Journal of Agricultural Science and Technology
Journal of Agricultural Science and Technology
JAST
Agriculture
http://jast.modares.ac.ir
1
admin
1680-7073
2345-3737
10.22034/jast
en
jalali
1379
1
1
gregorian
2000
4
1
2
2
online
1
fulltext
en
Effect of Planting Density and Chlormequat Chloride on
Morphological and Physiological Characteristics of
Winter Barley (Hordeum vulgare L.)
Cultivar "Valfajr"
In a field experiment the effect of five planting densities (100, 175. 250, 325 and 400
plants in"2 ) with or without foliar application of chlormequat chloride (2-till o methyltrimethyl
uminonion chloride, CCC) on growth, development and grain yield of winter
barley (cv Valfajr) was studied. The results indicated that Increasing plant density
hastened the rate of apical development and stem elongation. This pattern continued
up to the beginning of rapid stem elongation phase (Zadoks growth stage 32).
However, during the rapid stem elongation and ear growth, the pattern was reversed
i.e. it had become slightly in favor of the lower densities. Increasing plant density up
to 25(1 plants in"2 increased the grain yield, however, from 250 to 400 plants m"2 there
was no significant change in grain yield. It appeared that the higher planting
densities, i.e. 250 to 400 plants m~- were in a range around the supposed "optimum"
density. Foliar application of CCC slowed down the rate of apical development and
stein elongation in all plant densities, hut without any significant effect on its spikelet
initiation rate. Such retardation of development in CCC-treatecl plants was initially
associated with lower dry weight accumulation. However, this trend was reversed
before anthesis, as the CCC- treated plants had accumulated more dry matter by anthesis,
and gave a higher grain yield. The interactive effect of CCC and plant density is
worthy of further exploration.
Yield components,Planting density,Growth regulation,Plant development
75
83
http://jast.modares.ac.ir/browse.php?a_code=A-10-1000-5337&slc_lang=en&sid=23
Y.
Emam
Y.
Emam
100319475328460044892
100319475328460044892
Yes
Department of Agronomy, College of Agriculture, Shiraz University, Shiraz, Islamic Republic of Iran.
Department of Agronomy, College of Agriculture, Shiraz University, Shiraz, Islamic Republic of Iran.
G. R.
Moaied
G. R.
Moaied
100319475328460044893
100319475328460044893
No
Agricultural Research Center, Darab, Islamic Republic of Iran.
Agricultural Research Center, Darab, Islamic Republic of Iran.