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United States Department of Agriculture (USDA 2010

INTERACTIONS OF VADOSE ZONE PROPERTIES AT MULTIPLE SCALES IN ARID LAND SOILS

Vadose Arid Land

United States Department of Agriculture (USDA) Research, Education & Economics Information System (REEIS)

Titre : INTERACTIONS OF VADOSE ZONE PROPERTIES AT MULTIPLE SCALES IN ARID LAND SOILS

Identification : NM-SHUKLA-H10

Pays : Etats Unis

Durée : Oct 1, 2010 à Sep 30, 2015

Domaine : Soil, Plant, Water, Nutrient Relationships ; Appraisal of Soil Resources ;

Partenaire : NEW MEXICO STATE UNIVERSITY 1620 STANDLEY DR ACADEMIC RESH A RM 110 LAS CRUCES,NM 88003-1239

Objectifs
The overall objective of this project is to quantify the interactions among soil physical, chemical and hydrologic properties and land use and management practices. Specific objectives are : 1) Study the linked nonlinear processes associated with water and energy balance near surface vadose zone ; 2) Quantify nitrate-N leaching though the root zone of some of the important crops of NM ; 3) Quantify the spatial variability of soil physical and chemical properties and identify the usefulness of Fuzzy K-mean analysis for delineating site specific management zones.

Descriptif
Objective 1 : Two sites will be instrumented with TDR units and temperature sensors at various depths (5, 10, 20, and 40 cm) and soil moisture content and soil temperature will be recorded every 30 min. The TDR sensors will be calibrated against gravimetrically collected volumetric soil water content. The arrival time for the wetting front at a depth will be denoted as the first indication of soil water content increase measured by TDR after an irrigation event. Changes in soil moisture content and velocity of propagation of the wetting front will be used for calculating the water flux throughout the unsaturated zone. Objective 2 : Soil samples will be obtained once a month at depths up to 100 cm from soil surface one-week after the irrigation for two consecutive growing seasons. Soil samples will also be collected at 150 and 200 cm depth from soil surface 3 months after planting and one week after the harvest of crop. A Titrino 798-A20 titration will be used to measure chloride and auto analyzer will be used to measure nitrate-N. The irrigation dates and amounts will be recorded for onions, chile and cotton planted at the Leyendecker Plant Sciences Research Center and leaching fractions and irrigation efficiencies will be estimated using modified chloride technique. Objective 3 : This study will be conducted at Leyendecker Plant Sciences Research Center (PSRC) and West Mesa site. The important difference between these two sites is that the later is irrigated with lagoon treated wastewater. Cores and bulk soil samples will be collected from each of the farm at a grid of 50 m X 50 m. Soil physical (bulk density, water retention, air-filled porosity, texture, infiltration rates, saturated hydraulic conductivity), and chemical properties (pH, EC, soil C and soil N) will be determined using standard methods. Additionally, sodicity and nitrate will also be determined for the West Mesa site. Statistical distributions will be described using descriptive statistics including mean, median, standard error, coefficient of variation, skewness, kurtosis, and interquartile range using the Statistical Analysis System. Data on soil physical and chemical properties will also be evaluated to identify soil quality indicators using factor analysis.

Présentation : USDA

Page publiée le 22 décembre 2015, mise à jour le 9 novembre 2017