Nitrogen Mineralization as Influenced by Different Organic Manures in an Inceptisol in the Foothill Himalayas
2016
Sharma, Vikas | Mir, Sajad H. | Sharma, Anil
Nitrogen-use efficiency can be enhanced through an understanding of the nitrogen (N) mineralization behavior of organic sources. An incubation study was conducted to assess the impact of organic manures on N mineralization. The manures, farmyard manure (FYM), Leucaena leucocephala , and poultry manure, were applied to the soil alone or along with urea. There was a rapid increase in the amount of mineral N released with a peak appearing either at 14 days (+urea treatments) or 21 days (manure only) of aerobic incubation. Thereafter the net N mineralized decreased gradually and levelled off beyond day 56. Overall the cumulative net N mineralized after 98 days of incubation was in the order urea > Leucaena + urea > poultry manure + urea > FYM + urea > Leucaena > poultry manure > FYM > zero N. The potentially mineralizable N (N ₀) was lower in treatments where urea was not applied.
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