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You searched for: Journal Agronomy journal Remove constraint Journal: Agronomy journal Publication Year 1993 Remove constraint Publication Year: 1993 Source 1993 v.85 no.3 Remove constraint Source: 1993 v.85 no.3 Text Availability Citation in PubAg Remove constraint Text Availability: Citation in PubAg
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1. Agronomic Practices that Affect Corn Kernel Characteristics

Author:
Ahmadi, M.; Wiebold, W. J.; Beuerlein, J. E.; Eckert, D. J.; Schoper, J.
Source:
Agronomy journal 1993 v.85 no.3 pp. 615-619
ISSN:
0002-1962
Subject:
Zea mays; plant density; crop yield; seeds; nitrogen content; hardness; seed quality; sowing date; grains; Ohio
Abstract:
... Agronomic practices affect corn (Zea mays L.) grain yield and may affect physical and chemical characteristics of corn kernels. These characteristics affect feed, food, and industrial uses of corn grain. Four field experiments consisting of planting date and population combinations were conducted to determine the effect of these agronomic practices on grain yield, kernel N concentration, and kerne ...
DOI:
10.2134/agronj1993.00021962008500030018x

2. An Inexpensive Thermocouple Multiplexing Device

Author:
Kvien, C. K.; Hook, J. E.; Thomson, S. J.; Smith, M. C.
Source:
Agronomy journal 1993 v.85 no.3 pp. 773-776
ISSN:
0002-1962
Subject:
research equipment; thermocouples; monitoring; microcomputers; data collection; computer techniques
Abstract:
... The expense of monitoring large numbers of thermocouples has constrained many research and development projects. We developed an inexpensive multiplexing device which allows 640 or more thermocouples to be accessed from a microcomputer. The multiplexing unit is connected to a microcomputer expansion box equipped with a 16-channel digital input/output (I/O) board and a preamp connected to an analog ...
DOI:
10.2134/agronj1993.00021962008500030045x

3. Application Placement and Timing of Nitrogen Solution for No-Till Corn

Author:
Stecker, J. A.; Buchholz, D. D.; Hanson, R. G.; Wollenhaupt, N. C.; McVay, K. A.
Source:
Agronomy journal 1993 v.85 no.3 pp. 645-650
ISSN:
0002-1962
Subject:
Zea mays; no-tillage; urea fertilizers; nutrient solutions; preplanting treatment; soil injection; crop yield; nutrient uptake; nitrogen; leaves; losses from soil; volatilization; application timing; application rate; grains; Missouri
Abstract:
... Fertilizing no-till corn (Zea mays L.) with urea-based N sources requires managing for N losses such as immobilization and NH₃ volatilization. In this study the interactive effects of fertilizer N application time and placement method were evaluated by applying urea ammonium nitrate (UAN) solution to no-till corn. Eight site-years of data were collected from sites in central, northeast, and northw ...
DOI:
10.2134/agronj1993.00021962008500030023x

4. A Sunflower Simulation Model: II. Simulating Production Risks in a Variable Sub-Tropical Environment

Author:
Meinke, Holger; Hammer, Graeme L.; Chapman, Scott C.
Source:
Agronomy journal 1993 v.85 no.3 pp. 735-742
ISSN:
0002-1962
Subject:
simulation models; Helianthus annuus; sowing date; tropics; subtropics; growth models; crop yield; seasonal variation; climatic factors; decision making; prediction; Queensland
Abstract:
... In highly variable environments, farmers require quantitative information on production risk to make well informed farming decisions. In many cases this can only be achieved through simulation studies. Thus, the dynamic sunflower (Helianthus annuus L) model QSUN was used, in conjunction with long-term climate records, to quantify the impact of climatic variability on production. Simulation results ...
DOI:
10.2134/agronj1993.00021962008500030039x

5. A Sunflower Simulation Model: I. Model Development

Author:
Chapman, Scott C.; Hammer, Graeme L.; Meinke, Holger
Source:
Agronomy journal 1993 v.85 no.3 pp. 725-735
ISSN:
0002-1962
Subject:
simulation models; Helianthus annuus; plant development; dry environmental conditions; phenology; dry matter accumulation; growth models; crop yield; decision making; prediction
Abstract:
... In dryland farming systems, opportunities to improve sunflower (Helianthus annuus L.) yields are mostly associated with management decisions made at planting. Dynamic crop simulation models can assist in making such decisions. This study reports the structure of QSUN, a simple and mechanistic crop model for sunflower, and how it accounts for the dynamic interaction of the crop with the soil and ae ...
DOI:
10.2134/agronj1993.00021962008500030038x

