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  • 1
    Electronic Resource
    Electronic Resource
    Effect of a new nitrification inhibitor (wax coated calcium carbide) on transformations and recovery of fertilizer nitrogen by irrigated wheat (1992)
    Springer
    Nutrient cycling in agroecosystems 32 (1992), S. 1-11 
    Details
    ISSN: 1573-0867
    Keywords: Nitrogen loss ; denitrification ; acetylene ; irrigation ; urea ; nitrogen isotopes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effectiveness of wax coated calcium carbide to provide a slow release of acetylene to inhibit nitrification and denitrification in soil was evaluated in a field experiment with irrigated wheat (cv. Condor) grown on a red brown earth in the Goulburn-Murray Irrigation Region. The effect of the inhibitor treatments on biomass and grain yield was determined in 25 m × 3 m plots, and the effect on recovery, in the plant-soil system, of urea-N applied at sowing was determined in 0.3 m × 0.3 m microplots using a15N balance technique. The inhibitor limited ammonium oxidation, prevented nitrogen loss by denitrification for 75 days, increased N accumulation by the wheat plants, increased grain N and resulted in a 46% greater recovery of applied nitrogen in the plant-soil system at harvest. However, the inhibitor treatment did not increase grain yield because of waterlogging at the end of tillering and during stem elongation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01054388
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  • 2
    Electronic Resource
    Electronic Resource
    The fate of urea nitrogen applied in a foliar spray to wheat at heading (1991)
    Springer
    Nutrient cycling in agroecosystems 28 (1991), S. 129-138 
    Details
    ISSN: 1573-0867
    Keywords: Nitrogen loss ; volatilization ; micrometeorology ; gas exchange ; N-partition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Nitrogen losses from irrigated wheat (cv. Matong) grown on a heavy clay in the Goulburn-Murray Irrigation Region following foliar applications of urea at heading were investigated. Ammonia (NH3) volatilization was determined by a micrometeorological method and total nitrogen (N) loss was determined by a15N balance technique. The effects of the foliar application on grain N concentration and grain yield were determined also. Little nitrogen was lost by NH3 volatilization following the foliar application. The rate of NH3 loss increased briefly from 〈11 g N ha−1 hr−1 to 〉19 g N ha−1 hr−1 following rainfalls of 3 and 2 mm which washed 34% of the applied N from the plant onto the soil and increased the pH of the surface soil. The pH effect was short lived and total NH3 loss amounted to only 2.13 kg N ha−1 or 4.3% of the applied N. The15N balance study also showed that little N was lost from the plant-soil system until rain had washed the fertilizer from the plant onto the soil. In the period 152 to 206 DAS, the soil component of the applied N decreased from 34% to 9%. This fraction then increased slightly to 12% of the applied N at harvest. At that time, 69% of the applied N was recovered in the plants indicating that 19% of the applied N had been lost from the plant-soil system. As there was no evidence for leaching of N, the difference between total N loss as measured by15N balance (19%) and NH3 loss (4%) is considered to be loss by denitrification (15%). The fertilizer N assimilated by the plant was efficiently remobilised from the leaves and stems to the head; 78% of the fertilizer N assimilated by the plant tops had been translocated to the head by the time of harvest. Grain N concentration responded to the foliar N application. The fitted response function had significant linear (P = 0.004) and quadratic (P = 0.10) trends to N rate, whereas there was no significant effect on grain yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01049743
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