A5074116987- Irrigation Practices and Water Management
- Research in Cotton Cultivation
- Rice Cultivation and Yield Improvement
- Soybean genetics and cultivation
- Smart Agriculture and AI
- Remote Sensing in Agriculture
- Plant Water Relations and Carbon Dynamics
- Crop Yield and Soil Fertility
- Agronomic Practices and Intercropping Systems
- Remote Sensing and LiDAR Applications
- Greenhouse Technology and Climate Control
- Legume Nitrogen Fixing Symbiosis
- Soil Moisture and Remote Sensing
- Soil and Unsaturated Flow
- Genetics and Plant Breeding
- Soil and Water Nutrient Dynamics
- Soil erosion and sediment transport
- Water resources management and optimization
- Plant responses to water stress
- Sugarcane Cultivation and Processing
- Hydrology and Watershed Management Studies
- Agricultural Engineering and Mechanization
- Soil Geostatistics and Mapping
- Climate change impacts on agriculture
- Soil Carbon and Nitrogen Dynamics
Quality Research
2011-2023
Agricultural Research Service
2007-2023
United States Department of Agriculture
2016-2022
Delta Air Lines (United States)
2005-2022
Phylogeny (United States)
2018
University of Missouri
2005-2017
Mississippi Delta Community College
2016
University of Arkansas at Fayetteville
1990-2003
University of Tennessee at Knoxville
1987
Soil properties and weather conditions are known to affect soil N availability plant uptake; however, studies examining response as affected by sometimes give conflicting results. Meta‐analysis is a statistical method for estimating treatment effects in series of experiments explain the sources heterogeneity. In this study, technique was used examine influence parameters on corn ( Zea mays L.) across 51 involving same rate treatments that were performed diversity North American locations...
Nitrogen available to support corn ( Zea mays L.) production can be highly variable within fields. Canopy reflectance sensing for assessing crop N health has been proposed as a technology base side‐dress variable‐rate application. Objectives of this research were evaluate the use active‐light crop‐canopy sensors need, and derive fertilizer rate that would return maximum profit relative single producer‐selected application rate. A total 16 field‐scale experiments conducted over four seasons...
As population density (POP) increases in a soybean [Glycine max (L.) Merr.] crop, maximum light interception (LI) occurs earlier the season. Earlier canopy closure would be expected to increase cumulative radiation intercepted. We hypothesized that if use efficiency (RUE) was constant across range of densities nonstressful environment, then increasing POP biomass at end To test this hypothesis, we evaluated response total produced during season intercepted photosynthetically active (PAR)...
Glyphosate [ N ‐(phosphonomethyl)glycine] inhibits 5‐enolpyruvylshikimate‐3‐phosphate synthase, EC 2.5.1.19 (EPSPS), thereby blocking aromatic amino acid synthesis. While glyphosate‐tolerant (GT) soybean Glycine max (L.) Merr.] contains resistant EPSPS, the 2 ‐fixing symbiont in root nodules, Bradyrhizobium japonicum , does not contain a enzyme, and glyphosate spray to GT may interfere with symbiotic relationship. Glyphosate‐tolerant was treated at several different stages of development...
ABSTRACT Wind erosion researchers need field equipment and techniques for ascertaining threshold wind velocities the amount vertical distribution of eroded soil particles. To detect moving particles erosion, sensors samplers to measure surface creep airborne have been developed. A power expression will describe variation in amounts suspended material a 2-m height. The quantity (f) height (y) within saltation zone can be explained by f = fo(l-y/a)P where fo is creep, below which 50% total...
Abstract. Accurate estimation of crop yield before harvest, especially in early growth stages, is important for farmers and researchers to optimize field management evaluate performance. However, existing in-field methods estimating are not efficient. The goal this research was the performance a UAV-based remote sensing system with low-cost RGB camera estimate cotton based on plant height. UAV acquired images at 50 m above ground level over first flower stage. Waypoints flight speed were...
Short‐season soybean [ Glycine max (L) Merr.] production systems, such as double cropping and late sowing, require high populations to optimize yield, but effects of on seed number mass are unknown. We evaluated plant population yield compensation, stability harvest index, assimilate partitioning for number, seed‐filling characteristics 2 yr near Keiser, AR. The study had two cultivars, levels irrigation, three row spacings that each five ranging from 6 134 plants m −2 Increasing reduced per...
Soybean [Glycine max (L.) Merr.] production systems that utilize short-season cultivars for double cropping and late sowing often have insufficient time to establish a complete canopy prior reproductive development. Our objectives were evaluate plant population as tool manage crop growth, maximum biomass (BM), the required closure, yield. Field tests sown on 8 July 1997 26 June 1998 at Keiser, AR (35° 67' N, 90° 83' W) in 0.19-, 0.57-, 0.95-m rows with maturity group IV soybean Asgrow 4922...