6. Bahiagrass Canopy Size, Soil Water, and Establishment of Aeschynomene

Author:
Kalmbacher, R. S.; Martin, F. G.; Hammond, L. C.; Boote, K. J.; Mislevy, P.
Source:
Agronomy journal 1993 v.85 no.3 pp. 535-540
ISSN:
0002-1962
Subject:
Aeschynomene americana; pasture plants; Paspalum notatum; sward; canopy; soil water potential; soil water content; seedlings; evapotranspiration; rain; Florida
Abstract:
... Aeschynomene americana L. is a tropical pasture legume, and in Florida, where it is usually grown with bahiagrass (Paspalum notatum Flügge), there are about 5000 ha. Limited soil water is a primary reason for stand failure of this annual. Soil water in three bahiagrass canopy sizes: small (2.2 leaf area index [LAI]), medium (4.5 LAI) and large (7.7 LAI) was measured at seeding and related to aesch ...
DOI:
10.2134/agronj1993.00021962008500030003x

7. Carbon and Phosphorus Losses from Decomposing Crop Residues in No-Till and Conventional Till Agroecosystems

Author:
Buchanan, Marc; King, Larry D.
Source:
Agronomy journal 1993 v.85 no.3 pp. 631-638
ISSN:
0002-1962
Subject:
crop residue management; no-tillage; carbon; phosphorus; roots; biogeochemical cycles; shoots; losses from soil; Triticum aestivum; degradation; leaves; mineralization; Zea mays; Glycine max; winter; Trifolium incarnatum; conventional tillage; crop residues; grains; lignin; nitrogen; cover crops; chemical constituents of plants; North Carolina
Abstract:
... An increased knowledge of crop residue decomposition characteristics is a critical component for nutrient cycling studies in agroecosystems. Carbon and P losses from shoot residues of maize (Zea mays L.), wheat [Triticum estivum (L.), emend. Thell], soybean [Glycine max (L.) Merr.], and shoot and root residues of crimson clover (Trifolium incarnatum L.) were compared in no-till and conventional ti ...
DOI:
10.2134/agronj1993.00021962008500030021x

8. Creeping Bentgrass Rooting as Influenced by Dithiopyr

Author:
Dernoeden, P. H.; Christians, N. E.; Krouse, J. M.; Roe, R. G.
Source:
Agronomy journal 1993 v.85 no.3 pp. 560-563
ISSN:
0002-1962
Subject:
Agrostis stolonifera var. palustris; lawns and turf; pyridine herbicides; weed control; chemical control; phytotoxicity; rooting; leaves; crop damage; roots; weight; chlorthal-dimethyl; bensulide; oxadiazon; application rate; application timing; discoloration; Iowa; Maryland
Abstract:
... Dithiopyr [3,5-pyridinedicarbothioic acid, 2-(difluoromethyl)-4(2-methylpropyl)-6-trifluoromethyl)S,S-dimethyl ester] is a new herbicide, but its foliar safety and potential rooting effects need to be documented before its use on creeping bentgrass (Agrostis palustris Huds.) can be recommended. Field studies were conducted at five separate sites in Iowa and in Maryland, where creeping bentgrass wa ...
DOI:
10.2134/agronj1993.00021962008500030008x

9. Crop Performance Trials under Irrigated and Dryland Conditions

Author:
Bowman, Daryl; Raymer, Paul; Dombeck, Don
Source:
Agronomy journal 1993 v.85 no.3 pp. 610-614
ISSN:
0002-1962
Subject:
Zea mays; Glycine max; irrigated conditions; dry environmental conditions; cultivars; hybrids; water stress; genotype-environment interaction; genetic variation; variety trials; crop yield; North Carolina; Georgia
Abstract:
... Corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] performance trials are sometimes conducted under both irrigated and dryland conditions in the southeastern USA. It is not known whether irrigated trials are better trials statistically or if irrigation causes relative rank changes in hybrid or cultivar performance. To answer these questions, corn data were examined from four different environ ...
DOI:
10.2134/agronj1993.00021962008500030017x

10. Development of Double-Crop Soybean under Different Soil Water Regimes

Author:
Pearce, R. C.; Grabau, L. J.; Grove, J. H.; Lin, H.
Source:
Agronomy journal 1993 v.85 no.3 pp. 576-583
ISSN:
0002-1962
Subject:
Glycine max; double cropping; Triticum aestivum; soil water content; crop yield; seeds; rain; dry environmental conditions; water stress; drought; sowing date; Kentucky
Abstract:
... Double-crop soybean [Glycine max (L.) Merr.] comprises nearly one-third of the total soybean hectarage in the southeasteirn USA. This study was initiated to investigate the water relations of soybean following winter wheat [Triticum aestivum (L.) emend. Thcll], with emphasis on the role of stored soil water. A treatment scheme was devised in which wheat was killed at heading, mid-grain fill, and m ...
DOI:
10.2134/agronj1993.00021962008500030011x

