Agronomy Journal

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Source–Sink Capacity Responsible for Higher Maize Yield with Removal of Plastic Film
Agronomy Journal - Tập 105 Số 3 - Trang 591-598 - 2013
Lingduo Bu, Lin Zhu, Jianliang Liu, Shasha Luo, Xin‐ping Chen, Shiqing Li
Techniques based on the use of double ridges and furrows mulched with plastic film is very effective for improving water use efficiency and maize (Zea mays L.) yields in semiarid areas. Little is known, however, about the impact of removing the plastic film mulch during the reproductive stage (RS), i.e., during the July to September rainy season. We therefore per...... hiện toàn bộ
Rotation and Nitrogen Fertilization Effects on Changes in Soil Carbon and Nitrogen
Agronomy Journal - Tập 86 Số 2 - Trang 319-325 - 1994
Gary E. Varvel
AbstractLong‐term effects of cropping systems on soil properties, such as organic soil C and N levels, is necessary so more accurate projections can be made regarding the sequester and emission of CO2 by agricultural soils. This information can then be used to predict the effects of cropping systems on both soil degradation, maintenance, or imp...... hiện toàn bộ
Analysis of Seedbeds and Maturity Groups for Dryland Soybean on Clayey Soil
Agronomy Journal - Tập 93 Số 4 - Trang 827-835 - 2001
Michael P. Popp, T. C. Keisling, Lawrence R. Oliver, Carl R. Dillon, Patrick Manning
Soybean [Glycine max (L.) Merr.] production systems on clayey soils are difficult to manage. With improvements in no‐till planting equipment and herbicide technologies in the early 1990s, no‐till production has become a viable alternative to the traditional tilled seedbed. Therefore, the relative economic performance of tilled and no‐till seedbeds with respect to...... hiện toàn bộ
Stability Analysis Using the SAS System
Agronomy Journal - Tập 91 Số 1 - Trang 154-160 - 1999
Hans‐Peter Piepho
AbstractMultienvironment trials are often analyzed to assess the yield stability of genotypes. Most of the common stability measures correspond to parameters of a mixed model with fixed genotypes and random environments. Analysis within a mixed model framework allows unbalanced data to be handled. This note shows how to fit the most common stability models using th...... hiện toàn bộ
Evapotranspiration Rates of Field Crops Determined by the Bowen Ratio Method1
Agronomy Journal - Tập 58 Số 3 - Trang 339-342 - 1966
Leo J. Fritschen
AbstractSimultaneous evapotranspiration rates were determined biweekly for the crop combinations of alfalfa and barley, alfalfa and cotton, alfalfa and sorghum, wheat and oats, and cotton from meteorological data by the Bowen ratio method. The crops were grown under irrigated conditions in the hot, arid region of south‐central Arizona. Calculated evapotranspiration...... hiện toàn bộ
Seedling Emergence Model for Velvetleaf
Agronomy Journal - Tập 85 Số 4 - Trang 929-933 - 1993
Frank Forcella
AbstractConsistent postemergence weed control requires information on the timing of weed emergence. Information is especially important for velvetleaf (Abutilon theophrasti Medikus), which interferes with many crops over a broad geographic range. The objective of this study was to develop a model that predicts the timing and proportional ...... hiện toàn bộ
Radiation Use Efficiency of an Old and a New Maize Hybrid
Agronomy Journal - Tập 84 Số 3 - Trang 536-541 - 1992
M. Tollenaar, A. Aguilera
AbstractDifferences in dry matter accumulation among crop cultivars can be attributed to differences in either the absorptance of incident photosynthetically active radiation (PAR) and/or the conversion of absorbed PAR into dry matter. This study was conducted to quantify the contribution of radiation use efficiency (RUE, g dry matter MJ−1) to ...... hiện toàn bộ
Modeling Water‐Stressed Cotton Growth Using Within‐Season Remote Sensing Data
Agronomy Journal - Tập 98 Số 6 - Trang 1600-1609 - 2006
Jonghan Ko, Stephan J. Maas, Steve Mauget, Giovanni Piccinni, D. F. Wanjura
Remotely sensed crop reflectance data can be used to simulate crop growth using within‐season calibration. A model based on GRAMI, previously modified to simulate cotton (Gossypium hirsutum L.) growth, was revised and tested to simulate leaf area development and to estimate lint yield of water‐stressed cotton. To verify the model, cotton field data, such as leaf ...... hiện toàn bộ
Operational Estimates of Reference Evapotranspiration
Agronomy Journal - Tập 81 Số 4 - Trang 650-662 - 1989
Richard G. Allen, Marvin E. Jensen, James L. Wright, Robert D. Burman
AbstractMany forms of the Penman combination equation have been proffered for estimating daily evapotranspiration (ET) by the agricultural reference crops grass and alfalfa (Medicago sativa L.). This study was conducted to evaluate popular forms of the Penman equation, and to develop and evaluate general relationships for estimating daily...... hiện toàn bộ
Dryland Performance of Sweet Sorghum and Grain Crops for Biofuel in Nebraska
Agronomy Journal - Tập 102 Số 1 - Trang 319-326 - 2010
Charles S. Wortmann, Adam Liska, Richard B. Ferguson, Drew J. Lyon, Robert N. Klein, Ismail Dweikat
Sweet sorghum [SS; Sorghum bicolor (L.) Moench] is a potential biofuel crop for the Great Plains. Sweet sorghum was compared with corn [Zea mays (L.)] and grain sorghum for potential ethanol yield, energy use efficiency, and greenhouse gas (GHG) emissions at seven dryland site‐years in Nebraska. Seasonal rainfall ranged from approximate...... hiện toàn bộ
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