William Hargrove | University of Texas at El Paso (UTEP) (original) (raw)

Papers by William Hargrove

American journal of alternative agriculture, Jun 1, 1999

Tillage and cropping sequence studies were conducted on a Hartsells fine sandy loam from 1981 to ... more Tillage and cropping sequence studies were conducted on a Hartsells fine sandy loam from 1981 to 1984 to determine the influence of tillage systems and crop rotation on soybean relative yields. The tillage systems were conven- tional, strip-tillage, and no- tillage. Crop rotation was continuous soybeans, corn-soybeans (full season), corn-wheat-soybeans (double-cropped soybeans). In 1982 through 1984, conventional tillage with continuous soybeans resulted in lower soybean yields than strip- tillage or no- tillage. Corn-soybean rotation consistently resulted in higher soybean yields than continuous soybeans. Double-cropped soybean yields were reduced by 10%when compared to full season soybeans, but wheat yields associated with double-cropped soybeans ranged from 3000 to 3900 kg/ha. The buildup of soybean cyst nematodes (continuous soybean with conventional tillage) appears to have a greater effect on soybean yields than soil compaction, soil nutrient levels, or rainfall distribution.

The NRI Water Program provided partial support for a national conference on the topic of sediment... more The NRI Water Program provided partial support for a national conference on the topic of sedimentation of reservoirs. The conference is to be held in Kansas City, Sept 14-16, 2009. Part of the conference will be a brainstorming session on future research and information needs to address this critical issue which is a threat to public water supplies. This presentation will summarize the conference and the results of the brainstorming session.

Journal of Soil and Water Conservation, 2020

The soft path to water: A conservation-based approach to improved water access and sanitation for... more The soft path to water: A conservation-based approach to improved water access and sanitation for rural communities THE CHALLENGE OF WATER ACCESS IN SMALL ISOLATED RURAL COMMUNITIES The traditional approach to providing water in an urban or suburban context is a hard-engineered centralized system of water treatment and distribution from the point of treatment. For sanitation, the conventional system includes collection and delivery of waste to a centralized treatment system before discharge to a water body. Hard-engineered systems place most of their emphasis on managing/increasing water supply with much less attention to managing water demand. There are many small rural communities, particularly in the southwestern United States, but also in other regions of the United States, that are remote, isolated, and with relatively small populations who lack access to adequate water and sanitation. For these communities, hard-engineered systems are neither a reality today nor are likely to be in the near term. Many of these communities resemble rural areas in developing countries and share several of the following characteristics (

Journal of Economic Entomology, 1994

Page 1. Row CROPS, FORAGE, AND SMALL GRAINS Cover Crop and Nitrogen Fertility Effects on Southern... more Page 1. Row CROPS, FORAGE, AND SMALL GRAINS Cover Crop and Nitrogen Fertility Effects on Southern Com Rootworm (Coleoptera: Chrysomelidae) Damage in Com G. DAVID BUNTIN, JOHN N. ALL,l DANIEL V. McCRACKEN,2 AND WILLIAM L. HARGROVE2 ...

Watershed Management to Meet Water Quality Standards and Emerging TMDL, 5-9 March 2005, Atlanta, Georgia

Total Maximum Daily Load (TMDL) Environmental Regulations II

Soil Science Society of America Journal, 1986

The N contained in winter cover crops (particularly legumes) is a potentially important source of... more The N contained in winter cover crops (particularly legumes) is a potentially important source of N for succeeding crops. The purpose of this study was to determine N release from crimson clover (Trifolium incarnatum L.) residue under no‐tillage and conventional tillage conditions. Residues contained in nylon mesh (53 µm) bags placed either on the surface of no‐tillage plots or buried at plowlayer depth in conventional tillage plots were removed for dry matter, C, and N determinations at 1, 2, 4, 8, and 16 weeks after placement in mid‐May. The rate of N disappearance was more rapid under conventional than no‐tillage conditions. The percentage of initial residue N remaining at 4 and 16 weeks under conventional tillage conditions was 40 and 31, respectively. The corresponding values for no‐tillage were 63 and 36% at 4 and 16 weeks. The C/N ratio of the residue remained relatively unchanged over the 16‐week period under no‐tillage conditions. However, under conventional tillage conditi...

Soil and Tillage Research, 1989

American Journal of Alternative Agriculture, 1999

Plant and Soil, 1985

... Wheat Arthur 71 2.07a 1.35b 1.26b Coker 762 2.05a 1.53b 1.25b Stacy 1.62a 1.22b 1.1 lb ... So... more ... Wheat Arthur 71 2.07a 1.35b 1.26b Coker 762 2.05a 1.53b 1.25b Stacy 1.62a 1.22b 1.1 lb ... Soc. Am., Madison, Wisconsin. pp 249-270. 8 Karlen DL 1982 Nutrient concentration and field variation within southern soybean germplasm grown on acid Norfolk soil. Commun. Soil Sci. ...

