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The Study on the Character of Water and Salt Distribution in Soil under Field Drip Irrigation

Author: JuLong
Tutor: WangQuanJiu
School: Xi'an University of Technology
Course: Agricultural Soil and Water Engineering
Keywords: Single emitter drip Drip irrigation Salt Transport Optimal irrigation
CLC: S275.6
Type: Master's thesis
Year: 2007
Downloads: 354
Quote: 2
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Abstract


Drip irrigation development and utilization of saline-alkali soil in Xinjiang and secondary prevention and treatment of saline been applied, but for a reasonable guide agricultural production patterns and irrigation to wash salt regime, there are still many expect improvement. In this paper, based on research results from home and abroad, through field tests on red grapes drip irrigation for soil water infiltration and evaporation salt distribution were studied, the following conclusions: (1) single drip emitter surface plot Water radius, horizontal infiltration wetting front and between the time there were a significant power function; small emitter flow, irrigation lasted longer are conducive to vertical pressure salt. Evaporation conditions, film processing in the 20-30cm soil moisture increased, increased salinity maximum value here; does not appear in the surface coating treatment 0-10cm depth of soil salt accumulation serious. (2) red grapes under Drip Irrigation, Drip irrigation quota below the soil water content and is proportional to its salt content is inversely proportional to the increase with soil depth was significantly decreased; dripper irrigation quota on the junction of two adjacent soil water content was less affected, but a significant effect on the salt content. Film processing in the horizontal direction at 60cm from the emitter surface soil salt content was significantly higher than that film, film processing and 40cm at the salinity is much lower than the non-coated treatment, as the depth increases, difference becomes smaller. Red grapes growing period, the average soil moisture coated handle a maximum appears in the horizontal direction away from the emitter at 30cm; salinity maximum occurs at a distance of 30-60cm at the emitter. Irrigation cycle longer film on the impact of soil moisture is more significant; irrigation quota equal, the irrigation cycle is three days of treatment on soil salinity better leaching. (3) evaporation of eight days, the average moisture content max laminating process appears in the horizontal direction at 60cm away from the dropper. Dripper 0-30cm away from the salt content of the soil remained basically unchanged, film processing horizontal direction from the dripper 60cm at significantly increased soil salinity; (4) after the end of growth period irrigation soil moisture was significantly lower than the initial moisture content. With all the processed soil salinity increasing distance from the emitter increasing trend, leaching of soil salinity and irrigation cycles are inversely proportional. Film processing and irrigation cycle for 3-day treatment is not covered in the horizontal direction from the dripper 60cm no salt accumulation within the case. (5) integrated soil moisture, salt and inhibiting factors such as yield derived irrigation period of 3 days, irrigation quota 209m 3 · hm -2 of the coating process for the 2005 best suited to local conditions of irrigation schemes.

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CLC: > Agricultural Sciences > Agricultural Engineering > Irrigation and water conservancy > Irrigation technology > Drip irrigation
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