Effects of gibberellic acid spray on nitrogen yield efficiency of mustard grown with different nitrogen levels

Mustard is cultivated throughout the world for oil in its seeds. Itrequires high nitrogen input for improved productivity but the nitrogen appliedto the soil is not fully utilised by the crops due to various constraints. Theobjective of the reported research was to determine if foliar- appliedgibber...

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Bibliographic Details
Published in:Plant growth regulation 2002-11, Vol.38 (3), p.243-247
Main Authors: KHAN, N. A, MIR, R, KHAN, M, JAVID, S, SAMIULLAH
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
Carbon dioxide
Chemical agents
Economic plant physiology
Efficiency
Fundamental and applied biological sciences. Psychology
Growth and development
Growth rate
Morphogenesis, differentiation, rhizogenesis, tuberization. Senescence
Nitrogen
Plant growth
Plant physiology and development
Seeds
Sprays
Studies
Vegetative apparatus, growth and morphogenesis. Senescence
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Summary:Mustard is cultivated throughout the world for oil in its seeds. Itrequires high nitrogen input for improved productivity but the nitrogen appliedto the soil is not fully utilised by the crops due to various constraints. Theobjective of the reported research was to determine if foliar- appliedgibberellic acid (GA^sub 3^) could enhance crop growth and increasenitrogen-use efficiency. A field experiment was conducted during 1997-98in which GA^sub 3^ (10^sup -5^ M) was applied tofoliage at 40d after sowing (pre-flowering) to mustard grown with 0, 40(sub-optimal), 80 (optimal) and 120 (supra-optimal) kgN ha^sup -1^. Foliar spray of GA^sub 3^ was effectiveonly when plants received sufficient N (80 kgN ha^sup -1^). GA^sub 3^ sprays significantly enhancedplant dry mass, leaf area, carbon dioxide exchange rate, plant growth rate,cropgrowth rate and relative growth rate. GA^sub 3^ -treated plants showedenhanced nitrogen-use efficiency through redistribution of N to seeds.[PUBLICATION ABSTRACT]
ISSN:0167-6903
1573-5087
DOI:10.1023/A:1021523707239