Title: Wheat yield and tillage–straw management system×year interaction explained by climatic co-variables for an irrigated bed planting system in northwestern Mexico
Authors: Verhulst, Nele ×
Sayre Ken D.
Vargas, Mateo
Crossa Jose
Deckers, Seppe
Raes, Dirk
Govaerts, Bram #
Issue Date: Dec-2011
Publisher: Elsevier Scientific Pub. Co.
Series Title: Field Crops Research vol:124 issue:3 pages:347-356
Abstract: Wheat is an important food and income source and estimated demand for wheat in the developing world
is projected to increase substantially. The objectives of this study were to gain insight into (i) the effect
of tillage–straw system on yield and yield components (number of grains per m2 and thousand kernel
weight), (ii) the relation between climatic conditions and yield and yield components, (iii) the explanation
of tillage–straw system×year interaction for yield and yield components by climatic co-variables. Wheat
grain yield and yield components were measured in a long-term trial established in 1992 under irrigated,
arid conditions in northwestern Mexico. Five tillage–straw management systems (conventionally tilled
raised beds [CTB] with straw incorporated and permanent raised beds [PB] with straw burned, removed,
partly retained or fully retained) were compared for a wheat–maize rotation. Daily climatic data were
averaged over six periods corresponding approximately to advancing wheat growth stages. The PB-straw
retained and PB-straw removed had the highest yields (average yield of 7.31 and 7.24 t ha−1, respectively)
and grains perm2. The PB-straw burned had the lowest yield (average yield of 6.65 t ha−1) and grains per
m2, but the highest thousand kernel weight. Maximum temperature was positively correlated to final
grain yield during tillering and head differentiation, but was negatively correlated to thousand kernel
weight during grain-filling. For the tillage–straw system year interaction, three groups of management
systems were distinguished for yield and grains perm2: PB-straw burned, CTB-straw incorporated and PB
where straw is not burned. The CTB-straw incorporated had a positive interaction with year in favorable
years with high radiation and evapotranspiration. The PB-straw burned was relatively more affected
by excess water conditions and showed positive interactions in years with high relative humidity. The
PB-straw retained was the most stable in different climatic conditions, indicating that this management
system could contribute to maintaining wheat yield in a changing climate scenario.
ISSN: 0378-4290
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division Soil and Water Management
× corresponding author
# (joint) last author

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