U.S. flag

An official website of the United States government

PubAg

Main content area

You searched for: Journal Agronomy journal Remove constraint Journal: Agronomy journal Source 1993 v.85 no.3 Remove constraint Source: 1993 v.85 no.3 Subject Helianthus annuus Remove constraint Subject: Helianthus annuus
Start Over

Search

3  Search Results

1 - 3 of 3
Number of results to display per page

Search Results

1. 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

2. 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

3. 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