Organic matrix based slow release fertilizer enhances plant growth, nitrate assimilation and seed yield of Indian mustard (Brassica juncea L.).
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Date
2011-09
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Abstract
Field experiments were conducted to study the effect of organic matrix based slow release fertilizers (SRFs)
on plant growth, nitrate assimilation and seed yield of Brassica juncea L. cv. pusa bold. The agro-waste
materials like cow dung, clay soil, neem leaves and rice bran were mixed together in 2:2:1:1 ratio and used
as organic matrix for the immobilization of chemical fertilizer nutrients with commercial grade saresh (Acacia
gum, 15% solution) as binder. Different fertilizer treatments were organic matrix based slow release fertilizers,
SRF-I (542.0 kg ha-1); SRF-II (736.5 kg ha-1) and chemical fertilizer combinations, boron (3 kg ha-1)+sulphur
(15 kg ha-1)+nitrogen (80 kg ha-1) and boron (3 kg ha-1) + sulphur (15 kg ha-1)+nitrogen (80 kg ha-1)+phosphorus
(15 kg ha-1)+potassium (100 kg ha-1). Organic matrix based SRF-II released ammonium up to 50-d in wet soil
under laboratory conditions which showed maximum retention of the nutrients. A very significant increase in
plant growth, nitrate assimilation and seed yield was recorded in organic matrix based SRF-II applied plants.
The maximum percent increase in biomass production was observed with organic matrix based SRF-II
(increase of 65.8% in root fresh weight, 38.0% in root dry weight, 45.9% in leaf fresh weight plant-1 and 27.5
% in leaf dry weight plant-1 in 60-d old plants). It also increased the acquisition and assimilation of nitrate from
the plant’s rhizosphere which was evident by 45.6% increase in nitrate, 27.5% in nitrite and 11.7% in nitrate
reductase activity (NRA) in leaves of 45-d old plants over control. The organic matrix based SRF-II
significantly increased the seed yield by 28% in Indian mustard. Cost analysis revealed that this formulation
is cost effective as it is based on agro waste materials.
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Keywords
Chemical fertilizer, Organic matrix, Slow release fertilizer, Seed yield, Brassica juncea
Citation
Sharma Vinod K, Singh Rana P. Organic matrix based slow release fertilizer enhances plant growth, nitrate assimilation and seed yield of Indian mustard (Brassica juncea L.). Journal of Environmental Biology. 2011 Sept; 32(5): 619-624.