微潤(rùn)灌溉下不同質(zhì)地土壤水分運(yùn)移及設(shè)施蔬菜生長(zhǎng)動(dòng)態(tài)研究
[Abstract]:As a new type of water-saving irrigation technology, micro-wetting irrigation can effectively improve soil environment, reduce soil evaporation and improve water use efficiency compared with traditional irrigation technology. Compared with drip irrigation, micro-sprinkler irrigation and sprinkler irrigation, micro-wetting irrigation can adjust water head and control water supply pressure to meet different crops. In this paper, indoor simulation experiments and three kinds of greenhouse vegetable planting experiments were carried out to explore the soil texture under different pressure water head, micro-wetting pipe outflow, wetting front migration and soil moisture distribution, and micro-wetting irrigation technology in water saving. The main conclusions of this study are as follows: 1. In the laboratory simulation test, the influence of water supply pressure on the cumulative infiltration and infiltration rate of micro-wetting pipe in soil is greater than that of ordinary irrigation. With the test time, the migration distance in the two directions is faster and then slower, and the migration rate decreases gradually. In one section of the wetting body, the moisture content of clay loam soil sample diffuses around the center of the micro-wetting pipe, and then decreases slowly. 2. In clay loam soil sample and mixed soil sample test, the moving distance of the wetting front in the vertical downward direction is larger than that in the other three directions. In sand tests, the horizontal and vertical migration distances of the wetting front are greater than those of the vertical direction, and the vertical downward migration distances are greater than those of the vertical direction. At the same distance from the micro-wetting pipe, the water supply pressure has a great influence on the soil moisture content; in the sand test, the water supply pressure has a little influence on the soil moisture content. In the sand experiment, the influence of water supply pressure on the moisture content of sandy soil is small. 3. In the greenhouse vegetable planting experiment, the daily average irrigation amount of vegetables increases first and then decreases. The vegetable plant height changed with the growth period, the seedling growth was rapid, then the plant height increased slowly, the plant height curve was "S" type. The treatment with 5 cm depth of embedding pipe was the most favorable for the growth of purple rape, with the highest yield and irrigation water productivity; the treatment with 2.0 m pressure water head and 8 cm depth of embedding pipe was the most favorable for the growth of Chinese cabbage, with the highest yield and the highest irrigation water productivity. 4. Except for the experiment with purple rape, the embedding depth of micro-embedding pipe was 8 cm and the water supply pressure was 2.0 M. In addition, in the vegetable experiment of this facility, the irrigation amount of vegetable under micro-wetting irrigation was less than that under ordinary irrigation, and the yield of vegetable under micro-wetting irrigation was higher than that under ordinary irrigation. The effect of saving water and increasing production can also increase the productivity of irrigation water.
【學(xué)位授予單位】:太原理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:S626;S275
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