A5086171593- Irrigation Practices and Water Management
- Plant Water Relations and Carbon Dynamics
- Plant Disease Management Techniques
- Climate change impacts on agriculture
- Hydraulic flow and structures
- Soil and Unsaturated Flow
- Soil erosion and sediment transport
- Polymer-Based Agricultural Enhancements
- Water resources management and optimization
- Rice Cultivation and Yield Improvement
- Greenhouse Technology and Climate Control
- Nematode management and characterization studies
- Crop Yield and Soil Fertility
- Hydrology and Sediment Transport Processes
- Hydrology and Watershed Management Studies
- Soil Moisture and Remote Sensing
- Plant Pathogens and Fungal Diseases
- Horticultural and Viticultural Research
- Remote Sensing in Agriculture
- Flow Measurement and Analysis
- Water-Energy-Food Nexus Studies
- Plant Physiology and Cultivation Studies
- Plant responses to water stress
- Water Systems and Optimization
- Turfgrass Adaptation and Management
Agricultural Research Service
2014-2024
Agricultural Research Service - Plains Area
2008-2021
ORCID
2021
Soil Science Research Unit
2020
Conservation and Production Research Laboratory
2020
Fort Hays Tech Northwest
2020
Kansas State University
2020
University of Nebraska–Lincoln
2020
Oregon State University
2020
Trout Unlimited
2020
Realizing the full potential of drip irrigation technology requires optimizing operational parameters that are available to irrigators, such as frequency, rate, and duration water application placement tubing. Numerical simulation is a fast inexpensive approach studying optimal management practices. Unfortunately, little work has been done investigate accuracy numerical simulations, leading some question usefulness research design tool. In this study, we compare HYDRUS-2D simulations with...
The Root Zone Water Quality Model (RZWQM2) has been used widely for simulating agricultural management effects on crop production and soil water quality. Although it is a one-dimensional model, many desirable features the modeling community. This article outlines principles of calibrating model component by with one or more datasets validating independent datasets. Users should consult RZWQM2 user manual distributed along detailed protocol how to calibrate provided in book chapter. Two case...
Reflective bands of Landsat-5 Thematic Mapper satellite imagery were used to facilitate the estimation basal crop evapotranspiration (ETcb), or potential water use, in San Joaquin Valley fields during 2008. A ground-based digital camera measured green fractional cover (Fc) 49 commercial planted 18 different types (row crops, grains, orchard, vineyard) varying maturity over 11 Landsat overpass dates. L1T terrain-corrected images transformed surface reflectance and converted normalized...
Maize water production functions measured in a 4-year field trial the US central high plains were curvilinear with 2.0 kg m−3 productivity at full irrigation that resulted from 12.5 Mg ha−1 grain yields 630 mm of crop evapotranspiration, ETc. The show decreasing yield but relatively constant up to 25% ETc reduction. Water declined rapidly reductions greater than and was zero about 40% because 270 required produce first unit yield. These results corroborate those previous studies reduction...
ABSTRACT Strawberry fields in California (9,500 ha annually) are pre-plant fumigated with methyl bromide and chloropicrin to prevent serious soil pest disease problems. Although fumigation has ensured stability of strawberry production, its use is being discontinued because effect on stratospheric ozone. The likely short-term alternatives such as 1,3-dichloropropene, chloropicrin, metham sodium, although not ozone depleters, potentially hazardous the environment humans if applied improperly....
Canopy cover (CC) is an important indicator of stage growth and crop water use in horticultural crops. Remote sensing CC has been studied several major crops, but not most We measured 11 different annual perennial crops various stages on 30 fields the west side California's San Joaquin Valley with a handheld multispectral digital camera. was compared normalized difference vegetation index (NDVI) values calculated from Landsat 5 satellite imagery. The NDVI highly correlated linearly related...
Drip irrigation is more effective and less expensive if a large amount of soil can be wetted with each emitter without losing water or nutrients below the root zone. The distance that spreads horizontally from drip line volume are limiting factors determine spacing number lines emitters, frequency irrigation, thus cost irrigation. We used numerical simulations field trials to investigate effects application rate, pulsed application, antecedent content on spreading emitters. Simulation...
