ISSN:
1573-5036
Keywords:
CH4 emissions
;
denitrification
;
gas entrapment
;
rice soils
;
stable N isotopes
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract In a field experiment using microplots, a flooded Crowley silt loam (Typic Albaqualfs) rice soil was fertilized with 15N labelled (60–74 atom %) urea and KNO3. Emission of N2, N2O and CH4 and accumulation in soil were measured for 21 d after fertilizer application. Emission of 15N2-N measured from the urea and KNO3 treated plots ranged from 〈15 to 570 and from 330 to 3,420 g ha−1 d−1, respectively. Entrapped 15N2-N in the urea treated microplots was significantly lower (〈15 g to 2.1 kg ha−1) on all sampling dates compared to the 15N2-N gas accumulation in the KNO3 treated plots (6.4 to 31.5 kg ha−1). Emissions of N2O-N were low and did not exceed 4 g ha−1 d−1. Fluxes of CH4 from the fertilizer and control plots were low and never exceeded 33 g ha−1 d−1. Maximum accumulation of CH4 in the flooded soil measured 460 and 195 g ha−1 for the urea and KNO3 treatments, respectively.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00032422
