Thus from the present investigation it may be concluded that
integrated use of farmyard manure at 4 Mg ha1 and the
recommended dose of fertilizers in every crop season resulted
in the significant improvement in the physical properties of
Vertisol, i.e. decrease in bulk density, penetration resistance and
increase in hydraulic conductivity, soil aggregation and aggregate
associated carbon, compared to the sole use of fertilizer NPK and
non-use of fertilizer and manure. It was also observed that
integrated use of farmyard manure and recommended dose of
chemical fertilizers led to improvement in crop growth param-eters, viz., root length density, root mass density, leaf area duration,
biomass partitioning towards pod and resulted in higher nitrogen
uptake and higher grain yield and water and nitrogen use
efficiency of soybean than that of sole use of recommended dose
of fertilizers and non-use of fertilizers and manures. So integrated
use of farmyard manure at 4 Mg ha1 and recommended dose of
chemical fertilizers in every crop season may be practiced in
Vertisols to improve soil physical environment and enhance
carbon sequestration and for achieving higher productivity
through efficient utilization of water and nutrients in soybean.
Thus from the present investigation it may be concluded thatintegrated use of farmyard manure at 4 Mg ha1 and therecommended dose of fertilizers in every crop season resultedin the significant improvement in the physical properties ofVertisol, i.e. decrease in bulk density, penetration resistance andincrease in hydraulic conductivity, soil aggregation and aggregateassociated carbon, compared to the sole use of fertilizer NPK andnon-use of fertilizer and manure. It was also observed thatintegrated use of farmyard manure and recommended dose ofchemical fertilizers led to improvement in crop growth param-eters, viz., root length density, root mass density, leaf area duration,biomass partitioning towards pod and resulted in higher nitrogenuptake and higher grain yield and water and nitrogen useefficiency of soybean than that of sole use of recommended doseof fertilizers and non-use of fertilizers and manures. So integrateduse of farmyard manure at 4 Mg ha1 and recommended dose ofchemical fertilizers in every crop season may be practiced inVertisols to improve soil physical environment and enhancecarbon sequestration and for achieving higher productivitythrough efficient utilization of water and nutrients in soybean.
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