New Zealand Journal of Crop and Horticultural Science abstracts
Effect of timing and intensity of drought on the growth and yield
of field peas (Pisum sativum L.)
R. J. MARTIN
P. D. JAMIESON
New Zealand Institute for Crop & Food
Research Limited
Private Bag 4704
Christchurch, New Zealand
Abstract The response of field peas (Pisum sativum L.)
to timing and intensity of drought was determined in an experiment in a mobile
rainshelter, which excluded rainfall during growth of the crop. Twelve
irrigation treatments subjected the crops to drought of varying duration at
different stages during plant growth. Before and after the drought, the crops
were fully irrigated. Pea seed yield decreased linearly as the maximum
potential soil moisture deficit (Dpmax) experienced during the growth of the
crop increased from 49 to 323 mm. The timing of Dpmax did not affect the
decline in pea seed yield, but did affect the total dry matter (DM) produced by
the crop. If Dpmax occurred before flowering, radiation interception and total
DM yield were reduced more than if Dpmax occurred after flowering. However,
this total yield reduction was completely offset by an increase in individual
pea weight and consequently an increased harvest index. Pea seed yield was
closely related to pod number per unit area, which was also strongly related to
water stress. The number of peas per pod was unaffected by water stress.
Keywords Pisum sativum L.; peas; irrigation; yield;
leaf area
New Zealand Journal of Crop and Horticultural Science, 1996, Vol. 24:
167-174
0114-0671/96/2402-0167 $2.50/0 (c) The Royal Society of New Zealand
1996
PDF file of entire paper: medium quality (609K); (scanned from paper original: notes about this process)
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