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Pak. J. Bot., 47(5): 1657-1663, 2015. |
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Updated: 20-10-15 | ||||
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RESPONSE OF COTTON GENOTYPES TO BORON UNDER B-DEFICIENT AND B-ADEQUATE CONDITIONS
JAVAID AHMED SHAH1*, ZIA-UL-HASSAN2, INAYATULLAH RAJPAR2 AND MAHBOOB ALI SIAL1
Abstract: Balanced boron (B) application is well-known to enhance the cotton production; however, the narrow range between B-deficiency and toxicity levels makes it difficult to manage. Cotton genotypes extensively differ in their response to B requirements. The adequate dose of B for one genotype may be insufficient or even toxic to other genotype. The effects of boron (B) on seed cotton yield and its various yield associated traits were studied on 10 cotton genotypes of Pakistan. The pot studies were undertaken to categorize cotton genotypes using B-deficient (control) and B-adequate (2.0 kg B ha-1) levels arranged in CRD with four repeats. The results indicated that the seed cotton yield, yield attributes and B-uptake of genotypes were comparatively decreased in B-deficient stressed treatment. Genotype NIA-Ufaq exhibited wide range of adaptation and ranked as “efficient-responsive”, as it produced higher seed cotton yield under both B-regimes. SAU-2 and CIM-506 were “highly-efficient” and remaining all genotypes were “medium-efficient”. Genotype Sindh-1 produced low seed cotton yield under B deficient condition and ranked as “low-efficient”. B-efficient cotton genotypes can be grown in B deficient soils without B application.
Key words: B-uptake, B-use efficiency, Gossypium hirsutum L., genotypic variation, Ranking methods.
1Nuclear Institute of Agriculture (NIA) Tandojam 2Department of Soil Science, Sindh Agriculture University, Tandojam *Corresponding author’s e-mail: jashah76@yahoo.com |
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