Urea Transformation in Clayey Soil Affected by using Synthetic and Natural Inhibitors under Laboratory Soil Incubation
Keywords:
Urease inhibitors, Nitrification inhibitors, Soil incubationAbstract
This study investigates the effect of urea with commonly applied rate by farmers and soil analysis rate and using synthetic and natural inhibitors associated with urea based on soil analysis rate on soil N transformation in form of ammonium and nitrate under laboratory soil incubation for 42 days. Seven inhibitors used in this study were (1) NBPT (N-(n-butyl) thiophosphoric triamide), (2) DMPP (dimethylpyrazole phosphate), (3) NBPT+DMPP, (4) garlic (Allium sativum), (5) ground neem seed (Azadirachta indica), (6) garlic+ground neem seed and (7) praxelis (Praxelis clematidea (Griseb.) R.M. King & H. Rob). The result showed that the application of N fertilizer at commonly applied by farmer rate had a greater soil inorganic N than soil analysis rate, but was not in proportion to the N rate applied. Moreover, NBPT, DMPP and praxelis tended to retain an accumulative ammonium by 15.49, 14.74 and 14.67% higher than only urea, respectively. All inhibitors had a potential for retarded nitrification rate up to 3 weeks by praxelis achieved 24.09% of inhibition of nitrification.
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