusion】 Under the conditions of 0.025 MPa irrigation pressure and the depth of 0.15 m, the closer the planting position of the crops, the better the growth of the crops. |
| Key words: Moistube-irrigation; Yunnan red loam; flow; soil moisture distribution; infiltrating range |
|
|
