Agronomy Journal
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Simulating Effects of Genes for Physiological Traits in a Process‐Oriented Crop Model
Agronomy Journal - Tập 88 Số 3 - Trang 416-422 - 1996
AbstractRecent improvements in crop simulation techniques and in understanding
of crop genetics suggest the possibility of integrating genetic information on
physiological traits into crop simulation models. By using known genotypes,
rather than empirically fitted cultivar‐specific coefficients, a simulation
model should permit more explicit testing of hypotheses concerning the genetic
basis of ad...
Path Analysis of Heavy Metal Adsorption by Soil
Agronomy Journal - Tập 85 Số 5 - Trang 1054-1057 - 1993
AbstractPath analysis, a statistical technique that differentiates between
correlation and causation, was used to describe heavy metal adsorption by soil.
A path analysis model that evaluates the effect of soil pH, CEC, organic carbon
content (OC), and clay content on adsorption of Cd, Cu, Ni, Pb, and Zn by soils
from two long‐term cropping experiments in Sutherland and Kanawha, IA, was
investigat...
In Situ Nuclear Magnetic Resonance Imaging of Roots: Influence of Soil Type, Ferromagnetic Particle Content, and Soil Water1
Agronomy Journal - Tập 79 Số 6 - Trang 957-965 - 1987
AbstractThe paucity of root information combined with the difficulty in
obtaining it make new approaches imperative. The observation of roots is
essential to the understanding of plant growth and productivity. Proton (1H)
nuclear magnetic resonance (NMR) imaging offers a noninvasive method for the
study of both root morphology and function in situ. Herein, NMR imaging of plant
root systems was eva...
Source–Sink Capacity Responsible for Higher Maize Yield with Removal of Plastic Film
Agronomy Journal - Tập 105 Số 3 - Trang 591-598 - 2013
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 performed a field experiment to
invest...
Legume and Mineral N Effects on Crop Yields in Several Crop Sequences in the Upper Mississippi Valley1
Agronomy Journal - Tập 73 Số 5 - Trang 885-890 - 1981
AbstractThe total effect of legumes on subsequent crop yields may be divided
into two categories: (i) the effect of the N that they supply, and (ii) the net
effect of all other contributions. Knowing the size of these two effects, plus
the N response of the subsequent crops, allows N fertilization to be optimized
for decreased energy use and for reduced pollution potential. Because the size
of the...
Microbial Biomass Turnover in Indian Subtropical Soils under Different Sugarcane Intercropping Systems
Agronomy Journal - Tập 98 Số 3 - Trang 698-704 - 2006
Changes in soil organic C (Corg), total N (Nt), available nutrients, soil
microbial biomass C (Cmic) and N (Nmic), and mineralizable C and N in the
sugarcane (Saccharum officinarum L.) rhizosphere were evaluated under intensive
sugarcane cropping systems with intercrops including wheat (Triticum aestivum
L.), maize (Zea mays L.), rajmash (Phaseolus vulgaris L.), green gram [Vigna
radiata (L.) R. W...
Rotation and Nitrogen Fertilization Effects on Changes in Soil Carbon and Nitrogen
Agronomy Journal - Tập 86 Số 2 - Trang 319-325 - 1994
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 improvement and global climate changes. My
objective was ...
Cover Crop Mixtures Do Not Use Water Differently than Single‐Species Plantings
Agronomy Journal - Tập 107 Số 3 - Trang 1025-1038 - 2015
Recent recommendations advocating the use of cover crop mixtures instead of
single‐species in semi‐arid environments require rigorous scientific studies.
One of those stated benefits is greatly reduced water use by cover crops grown
in mixtures. The objectives of this study were to characterize soil water
extraction patterns and determine water use of cover crops grown in
single‐species plantings ...
Choice of Summer Fallow Replacement Crops Impacts Subsequent Winter Wheat
Agronomy Journal - Tập 99 Số 2 - Trang 578-584 - 2007
Winter wheat (Triticum aestivum L.) is the foundation of dryland cropping
systems in the Central Great Plains. The objective of this study was to quantify
the effects of four short‐season spring‐planted crops used to replace summer
fallow on the subsequent winter wheat crop. Wheat was seeded into four crop
stubbles [spring triticale (×Triticosecale Wittmack), dry pea (Pisum sativum
L.), foxtail mi...
Legume Green Fallow Effect on Soil Water Content at Wheat Planting and Wheat Yield
Agronomy Journal - Tập 97 Số 3 - Trang 684-689 - 2005
Growing a legume cover crop in place of fallow in a winter wheat (Triticum
aestivum L.)–fallow system can provide protection against erosion while adding N
to the soil. However, water use by legumes may reduce subsequent wheat yield.
This study was conducted to quantify the effect of varying legume termination
dates on available soil water content at wheat planting and subsequent wheat
yield in th...
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