Effects of Ground Film on Deep Percolation of Planting Soil for Cultivating Celery in Greenhouse
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Abstract:
In order to investigate the effects of different ground film forms on the deep percolation of cultivating vegetable in greenhouse, celery was chosen as the experimental sample, and four experimental groups with different ground film forms in the horizontal strip and U-shaped strip with different interval widths were designed in the study area and another group without ground film was also conducted for comparison. The variation process of soil moisture was measured by the PR1 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 ground film was calculated using the water balance equation, which can be used to determine the impacts of different ground film forms on the deep percolation. The results showed that under all types of ground film, the celery grows well and the deep percolation is reduced to some extent. The ground film 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 ground film form with smaller interval widths. After the ground film, 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 ground film when cultivating vegetable in greenhouse, but the optimal configuration parameters under various conditions need further experimental or numerical analysis.
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