EFFECT OF DIFFERENT ORGANIC SOURCES ON SOIL ORGANIC CARBON POOLS, NUTRIENT CONTENT AND YIELD OF RICE UNDER FLOODED AND AEROBIC METHOD OF RICE CULTIVATION
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Date
41837
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Publisher
University of Agricultural Sciences GKVK, Bangalore
Abstract
Organic matter is critical to maintenance of soil fertility and
productivity. Thus it is very important to understand the pools of the
organic carbon and their distribution under different method of rice
cultivation. The experiment was laid out in split plot design with seven
treatments replicated thrice at ZARS, V.C. Farm Mandya to study the
effect of different organic sources on soil organic carbon pools,
nutrient content and yield of rice under flooded and aerobic system.
The investigation revealed that the application of organic sources
along with RDF increased the organic carbon content compared to
control (only RDF). The increase was higher in flooded method of
cultivation compared system. The SOC, EOC, POC, LFOC, MBC and
MBN content was higher in aerobic method compared to flooded
method. The labile carbon fractions viz., EOC, POC, LFOC, MBC and
MBN content decreased progressively with time. The EOC, MBC and
MBN content was higher in the treatment received RDF along with
daincha. While POC was higher in biochar treatment. Yield of rice was
significantly higher due to incorporation of organic manure + RDF
compared to control. Among the organic manure higher grain and
straw yield was obtained with daincha (4137 kg ha-1 and 4964 kg ha-1,
respectively). The correlation between SOC with EOC, LFOC, POC,
MBC and MBN was positive and significant under both the method of
cultivation.
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Keywords
carbon, rice, organic fertilizers, crops, fertilizers, crop residues, organic soils, land resources, farmyard manure, fractionation