New Zealand Journal of Crop and Horticultural Science abstracts
Drought influences on grain yield of barley, wheat, and maize
P. D. JAMIESON
R. J. MARTIN
G. S. FRANCIS
New Zealand Institute for Crop and Food
Research Limited
Private Bag 4704
Christchurch, New Zealand
Abstract The response of three grain crops to drought was
determined in a series of experiments in a mobile rainshelter at Lincoln,
Canterbury, New Zealand. For winter wheat and spring barley, the critical
potential soil moisture deficit (Dc) beyond which yield was affected was
independent of drought timing, but was much smaller for barley than wheat. Both
crops showed similar yield responses to drought above their Dc. In contrast, Dc
for maize increased as the season progressed, and yield was much less sensitive
to drought once Dc was exceeded. Although yield response was mostly associated
with grain number in wheat and barley, mean kernel mass was also reduced as
drought stress increased. Grain yield in maize was correlated with mean kernel
mass, and uncorrelated with grain number.
Keywords drought response; grain mass; grain number
New Zealand Journal of Crop and Horticultural Science, 1995, Vol. 23:
55-66
0114-0671/95/2301-0055 $2.50/0 (c) The Royal Society of New Zealand
1995
PDF file of entire paper: medium quality (842K); (scanned from paper original: notes about this process)
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