S223 : Ultrasonic waves and drought impact on the growth and yield of corn
Thesis > Central Library of Shahrood University > Agricultural Engineering > MSc > 2015
Authors:
Abstarct: to study the interactive effects of ultrasouns and drought stress on some traits of corn
A filed experiment with 3 replications was conducted in research farm of Shahrood
University in 2014. Treatments were factorial arrangement of three levels of drought
stress (control, no irrigation from flowering stage onward, and no irrigation from
dough stage onward) and five levels of ultrasound (control, 2, 4, 6 and 8 minutes
exposure to 42 kHz). The results showed that drought stress significantly decreased
the amount of leaf area index, shoot dry weight, leaf dry weight, seed dry weight, dry
weight of ear cover, ear diameter, number of rows per ear, cob weight, the biological
yield, grain yield, leaf relative water content and the amount of carotenoids as
compare to control. In comparison to control, the value of reduction in these traits
was 37%, 39%, 33%, 21%, 13%, 14%, 37%, 3%, 25%, 40%, 50%, 19%, 46% and
31%, respectively. Stress caused an increase in the amount of soluble sugars and
harvest index by 19% and 11%, respectively compare to control. Ultrasound also
increased shoot dry weight (9%), leaf dry weight (3%), grain weight (5%), ear
diameter (18%), number of ears (8%), biological yield (15%), grain yield (43%), HI
(38%), soluble sugars (28%) , leaf relative water content (19%) and germination rate.
The interaction between stress and ultrasound was significant for plant height, stem
diameter, seed protein content, contents of chlorophyll a and b. In the present study
the possibility of using ultrasonic waves as a seed treatment to reduce the damage
caused by water stress, there is an increase in quantity and quality.
Keywords:
#Corn #Drought #qualitative and quantitative traits #ultrasonic waves Link
Keeping place: Central Library of Shahrood University
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Keeping place: Central Library of Shahrood University
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