11. Evapotranspiration and Yield of Beans as Affected by Mulch and Irrigation

Author:
Barros, L. C. G.; Hanks, R. J.
Source:
Agronomy journal 1993 v.85 no.3 pp. 692-697
ISSN:
0002-1962
Subject:
Phaseolus vulgaris; mulching; wheat straw; irrigated conditions; sprinkler irrigation; crop yield; seeds; evapotranspiration; water use efficiency; transpiration; evaporation; application rate; Utah
Abstract:
... Mulch (crop residue) has been reported to increase soil water storage and crop yield, and to reduce soil water stress under some conditions. However, few studies have had irrigations, and thus evapotranspiration (ET), as a variable where soil water was controlled. Therefore, a study was conducted to evaluate the effect of mulch on ET, bean yield (Phaseolus vulgaris L.), and water use efficiency (W ...
DOI:
10.2134/agronj1993.00021962008500030032x

12. Forage Yield, Quality, Compatibility, and Persistence of Warm-Season Grass—Legume Mixtures

Author:
Posler, G. L.; Lenssen, A. W.; Fine, G. L.
Source:
Agronomy journal 1993 v.85 no.3 pp. 554-560
ISSN:
0002-1962
Subject:
Panicum virgatum; Lespedeza; Bouteloua curtipendula; crop quality; in vitro digestibility; Desmanthus illinoensis; nutritive value; Amorpha canescens; crop yield; Astragalus cicer; Dalea purpurea; Sorghastrum nutans; Kansas
Abstract:
... Development of compatible, persistent, warm-season grass-legume mixtures could increase forage yield and quality during summer months. We established a trial to determine forage yield, quality, species compatibility, and persistence of binary mixtures of warm-season grasses with selected legumes, five of which are native to the central USA. Grass entries were switchgrass (Panicum virgatum L.), sid ...
DOI:
10.2134/agronj1993.00021962008500030007x

13. Growth, Boll Opening Rate, and Fiber Properties of Narrow-Row Cotton

Author:
Heitholt, James J.; Pettigrew, William T.; Meredith, William R.
Source:
Agronomy journal 1993 v.85 no.3 pp. 590-594
ISSN:
0002-1962
Subject:
isogenic lines; lint cotton; seeds; Gossypium hirsutum; row spacing; early development; dry matter accumulation; crop yield; plant morphology; genotype; fiber quality; bolls; leaves; vegetative growth; Mississippi
Abstract:
... Row spacing has the potential to affect agronomic traits of upland cotton (Gossypium hirsutum L.). Although narrow-rows can pose numerous management challenges (e.g., cultivation and harvesting), the benefits of narrow-rows may justify their use. Unfortunately, the extent and consistency of cotton's response to narrow-rows is variable, which makes management decisions more difficult. The objective ...
DOI:
10.2134/agronj1993.00021962008500030013x

14. Inadequacy of the Liebig Limiting-Factor Paradigm for Explaining Varying Crop Yields

Author:
Sinclair, Thomas R.; Park, Wayne I.
Source:
Agronomy journal 1993 v.85 no.3 pp. 742-746
ISSN:
0002-1962
Subject:
crops; growth models; prediction; plant development; crop yield; equations; mathematical models
Abstract:
... Historically, the limiting-factor paradigm has been used to describe how crop yields may be constrained by the individual input resources required by plants. The limiting-factor paradigm proposes that plant growth is constrained only by a single resource whose availability is so low that it solely inhibits greater growth or growth rates. However, this paradigm ignores the great flexibility of plan ...
DOI:
10.2134/agronj1993.00021962008500030040x

15. Leaf Expansion in Field-Grown Sunflower in Response to Soil and Leaf Water Status

Author:
Sadras, V. O.; Villalobos, F. J.; Fereres, E.
Source:
Agronomy journal 1993 v.85 no.3 pp. 564-570
ISSN:
0002-1962
Subject:
Helianthus annuus; leaf area; leaves; leaf water potential; soil water content; dry environmental conditions; root systems; irrigated conditions; spring; summer; water stress; Spain
Abstract:
... Leaf responses to soil water deficits in controlled environaments may be mediated by nonhydraulic root signals (RS). The aim uf this study was to evaluate in the field the effects of RS and leaf water potential (Ψ¹) on leaf expansion rate (LER) of sunflower (Helianihus annuus L.). Two experiments were performed on a deep sandy-loam soil (Typic Xerofluvent) in a Mediterranean environment under spri ...
DOI:
10.2134/agronj1993.00021962008500030009x

