New Zealand Journal of Crop and Horticultural Science abstracts
Effect of early blight (Alternaria solani) and different nitrogen
inputs on radiation interception, radiation use efficiency, and total dry
matter production in potatoes (Solanum tuberosum) grown in Canterbury,
New Zealand
S. F. A. Shah*
B. A. McKenzie
R. E. Gaunt†
Soil, Plant and Ecological Sciences Division
Lincoln University
Canterbury, New Zealand
John W. Marshall
New Zealand Institute for Crop and Food
Research Limited
Private Bag 4704
Christchurch, New Zealand
C. M. Frampton
Christchurch School of Medicine
University of Otago
P.O. Box 4345
Christchurch, New Zealand
*Present address: New Zealand Institute for Crop and Food Research Limited,
Private Bag 4704, Christchurch, New Zealand. email: Shahf@crop.cri.nz
†Deceased.
Abstract Field experiments were conducted in 1995/96
and 1996/97 to investigate the effect of early blight epidemics on photosynthetically
active radiation (PAR) interception (RI), radiation use efficiency (RUE),
and total dry matter (TDM) production of potatoes (Solanum tuberosum)
grown in Canterbury, New Zealand. RI was calculated from green leaf area
index (GLAI) corrected for disease. RUE was calculated as the ratio between
accumulated TDM and accumulated RI. Early blight reduced RI by 9% in both
seasons and RUE by 17% and 28% in 1995/96 and 1996/97 respectively. There
was a total loss of 26% and 36% in TDM in 1995/96 and 1996/97 respectively.
Nitrogen inputs increased RUE by 3% and 16% as compared to low nitrogen status
in 1995/96 and 1996/97 respectively. Results showed that RI and RUE, calculated
from leaf area index (LAI), not corrected for disease, underestimated the
loss in RI and RUE.
Keywords early blight; Alternaria solani; nitrogen;
radiation interception; radiation use efficiency; and dry matter production
H03116; Received 24 December 2003; accepted 15 July 2004; Online publication
date 9 September 2004
New Zealand Journal of Crop and Horticultural Science, 2004, Vol. 32:
263-272
0014-0671/04/3203-0263 $7.00 © The Royal Society of New Zealand
2004
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