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• W2077463075 abstract "By means of linear, linear-transformed and non-linear statements, the relationship is discussed between soil temperature and soil moisture on the one side and nitrification in the upper layers of a bare soil on the other. The results of the methods are compared. It is established that a non-linear model gives more information than any other. By means of the linear statements only the influence of soil temperature is discovered, whereas the non-linear model gives the combined action of soil temperature and soil moisture on the formation of NO3-N. The non-linear model is based on a known model of the weather-yield statistics. By means of a square function, a hyperplane is fitted on the observed data and is resolved into components, resulting in a response hyperboloid, of which the surfaces of equal response are conic sections. By means of known formulae from analytic geometry, the Eigen-values and Eigen-vectors of the square form are calculated from the coefficients of the components to determine the type of the conic sections and they are used for criteria of the effectiveness of the parameters. The Eigen-vectors show that soil temperature and soil moisture are independent in their influence on the nitrification, while the Eigen-values indicate that the efficiency of the parameters is almost identical. The amount of NO3-N increased with rising soil temperature. In the relation to soil moisture there is an optimum near the field capacity. Falling soil temperature in autumn and winter results in a decrease of NO3-N, but only towards a fixed minimum. Calculations by use of the non-linear model result in a minimum of nearly 2 p.p.m., which is in conformity with common observations. A considerable increase of NO3-N in spring, indicative of the beginning of micro-organic activity, results only after the soil temperature exceeds 5°C, even if the soil moisture is near the optimum. All results are valid only according the material used and are therefore to be regarded more qualitatively than quantitatively." @default.
• W2077463075 created "2016-06-24" @default.
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• W2077463075 date "1971-01-01" @default.
• W2077463075 modified "2023-10-16" @default.
• W2077463075 title "Statistische betrachtungen zur frage der abhängigkeit der nitrifikation von bodentemperatur und bodenfeuchtigkeit" @default.
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• W2077463075 doi "https://doi.org/10.1016/0002-1571(71)90008-2" @default.
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