Nitrogen Mineralization in Soils Previously Amended with Organic Wastes¹

Abstract

Long‐term aerobic incubations were conducted on soils previously amended with cow and poultry manure, sewage sludge, and mycelium to determine N mineralization potential (No) and N mineralization rate constant (k). Values for No were higher than those reported by other workers. The k values varied among soils sufficiently so that a single value could not be assumed for any one group of soils. Corn (Zea mays L.) was grown on five of the soils used in the incubation study. Soil moisture and soil temperature data from NoN0 and initial mineral N, estimates of N available to the crop. Yield and N uptake correlated well with the parameter No × k, but No alone proved to be a very poor predictor of yield or N uptake. K values, which can be estimated only from lengthy incubations, are required to obtain accurate estimates of N availability.

Predicting soil nitrogen supply from soil properties

“…This agrees with findings that soil organic N is a good predictor of N 0 in data sets with sufficient variation in soil organic N (Griffin and Laine 1983;Cabrera and Kissel 1988;Mallory and Griffin 2007 Stepwise multiple regression was used to develop equations relating soil properties and mineralizable N pools to N 0 (Table 5). The regression equation explained 66% of the variability in N 0 .…”

Potencial de mineralização de N e de C em vinte solos de Pernambuco

“…As quantidades de N mineralizado, na camada de 0-20 cm, foram proporcionais ao N total dos 20 solos (Figura 5b), resultado também encontrado por outros autores (Campbell et al, 1981;Griffin & Laine, 1983;Dalal & Mayer, 1987;Camargo et al, 1997). Separando os solos por zona, os coeficientes de determinação entre as duas variáveis foram maiores (em ambas, R 2 = 0,64; p < 0,01), o que está mais de acordo com o fato de o N total mineralizado nos solos da zona úmida (média de 5,9%) ter sido significativamente superior ao da zona semi-árida (3,9%).…”

Mineralization Rate Constants and Their Use for Estimating Nitrogen Mineralization in Some Canadian Prairie Soils

“…The potentially mineralizable nitrogen (No) and the mineralization rate constant (ft) were claculated from the cumulated net nitrogen mineralized (N,) and time (t) data by assuming first order kinetics and using a non-linear regression computer iteration program (Campbell et al 1981 N,=No(l-e*') (1) where N, is cumulated net nitrogen mineralized (!rg'g ''wk-'), r : time (wk) and t, the rate constant, is the product of a temperature function (determined elsewhere in this paper) and the moisture function of Myers et al (1982) .First, There is some uncertainty regarding how to mathematically handle the influence of the environmental factors on mineralization since there are several possibilities to combine these factors (Frissel and Van Veen 1982). However, we used the product of the temperature and moisture functions as done by others (Oyanadel and Rodriquez 19'7'1; Griffin and Laine 1983).…”