New Zealand Journal of Crop and Horticultural Science abstracts
Interference between shatter cane (Sorghum bicolor) and soybean
(Glycine max)
Y. Raey
Department of Agronomy and Plant Breeding
Faculty of Agriculture
University of Mohaghegh Ardebili
Ardebili, Iran
email: yaegoob@yahoo.com
K. Ghassemi-Golezani
A. Javanshir
H. Alyari
S. A. Mohammadi
Department of Agronomy and Plant Breeding
Faculty of Agriculture
University of Tabriz
Tabriz, Iran
Abstract A field study was conducted to evaluate the
effects of shatter cane (Sorghum bicolor) and soybean (Glycine
max) densities on soybean seed yield and to quantify interspecific and
intraspecific interference coefficients. The relations between soybean seed
yield per plant and shatter cane density at different densities of soybean
and also with soybean density at different densities of shatter cane are
well described by the reciprocal equations. Soybean seed yield per unit area
decreased with increasing shatter cane density. The highest yield loss (57%)
was relative to 50 and 12 plants/m2 of soybean and shatter cane
densities, respectively. Optimum soybean densities on the basis of maximum
soybean seed yield per unit area at 0, 4, 8, and 12 plants/m2
of shatter cane were achieved at 50, 34, 32, and 36 plants/m2,
as estimated by the asymptotic or parabolic relations between soybean seed
yield per unit area and soybean densities at different shatter cane densities.
Shatter cane was a stronger competitor than soybean, as a shatter cane plant
was equal to 2.5 soybean plants, based on soybean seed yield. In contrast,
a soybean plant was equal to 0.18 of a shatter cane plant, on the basis of
shatter cane biomass. It was, therefore, concluded that the superior competitor
was mostly affected by intraspecific interference, but the weaker competitor
was mostly affected by interspecific interference.
Keywords soybean; shatter cane; interference
H03096; Online publication date 8 March 2005 Received 15 October 2003;
accepted 4 October 2004
New Zealand Journal of Crop and Horticultural Science, 2005, Vol. 33:
53–58
0014-0671/05/3301-0053 © The Royal Society of New Zealand 2005
PDF file of entire paper: Print-quality (127K) |
screen-quality (92K)
This year's abstracts |
Journal home page |
All abstracts |
Publishing home page
