Effect of Planting Density and Chlormequat Chloride on Morphological and Physiological Characteristics of Winter Barley (Hordeum vulgare L.) Cultivar "Valfajr"
محل انتشار: مجله علوم و فناوری کشاورزی، دوره: 2، شماره: 2
سال انتشار: 1379
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 74
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شناسه ملی سند علمی:
JR_JASTMO-2-2_008
تاریخ نمایه سازی: 22 آبان 1402
چکیده مقاله:
In a field experiment the effect of five planting densities (۱۰۰, ۱۷۵. ۲۵۰, ۳۲۵ and ۴۰۰
plants in"۲ ) with or without foliar application of chlormequat chloride (۲-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 ۳۲).
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 ۲۵(۱ plants in"۲ increased the grain yield, however, from ۲۵۰ to ۴۰۰ plants m"۲ there
was no significant change in grain yield. It appeared that the higher planting
densities, i.e. ۲۵۰ to ۴۰۰ 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.
کلیدواژه ها:
نویسندگان
Y. Emam
Department of Agronomy, College of Agriculture, Shiraz University, Shiraz, Islamic Republic of Iran.
G. R. Moaied
Agricultural Research Center, Darab, Islamic Republic of Iran.