(2016) compared the effects of untreated urea and urea coated with either
DMPP (ENTEC[R]), nitrapyrin (eNtrench[TM]) or a 4-month release polymer (CoteN[TM]), on [N.sub.2]O emissions, sorghum yield and N use efficiency (NUE).
DMPP allows nitrogen to stabilize as [NH.sup.+.sub.4] for an eight-week period in the soil by inhibiting the conversion of ammonium into nitrate to reduce N losses.
The contribution of GG, a polycolloidal polymer, resulted with controlled release of DC from
DMPP to reach a maximum concentration in plasma.
Keywords: Allelopathy; Cultivars;
DMPP; Nitrogen; Organic residues; Wheat
This article highlights an important and growing issue identified from the
DMPP research.
Demand Mansagement and Planning Project (
DMPP) (2008).
DMPP (nitrification inhibitor) was added to ammonium treatments 4[micro]l [kg.sup.-1] soil.
This biosynthesis begins with the addition of IPP to dimethylallyl pyrophosphate (
DMPP) to forro a trans-, trans-, trans-geranylgeranylpyrophosphate.
An unfertilised control and five N-fertiliser treatments were established for each soil type, and are identified as: (i) nil; (ii) standard urea granules; (iii) standard urea granules treated with liquid nitrapyrin (eNtrench[TM]); (iv) 3,4-dimethylpyrazole phosphate (
DMPP) coated on standard urea granules (ENTEC[R]); (v) 3,4 dimethyl pyrazole glycolate (DMPG) coated on standard urea granules with proprietary solvent or wetting agent for improved inhibitor retention on the fertiliser granule; and (6) polymer-coated urea (PCU) granules (Agromaster Tropical[R]) with an approximate release period of 90 days (determined by the industry standard method of dissolution in water at a constant temperature).
Nitrification inhibitors at a glance: A number of compounds like dicyandiamide (DCD), nitrapyrin and 3,4-dimethylpyrazole phosphate (
DMPP) have been reported to inhibit the nitrification process in soils (Zerulla et al., 2001; Gioacchini et al., 2002; Majumdar et al., 2002; Irigoyen et al., 2003) andreduce nitrous oxide emissions and nitrate leaching (Zaman andBlennerhassett, 2010).
Iron oxide, [Fe.sub.3][O.sub.4], 20-50 nm (Sigma-Aldrich), 2,2-dimethoxy-2-phenylacetophenone,
DMPP (Sigma-Aldrich), poly(vinyl alcohol), and PVA (Sigma-Aldrich) were selected as the photo initiator and stabilizer, respectively.