Dimensional Interference Infiltration Characteristics Of Biogas Slurry Irrigation Hole

In order to investigate the water movement interference infiltration characteristics of biogas slurry hole irrigation,I carried out the experiment at water conservancy engineering laboratory of Energy and Power Engineering,Lanzhou University of Technology, this paper did a lot experiments to explore the effects of different concentration of Biogas slurry(1∶4,1∶6,1∶8,CK) and different soil hole diameters on water movement interference infiltration characteristics in the laboratory. Through the analysis of the recorded and observed data have obtained the following results.Water migration features in soil :(1)The results showed that the biogas slurry concentration increased with the cumulative infiltration at the same infiltration time,showed a trend of 1∶4< 1∶6< 1∶8< CK, and increased with Soil bulk density showed a trend of1.40g·cm-3< 1.35g·cm-3. The cumulative infiltration increased with the increase of soil hole diameters,with soil bulk density decreases.(2)Kostiakov infiltration model can describe the relationship of the cumulative infiltration increases with the increase of the infiltration time, the correlation coefficient R2 for all treatments is larger than 0.99.(3)While the soil water infiltration rate decreased with the increase of infiltration distance under the condition of the same biogas slurry concentration. The higher Biogas slurry concentration,the lower infiltration rates at the same diameter and infiltration distance. Infiltration rates increased gradually with the increase of soil hole diameters at the same infiltration position. Infiltration rates increased gradually with the decreases of soil bulk density at the same infiltration position.(4)The area of soil water content which is greater than or equal to 22% increased with the increase of soil hole diameter and with soil bulk density decreases,that area also increased with the decrease of biogas slurry.Nutrients migration features in soil :(1)The slurry used in the test itself with a low phosphorus content, after the slurry infiltration soil phosphorus content than the original soil did not significantly improved, even if there are some fluctuations nor is there any law. In soil bulk density 1.35 g·cm-3 and concentration of biogas slurry is 1:4 the phosphorus content of the soil from the 6 mg / kg to 14 mg / kg fluctuation; In soil bulk density 1.35 g·cm-3 and concentration of biogas slurry is 1:6 the phosphorus content of the soil from the 7mg / kg to 16 mg / kg fluctuation; In soil bulk density 1.35 g·cm-3 and concentration of biogas slurry is 1:8 the phosphorus content of the soil from the 6mg / kg to 16 mg / kg fluctuation.(2)Nitrogen content and potassium content than the original soil content has improved so much. The initial soil nitrogen content in the 30mg/kg to 90mg/kg, the biogas slurry after infiltration holes around the maximum nitrogen content of up to 320 mg/kg; the initial soil potassium content in the 50mg/kg to 150mg/kg, the biogas slurry after infiltration holes around the maximum potassium content of up to 3000mg/kg.(3)Nitrogen, potassium accumulate a lot around the hole soil, and with the infiltration distance decreases, in agreement with the original soil wetting front office; nitrogen and potassium in the vertical the migration is greater than the horizontal migration; nitrogen, potassium content increases as the diameter of the bore hole increases, with the slurry concentration increases, as the soil bulk density increases.