16. Light Transmittance, Soil Temperature, and Soil Moisture under Residue of Hairy Vetch and Rye

Author:
Teasdale, J. R.; Mohler, C. L.
Source:
Agronomy journal 1993 v.85 no.3 pp. 673-680
ISSN:
0002-1962
Subject:
Secale cereale; Vicia villosa; cover crops; crop residues; biomass; weeds; seed germination; soil temperature; soil water content; cultural control; weed control; crop residue management; Maryland; New York
Abstract:
... Cover crop residue on the surface of soils in no-tillage systems can suppress weed emergence and growth. Although allelopathy often is invoked to explain weed suppression by residue, physical alterations of the seed environment could be important as well. This experiment was conducted to determine the light, temperature, and moisture conditions under cover crop residue. Hairy vetch (Vicia villosa ...
DOI:
10.2134/agronj1993.00021962008500030029x

17. Logistic Response of Bermudagrass and Bunchgrass Cultivars to Applied Nitrogen

Author:
Overman, A. R.; Sanderson, M. A.; Jones, R. M.
Source:
Agronomy journal 1993 v.85 no.3 pp. 541-545
ISSN:
0002-1962
Subject:
interspecific variation; cultivars; mathematical models; forage crops; Panicum coloratum; application rate; soil water content; Cynodon dactylon; arid zones; dry matter accumulation; crop yield; rain; growth models; Eragrostis curvula; Cenchrus ciliaris; nitrogen fertilizers; Texas
Abstract:
... Models provide a quantitative means to evaluate yield response of forage grasses to applied N and water availability. The objective of this analysis was to estimate model parameters (A, b, c) for bermu. dagrasses and bunchgrasses grown at the same location and during the same time period. The logistic equation was used to relate annual dry matter production to applied N for three bermudagrasses [C ...
DOI:
10.2134/agronj1993.00021962008500030004x

18. Management and Environment Effects on Dry Matter Yields of Three Brassica Species

Author:
Wiedenhoeft, M. Hagemann
Source:
Agronomy journal 1993 v.85 no.3 pp. 549-553
ISSN:
0002-1962
Subject:
harvest date; interspecific variation; Brassica rapa subsp. pekinensis; hybrids; sowing date; soil water content; grazing; air temperature; dry matter accumulation; regrowth; forage; crop yield; Brassica napus; Brassica rapa subsp. oleifera; cold; Maine
Abstract:
... Brassica crops have potential use as a forage during summer, fall, and early winter months. The influence of planting date and harvest date on the initial and regrowth herbage yields for three Brassica species: rape (B. napus L., ‘Winfred’ in 1987 and ‘Emerald’ in 1988 and 1989), turnip (B. rapa L., ‘Purple Top’), and a turnip hybrid (B. rapa × B. pekinensis L., ‘Tyfon’) were investigated. The spe ...
DOI:
10.2134/agronj1993.00021962008500030006x

19. Modeling Pepper Seedling Growth and Nutrient Uptake as a Function of Cultural Conditions

Author:
Bar-Tal, A.; Bar-Yosef, B.; Kafkafi, U.
Source:
Agronomy journal 1993 v.85 no.3 pp. 718-724
ISSN:
0002-1962
Subject:
simulation models; seedling growth; Capsicum annuum; nitrogen; seedlings; irrigation; fertilizers; equations; nutrient uptake; plant density; growth models; growing media; nutrient solutions; seedling production; phosphorus; water uptake
Abstract:
... A mechanistic model was developed to describe pepper seedling growth, and water, N, and P uptake as a function of N and P concentrations in the irrigation solution, growth medium volume per plant, planting density, and growth substrate characteristics. Such a model will help optimize irrigation and fertilization of transplants and elucidate some of the mechanisms involved in seedling production. T ...
DOI:
10.2134/agronj1993.00021962008500030037x

20. Model of Integrated Effects of Boron, Inert Salt, and Water Flow on Crop Yield

Author:
Shani, U.; Hanks, R. J.
Source:
Agronomy journal 1993 v.85 no.3 pp. 713-717
ISSN:
0002-1962
Subject:
Zea mays; simulation models; Hordeum vulgare; phytotoxicity; equations; boron; leaching; soil salinity; growth models; water flow; soil water; crop yield; soil salts; Utah
Abstract:
... High boron concentration in the soil causes yield reduction. Recently, a piecewise linear response curve was applied to describe yield response to B in near steady-state conditions. However, application of similar curves to field situations where water, B, and other ion contents are transient and nonhomogeneous is limited. The objective of this study was to develop a model for simulation of the in ...
DOI:
10.2134/agronj1993.00021962008500030036x