scholarly journals Aerobic and anaerobic incubation: Biological indexes of soil nitrogen availability

2005 ◽  
pp. 45-57
Author(s):  
Mirjana Kresovic ◽  
Svetlana Antic-Mladenovic ◽  
Vlado Licina
Keyword(s):  
Forest Soil ◽  
Soil Nitrogen ◽  
Nitrogen Availability ◽  
Nitrogen Fertilizers ◽  
Soil Parameters ◽  
Anaerobic Incubation ◽  
Brown Forest Soil ◽  
Biological Index ◽  
Soil Nitrogen Availability ◽  
Aerobic And Anaerobic

Our researches have been made on brown forest soil that had been used in long-term experiments set up according to specified fertilization system for over 30 years. We have chosen those experiment variants in which quantities of nitrogen fertilizers were gradually increased. The soil samples taken from 0 cm to 30 cm depth were used to determine biological indexes of nitrogen availability (aerobic and anaerobic incubation). The same samples were also used for pot experiments with oat. Plant and soil parameters obtained in controlled conditions were used for determination of biological indexes reliability in measuring the soil nitrogen availability. On the grounds of correlation analysis, it can be concluded that biological index of nitrogen availability achieved by the anaerobic incubation (without substraction of the initial content of available nitrogen) of the investigated brown forest soil is the reliable indicator of soil nitrogen availability. That is not the case with the aerobic incubation in which reliability has not been established.

scholarly journals Estimation of soil nitrogen availability

2003 ◽  
Vol 48 (1) ◽  
pp. 21-38
Author(s):  
Mirjana Kresovic ◽  
V. Licina
Keyword(s):  
Crop Rotation ◽  
Soil Nitrogen ◽  
Nitrogen Availability ◽  
Nitrogen Fertilizers ◽  
Soil Parameters ◽  
Controlled Environment ◽  
Brown Forest Soil ◽  
Soil Nitrogen Availability ◽  
Long Term Experiments

Our research has been made on brown forest soil that is used in long-term experiments. The soil we used had a certain crop rotation (wheat-corn) and had been fertilized according to a certain system for 30 years. In the experiment, quantities of nitrogen fertilizers were gradually increased after which samples were taken from O to 30 cm depths in order to establish plant and soil parameters for assessing the applied methods. Two experiments were made: one in the field and one in a controlled environment. On grounds of the established correlation interdependence between the methods applied (the total and easily hydrolyzed nitrogen) and the plant and soil parameters, in both field and pots, one can conclude that the methods of total and easily hydrolyzed nitrogen, from the standpoint of nitrogen availability in soil, are reliable. In the method of total nitrogen assessment, one should rely on the parameters regarding plants and soil in the field. In the method of easily hydrolyzed nitrogen, the parameters regarding plants and soil, in both the field and pots, are the same.

scholarly journals Evaluation of optimal time and parameters for measuring potentially mineralized nitrogen in soil

2008 ◽  
pp. 41-49
Author(s):  
Mirjana Kresovic ◽  
Vlado Licina ◽  
Svetlana Antic-Mladenovic
Keyword(s):  
Early Spring ◽  
Optimal Time ◽  
Soil Parameters ◽  
Anaerobic Incubation ◽  
Aerobic Incubation ◽  
Brown Forest Soil ◽  
Controlled Conditions ◽  
Long Term Experiments ◽  
Aerobic And Anaerobic

Our research was done on brown forest soil with long-term experiments and with a system of fertilizing which is in use for 40 years. Experiment variants with an increasing dose of nitrogen fertilizer were chosen for this research. Two experiments have been performed: experiment in pots supplied with ammonium nitrate labeled with a stable isotope 15N (11.8%) and experiment in the field. The aim of the research was to establish which plant and soil parameters group (obtained in the controlled conditions and/or in the field) could be considered as reliable for evaluation of aerobic and anaerobic incubation and of the best time for estimation of potentially mineralized nitrogen in soil. According to the determined correlative dependence, it could be concluded that reliability of aerobic incubation should be estimated in October by plant and soil parameters from field, anaerobic incubation should be estimated in early spring (March) by plant and soil parameters, from controlled conditions (pots) and from field.

scholarly journals Estimation of chemical availability indexes of soil nitrogen

2008 ◽  
Vol 53 (2) ◽  
pp. 99-112
Author(s):  
Mirjana Kresovic ◽  
Vlado Licina ◽  
Svetlana Mladenovic-Antic
Keyword(s):  
Forest Soil ◽  
Soil Nitrogen ◽  
Nitrogen Fertilizer ◽  
Hot Water ◽  
Soil Parameters ◽  
Brown Forest Soil ◽  
Chemical Methods ◽  
Controlled Conditions ◽  
Chemical Availability

The researches were performed on brown forest soil used within stationary experiment with a certain fertilizing system for more than 40 years. Researches were made on experiment variants where the increasing dosage of nitrogen fertilizer was applied. The aim of the research was to establish which plant and soil parameters (pots and/or field) might be considered reliable to evaluate values of applied chemical methods (hot water method and easily hydrolyzing nitrogen), being methods used to evaluate potentially mineralized nitrogen in soil. We also wanted to establish the most favorable time to evaluate the values of applied methods (March, July and October). On the basis of established correlation dependences, the plant and soil parameters, either from pots or fields should be used to evaluate the reliability of the hot water method and the reliability of mentioned methods can be estimated in March, July and October. As for the evaluation of easily hydrolyzing nitrogen, we can use both plant and soil parameters in controlled conditions and in the field and the most suitable time is in spring (March) and in fall (October).

scholarly journals Determining fertilizer quantities required for wheat

2003 ◽  
Vol 48 (1) ◽  
pp. 39-58 ◽  
Author(s):  
Mirjana Kresovic ◽  
V. Licina
Keyword(s):  
Soil Nitrogen ◽  
Nitrogen Fertilizer ◽  
Reliable Method ◽  
Nitrogen Availability ◽  
Calculation Model ◽  
Nitrogen Utilization ◽  
Brown Forest Soil ◽  
Soil Nitrogen Availability ◽  
Long Term Experiments

In this experiment we used brown forest soil that has been used in long-term experiments, for 30 years, with increasing doses of introduced nitrogen fertilizer in variants. In order to determine the quantities of nitrogen fertilizer required for wheat, a calculation model has been applied. This calculation requires not only a reliable method for determining soil nitrogen availability (both the total and easily hydrolyzed nitrogen method were used), but also a reliable method for determining the coefficient of nitrogen utilization from soil as well as data on the coefficient of nitrogen utilization from fertilizer (Nani) for the added quantities of nitrogen fertilizer.

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