Journal of Food, Agriculture and Environment

Growth and dry matter partitioning of soybean under variable nitrogen supplies and elevated CO₂

Author(s):

Avinash C. Srivastava ^*, Yoginder P. Khanna

Recieved Date: 2003-01-11, Accepted Date: 2003-08-29

Abstract:

This study was conducted to determine reciprocal effects of low to high doses of nitrogenous fertilizer (N₃₀– 30 kg ha^-1, N₄₀– 40 kg ha^-1, N₅₀– 50 kg ha^-1, N₆₀– 60 kg ha^-1, N₇₀– 70 kg ha^-1) and CO₂ enriched environment on growth and dry matter partitioning in soybean (Glycine max (L.) Merril cv JS-335). Plants were grown from seedling emergence to maturity inside open top chambers under ambient CO₂ (350±50 µmol mol^-1) and elevated CO₂ (600±50 µmol mol^-1) and analyzed at seedling, vegetative, flowering, pod forming and harvesting stages. Soybean responded to both CO₂ enrichment and nitrogen supply. Plants grown under CO₂ enrichment were taller and attained greater leaf area, root and shoot growth along with more dry matter at all growth stages. Growth of the plant under elevated CO₂ was further enhanced with the increase in nitrogen application. However, optimum growth and yield response to soybean was obtained at 60 kg ha^-1 of nitrogen instead of its recommended dose 50 kg hac^-1 or low (30-40 kg hac^-1) and high (70 kg hac^-1) nitrogen doses. Response to high CO₂ also depends upon the growth stage of the plant and it was more at vegetative and flowering stages compared to maturity stages. Our study indicates that reassessment of critical nitrogen concentration of soybean at regional and global level is needed in the present atmospheric conditions for getting maximum production under changing climate.

Keywords:

Elecated CO₂, dry matter, growth, nitrogen, Glycine max

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Journal: Journal of Food, Agriculture and Environment
Year: 2003
Volume: 1
Issue: 3&4
Category: Agriculture
Pages: 162-167

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