PubAg

Main content area

You searched for: Publication Year 1993 Remove constraint Publication Year: 1993 Source 1993 v.85 no.3 Remove constraint Source: 1993 v.85 no.3 Subject crop yield Remove constraint Subject: crop yield Subject dry matter accumulation Remove constraint Subject: dry matter accumulation
Start Over

Search

7  Search Results

1 - 7 of 7
Number of results to display per page

Search Results

1. 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

2. 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

3. 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

4. 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

5. Plant Yields and Fodder Quality Related Characteristics of Millet-Stylo Intercropping Systems in the Sahel

Author:
Kouamé, C. N.; Powell, J. M.; Renard, C. A.; Quesenberry, K. H.
Source:
Agronomy journal 1993 v.85 no.3 pp. 601-605
ISSN:
0002-1962
Subject:
crop quality; nutritive value; Pennisetum glaucum; dry matter accumulation; Stylosanthes hamata; crop yield; crude protein; grains; Sahel; intercropping; Niger
Abstract:
... The integration of forage legumes into the low-input, cereal-based farming system of the Sahel may be the key to sustaining soil, crop, and livestock production. The objectives of this study were to evaluate the effects of intercropping the forage legumes Stylosanthes fruticosa (Retz.) Alston or S. hamata (L.) Taub. with millet [Pennisetum glaucum (L.) R. Br.J on grain yield, fodder yield, and cru ...
DOI:
10.2134/agronj1993.00021962008500030015x

6. Response of Cotton to Varying COz, Irrigation, and Nitrogen: Yield and Growth

Author:
Kimball, B. A.; Mauney, J. R.
Source:
Agronomy journal 1993 v.85 no.3 pp. 706
ISSN:
0002-1962
Subject:
Gossypium hirsutum; dry environmental conditions; nitrogen fertilizers; crop yield; harvest index; lint cotton; seeds; dry matter accumulation; water stress; irrigated conditions; source-sink relationships; photosynthesis; carbon dioxide; root shoot ratio; Arizona
Abstract:
... The CO concentration of the atmosphere is increasing and is expected to double sometime near the middle of the next century. To determine the effects of such a CO increase on cotton (L.) growth and productivity, a series of experiments from 1983 through 1987 were conducted with open-top CO-enriched field chambers at ample as well as limiting levels of water and N at Phoenix, AZ. Comparisons with o ...
Handle:
10113/50192
DOI:
10.2134/agronj1993.00021962008500030035x

7. Yield Responses of Alfalfa to Simulated Alfalfa Weevil Injury and Development of Economic Injury Levels

Author:
Peterson, Robert K. D.; Danielson, Stephen D.; Higley, Leon G.
Source:
Agronomy journal 1993 v.85 no.3 pp. 595-601
ISSN:
0002-1962
Subject:
Medicago sativa; Hypera postica; crop damage; defoliation; regrowth; dry matter accumulation; crop yield; leaves; stems; economic threshold; Nebraska
Abstract:
... Although the alfalfa weevil Hypera postica (Gyilenhal)] is an important alfalfa (Medicago sativa L.) pest, relatively little is known about how defoliation at specific plant developmental stages affects yield. This study was conducted to characterize yield responses of alfalfa to simulated alfalfa weevil injury when injury was initiated at the early bud stage of the first growth cycle and to devel ...
DOI:
10.2134/agronj1993.00021962008500030014x