Agronomy Journal, 1988

Intensive management practices, such as high fertility, fungicides, and plant growth regulators, ... more Intensive management practices, such as high fertility, fungicides, and plant growth regulators, have substantially increased grain yield of soft red winter wheat (Triticum aestivum L.) in the northeastern and mid‐Atlantic USA. Our objective was to determine the effects of row spacing and seeding rate on grain yield and yield components of several cultivars in a high‐yield environment in the southeastern USA. Five cultivars, Coker 916, Coker 983, Hunter, Florida 301, and Florida 302, were grown during 1985 and 1986 on a Greenville sandy clay loam (clayey, kaolinitic, thermic Rhodic Paleudult) in row spacings of 0.10 and 0.20 m at seeding rates of 288 and 576 seeds m−2. Management practices included a high rate of fertilizer‐N (176 kg ha−1) in multiple applications, fungicide and plant growth regulator applications, irrigation, and adequate levels of P, K, S, and Mg. Grain yields ranged from 3.9 to 6.3 Mg ha−1 and averaged 5.0 Mg ha−1. Narrow row spacing (0.10 m) yielded 0.4 Mg ha−1 ...

Agronomy Journal, 1982

Nitrogen fertilizer is an expensive but essential input for optimum production of non‐leguminous ... more Nitrogen fertilizer is an expensive but essential input for optimum production of non‐leguminous crops. The use of N fertilizer for summer grain crops can be reduced and possibly eliminated by double cropping with leguminous winter crops. Costs of seeding winter legumes, however, are often as expensive as the commercially produced N that they replace. Allowing the legumes to produce seed prior to planting the summer crop may potentially eliminate costs associated with seeding the legume each fall. The purpose of this field study, conducted on a Cecil sandy loam soil (Typic Hapludult), was to determine N fertilizer requirements for no‐tillage grain sorghum (Sorghum bicolor L. Moench) double cropped with reseeding crimson clover (Trifolium incarnation L.) and effects of N treatments on nutrient uptake and on insect populations. Nitrogen treatments were 0, 15, 30, 45, 90, and 135 kg N/ha and the clover tissue was either removed or left on the soil surface as a no‐tillage mulch.No‐till ...

Agronomy Journal, 1983

Few studies have addressed factors which affect wheat (Triticum aestivum L.) production in double... more Few studies have addressed factors which affect wheat (Triticum aestivum L.) production in double‐cropping systems. This study was conducted for 4 years at two locations in Georgia (Limestone Valley and Coastal Plain regions) to determine the influence of the previous crop on fertilizer N requirements for double‐cropped wheat. The N fertilizer treatments were fall (0, 11, 22, 33, and 44 kg N ha−1 as ammonium nitrate) and spring (0, 22, 44, 66, and 88 kg N ha−1 as ammonium nitrate) N rates applied to wheat following soybeans (Glycine mar L. Merr.) or grain sorghum [Sorghum bicolor (L.) Moench]. The soil types were Cedarbluff silt loam (fine‐loamy, siliceous, thermic Fragiaquic Paleudult) in the Limestone Valley region and Greenville sandy clay loam (clayey, kaolinitic, thermic Rhodic Paleudult) in the Coastal Plain region. Plant samples were obtained each year at the time of the spring N application, and the N content of plant tissue was determined. In addition, whole plant and flag ...

Agriculture, Ecosystems & Environment, 1991

Characterization of a substrateinduced respiration method for measuring fungal, bacterial and tot... more Characterization of a substrateinduced respiration method for measuring fungal, bacterial and total microbial biomass on plant residues. Agric. Ecosystems Environ., 34: 65-73. A substrate-induced respiration (SIR) method is described to measure the contributions of fungi and bacteria to total glucose-induced microbial respiration on plant residues of differing composition. Relationships between fungal, bacterial and total SIR and biomass were used to develop regression equations for predicting microbial biomass C from measures of SIR. Total SIR rates (100-2000/zg CO2-C g-l h-l) and biomass-specific SIR rates (64-72 ng CO2-C h-1/zg-~ biomass C) from plant residues were considerably greater than those calculated from the literature for soils. Results of longer term decomposition studies indicate that the C:N ratios of plant residues through time account for the greatest amount of the variation in total SIR. Annual decomposition rate constants (k) for plant residues were positively correlated (r2= 0.99) to overall mean estimates of total SIR. The plant residue SIR method has advantages over conventional direct count methods because it distinguishes a physiologically active component of the microbial biomass. Furthermore, it allows separation of fungal and bacterial components that may aid in understanding microbial controls on plant residue decomposition.

Opportunities, use, and transfer of systems research methods in agriculture to developing countries, 1994

The mission of the USAID-funded Sustainable Agriculture and Natural Resource Management Collabora... more The mission of the USAID-funded Sustainable Agriculture and Natural Resource Management Collaborative Research Support Program (SANREM CRSP) is to implement a comprehensive, farmer-participatory, interdisciplinary research, training, and information exchange program that will elucidate and establish the principles of sustainable agriculture and NRM on a landscape scale.

The key to achieving the most cost effective water-quality protection on a watershed scale is to ... more The key to achieving the most cost effective water-quality protection on a watershed scale is to identify and implement practices on areas that contribute most to water-quality impairment. This stands in contrast to the typical approach, where implementation depends on volunteer adoption by landowners and managers. The goal of this paper is to present a strategic approach that identifies areas that have the greatest potential to contribute to water-quality improvement and helps focus the watershed management efforts that will produce maximum water-quality benefits on these areas. The study watershed, Smoky Hill River/Kanopolis Lake watershed in Kansas, USA, consists of almost 50% cropland, considered a major source of pollutants. The impacts of reduced tillage (RT) and edge-of-field vegetative buffers (VBS) on sediment and nutrients were evaluated using either random implementation or strategic targeting based on ranked subbasin overland sediment yield. The targeted watershed modell...