In California and other regions vulnerable to water shortages, satellite-derived estimates of key hydrologic fluxes can support agricultural producers managers in maximizing the benefits available supplies. The Satellite Irrigation Management Support (SIMS) project combines NASA's Terrestrial Observation Prediction System (TOPS), Landsat MODIS satellite imagery, surface sensor networks map indicators crop irrigation demand develop information products management use decisions. TOPS-SIMS...
Highlights Irrigation is key to the productivity of Great Plains agriculture but threatened by water scarcity. The irrigated area grew >9 million ha since 1870, mostly 1950, likely decline. Changes in climate, availability, area, and policy will affect productivity. Adaptation innovation, hallmarks populations, ensure future success. Abstract. Motivated need for sustainable management technology next-generation crop production, irrigation on U.S. was examined through lenses past...
Erosion from furrow irrigated land is a serious problem in southern Idaho and elsewhere the western United States. High molecular weight anionic Polyacrylamide (a water soluble polymer), increases soil aggregate stability flocculates suspended sediments, thereby reducing sediment detachment transport irrigation furrows. Application of 0.7 kg/ha/irrigation polyacrylamide has reduced erosion by 85 to 99%. In present work, movement infiltration were measured recirculating infiltrometer with two...
A study was conducted in the field on <i>Vitis vinifera</i> L. (cv. Thompson Seedless) to compare various measurements of vine water status under high-frequency drip irrigation. Water use at 100% evapotranspiration (ET<sub>c</sub>), determined with a weighing lysimeter. Vines vineyard were irrigated 0, 0.2, 0.6, 1.0, or 1.4 times amount used by lysimeter vines. applications occurred each time lost 16 L (2 mm depth; 8 vine<sup>−1</sup>). Soil content (𝛉<sub>v</sub>) measured and irrigation...
Slow infiltration rates constrain effective and economical irrigation in some sandy loam soils California. Polyacrylamide (PAM) has increased soil areas, especially high clay or silt. Field trials near Fresno, CA, with PAM failed to show improved infiltration. Laboratory experiments were conducted investigate effect on of various quality waters soils. Two formulations a molecular weight PAM, liquid emulsion granular, evaluated Hanford (coarse‐loamy, mixed, superactive, nonacid, thermic Typic...
ABSTRACT EFFECTS of basic water and soil interactions on erosion are reported. The effects flow rate slope perimeter shear stress outlined for channels in which the ratio breadth depth cross section stay reasonably constant. Effects resulting discussed terms coefficients equations developed several data sets. For furrows with a relatively constant to ratio, appears be related by an exponent varies between two four depending range cohesive forces holding particles underlying soil. sets...
Large, precision weighing lysimeters are expensive but invaluable tools for measuring crop evapotranspiration and developing coefficients. Crop coefficients used by both growers researchers to estimate water use accurately schedule irrigations. Two of this type were installed in 2002 central California determine daily rates potential (grass) develop better irrigation management vegetable crops. From 2006, the lysimeter was planted with broccoli, iceberg lettuce, bell pepper, garlic. Basal...
Maize water use was measured by balance in a 6-year field trial the west-central Great Plains of United States. Seasonal 102-day maturity class variety varied from 616 to 774 mm, with an average 666 mm. About 10% seasonal crop evapotranspiration drip-irrigated estimated be evaporation wet soil surface following precipitation or irrigation. averaged 68% tall (alfalfa) reference and 82% short (grass) evapotranspiration. Derived basal alfalfa-reference coefficients, Kcb, matched ASCE Manual...
In the face of declining water resources and climatic variability, growth stage‐based deficit irrigation may be a feasible approach to enhance agricultural system resilience. A 3‐yr experiment was conducted evaluate impact on maize ( Zea mays L.) in late vegetative (Lveg) maturation (Mat) stages, where phenology, dry leaf weight, aboveground biomass, yield, kernel number, 1000 grain‐filling rate were evaluated. Water during Lveg stage decreased number thus decreasing potential (less...