Single-point free infiltration characteristics of muddy water film hole irrigation with γ-PGA additive
CHEN Lin1, FEI Liangjun1, WANG ZiLu2, GUO Xin3, ZENG Jian1, YANG yang1
1.Institute of Water Resources and Hydro-electric Engineering, Xi′an University of Technology, Xi′ an, Shaanxi 710048, China; 2.Yellow River Institute of Hydraulic Research, Zhengzhou, Henan 450003, China; 3.Shandong Freda Biological Technology Co., Ltd., Jinan, Shandong 250101, China
In order to explore the effect of gamma-PGA on soil water infiltration and soil environmental improvement of muddy water film hole irrigation, we used the test of single-point free infiltration of muddy water Film Hole irrigation to study the soil water infiltration and water holding capacity with the different γ-PGA content being mixed with soil(0,0.1%,0.5%,1%). The results indicated that compared with treatment C, the cumulative infiltration volume of C1, C2, C3 were decreased by 17.27%, 30.91% and 42.73%, respectively. The constant infiltration rate of C1, C2, C3were decreased by 17.28%, 35.79% and 57.32%, respectively. But compared with treatment C, the saturated soil moisture content C1, C2, C3 were increased by 7.38%, 35.27% and 39.62%, respectively. The infiltration coefficient in Kostiakov formula reduced from0.132 8 to 0.070 7 and the infiltration index increased from 0.774 6 to 0.812 7. γ-PGA hindered the migration of vertical wetting front and led to keep the soil water in soil root water absorption layer. Butγ-PGA had no effect on the migration of horizontal wetting front and had propulsion function on horizontal movement of soil water. The treatment with 0.5% γ-PGA content was the best. In addition, γ-PGA could change the water distribution in soil profile. γ-PGA could concentrate water in the upper soil to satisfy the full water supply for crop seedling stage and improve irrigation water use efficiency.
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