Growing conditions in the U.S. Midsouth allow for large soybean [ Glycine max L. (Merr.)] yields under irrigation, but there is limited information on planting dates (PD) and maturity group (MG) choices to aid cultivar selection. Analysis of variance across eight (2012) 10 (2013) locations, four PD, 16 cultivars (MG 3–6), revealed that genotype by environment (G×E) interaction accounted 38 22% total yield variability. Stability‐analysis techniques probability low were used investigate this...
Abstract Soil textural variability diminishes the effectiveness of conventional irrigation management. Variable rate (VRI) can address soil variability; however, users need guidance to prepare prescriptions for optimal water application. A study was conducted at Portageville, MO, USA, in 2016 and 2017 with objective compare yield use efficiency among three water-management treatments cotton: rainfed, irrigated based on USDA-ARS Irrigation Scheduling Supervisory Control And Data Acquisition...
Yield component analysis provides a framework for identifying potentially useful traits yield improvement. Consideration of how population density affects other components has not been addressed specifically short‐season soybean [ Glycine max (L.) Merr.] production. We assessed the direct and indirect contributions its over wide range densities (6–134 plants m −2 ) using path‐coefficient analysis. Data were from field tests conducted in 1997, 1998, 1999 at Keiser, AR. Although had large...
The uniformity of irrigation systems is important to efficiency, yield, and economics. Wind strongly affects this uniformity. A method presented for simulating the operation a sprinkler system in wind. Equations describing motion airborne water droplets are shown. trajectories ejected from were numerically computed. Composite results led predictions application patterns. Sprinkler droplet size distribution was used predict pattern around sprinkler, patterns superimposed represent set (not...
Many challenges currently facing agriculture require long-term data on landscape-scale hydrologic responses to weather, such as from the Goodwater Creek Experimental Watershed (GCEW), located in northeastern Missouri, USA. This watershed is prone surface runoff despite shallow slopes, a result of significant smectitic clay layer 30 50 cm deep that restricts downward flow water and gives rise periodic perched table. paper first series documents database developed GCEW. The objectives this are...
Planting date is one of the main factors affecting soybean (Glycine max [L.] Merr.) yield. Environmental conditions in US Midsouth allow for planting dates from late March through early July, and maturity groups (MGs) ranging 3 to 6. However, complexity interactions among date, MG, environment makes selection an optimum MG cultivar difficult. A regional 3‐yr study, conducted at eight locations with latitudes 30.6 38.9°N, MGs 6, was used examine relationship between relative yield day. The...
This study investigated rice irrigation water use in the University of Arkansas Rice Research Verification Program between years 2003 and 2012. Annual averaged 763 mm (30.0 in.) over 10 years. A significant (40%) savings was found for grown using a zero-grade system [486 (19.1 in.)] compared to contour-levee or straight-levee systems. No differences were systems [814 (32.1 [822 (32.4 in.)]. Surface irrigators used significantly less [624 (24.6 than groundwater well fields [786 (30.7 cost...
The midsouthern USA typically has a mid‐ to late‐summer drought that limits the productivity of nonirrigated maize ( Zea mays L.) production. We hypothesized by increasing seeded population and narrowing row spacing, short‐season hybrids in Midsouth would have similar yield but require less irrigation compared with currently grown. Irrigated experiments were conducted at Fayetteville, AR, 2001, 2002, 2003 Keiser, 2002 2003. Factors evaluated included maturity (75‐ 110‐d hybrids) (5 20 seed m...
Traditional flooded rice production utilizes a well or riser in the highest-elevation portion of field and waterspills into lower paddies as upper are filled. In an alternative method known multiple-inlet irrigation, ratherthan discharging directly highest paddy, pipe is connected gates holes water each paddy concurrently insteadof receiving overflow from higher paddy. The objective this research was to investigate whether multiple-inletapproach would result less being pumped for than...
Irrigated area in the Mid-South USA continues to increase and now totals four million ha. Because of low available water holding capacities shallow root-limiting layers many soils, irrigation management is difficult. Water quality use efficiency impacts under are poorly understood, but comprehension necessary if conversion from groundwater surface supplies be justified. As has increased, number university research extension personnel as well US Department Agriculture Agricultural Research...
Crop stand count and uniformity are important measures for making proper field management decisions to improve crop production. Conventional methods evaluating based on visual observation time consuming labor intensive, it difficult adequately cover a large field. The overall goal of this study was evaluate cotton emergence at two weeks after planting using unmanned aerial vehicle (UAV)-based high-resolution narrow-band spectral indices that were collected pushbroom hyperspectral imager...
ABSTRACT SET type (not continuously moving) sprinkler irri-gation systems are used extensively throughout the world. The uniformity of irrigation is important to efficiency, yield, and economics strongly affected by wind. effects wind investigated through computer simulation. Several combinations nozzle size, water pressure, spacing, direction were simulated over a range speeds. For conditions studied, triangular spacing patterns found be no better than rectangular, optimal orientation in...