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Date of Publication:2013-01-01

Journal:南水北调与水利科技

Affiliation of Author(s):建设工程学部

Volume:11

Issue:3

Page Number:160-164

ISSN No.:1672-1683

Abstract:In order to investigate the effects of different film placed under
   ground forms on the deep percolation of cultivating vegetable in
   greenhouse,celery was chosen as the experimental sample, and four
   experimental groups with different film placed under ground forms in the
   horizontal strip and U-shaped strip with different interval widths were
   designed in the study area and another group without film placed under
   ground was also conducted for comparison. The variation process of soil
   moisture was measured by the PRl layered moisture probe combining with
   the oven drying method. The time for irrigation was determined based on
   the observation data of soil moisture in the root layer. The automatic
   meteorological station was set up in the greenhouse to collect the
   meteorological data. The evapotranspiration of celery during the growth
   period was calculated using the energy balance method. The deep
   percolation for each type of film placed under ground was calculated
   using the water balance equation, which can be used to determine the
   impacts of different film placed under ground forms on the deep
   percolation. The results showed that under all types of film placed
   under ground, the celery grows well and the deep percolation is reduced
   to some extent. The film placed under ground in the U-shaped strip has
   better effects on reducing deep percolation that that in the horizontal
   strip and the effect of reducing deep percolation is better for the same
   film placed under ground form with smaller interval widths. After the
   film placed under ground, the time interval between irrigations
   increases, the total amount of irrigation and the frequency of
   irrigation reduce for most cases, and the deep percolation reduces by
   50% under the ideal situation. Consequently, the deep percolation can be
   reduced and irrigation water can be saved using the film placed under
   ground when cultivating vegetable in greenhouse, but the optimal
   configuration parameters under various conditions need further
   experimental or numerical analysis.

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