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TRANSFORMATION AND PLANT AVAILABILITY OF AMIDE NITROGEN IN SELECTED SAVANNA SOILS.
ABSTRACT
Amides added to soils are hydrolyzed to ammonium (NH) and their corresponding carboxylic acids+ Studies of 44 of amide – N in soils deserve attention because amides have potential as nitrogen (N) fertilizers. In this study, six amide compounds (acetamide, calcium cyanamide, dimethyl fornamide, phenyl acetamide, N, Ndimethyl acetamide and succinamide) were used. The potential of these amides as N fertilizer was determined through incubation, greenhouse and field experiments. Urea was used as the standard for comparison. Soils used for the incubation and greenhouse experiments came from Samaru, Mokwa and Bakura. The field trial was conducted at Samaru and the test crop used was maize (Zea mays L.). The transformations of amide – N (60)ugN/g of soil) were studied in field – moist soils incubated under aerobic conditions at 30 C for 8 weeks. All the amides were readily hydrolyzed in the three soils except dimethyl formamide which did not nitrify, with most of the amides studied, the inorganic N (NHL, NO” + NO”) produced was accumulated as 3 The recovery of N varied from 35% to 93%. Phenyl acetamide, N, N-dimethyl acetamide, CaCNL and Succinamide did not decrease the soil pH as much as urea while dimethyl formamide did not decrease the pH at all. In the greenhouse trial, maize responded to the application of the amide N fertilizers. The dry matter yield increase with rate of N application. Total DMY obtained with succinamide was not significantly different from that obtained with urea at the three rates of N application. That of acetamide tended to be lower than urea while phenyl acetamide was markedly inferior to other amides. The recoveries of N ranged from 51$ (phenyl acetamide) in Mokwa soil to 103% (succinamide) in Bakura soil. In the field, succinamide was similar to urea in the DMY and N uptake. The yield from acetamide was much lower than urea. The recoveries of N (at the rate of 120KgN/ha) ranged from 21% (CaCNL) to 68$ (succinamide). Generally, recovery of N from succinamide was better than urea and urea was followed by acetamide.
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