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  • 1
    Electronic Resource
    Electronic Resource
    Simulating water and nitrogen behaviour in soils cropped with winter wheat (1991)
    Springer
    Nutrient cycling in agroecosystems 27 (1991), S. 233-243 
    Details
    ISSN: 1573-0867
    Keywords: Nitrogen transport ; crop production ; moisture retention characteristic ; ammonia adsorption ; simulation ; organic N transformations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The SWATNIT model [26], predicting water and nitrogen transport in cropped soils, was evaluated on experimental data of winter wheat for different N treatments. The experiments were monitored at three different locations on different soil types in the Netherlands. Crop growth was simulated using the SUCROS model [11] which was integrated in the SWATNIT model. Both water and nitrogen stress were incorporated. Except for the soil hydraulic properties, all model parameters were taken from literature. The model performance was evaluated on its capability to predict soil moisture profiles, nitrate and ammonia profiles, the time course of simulated total dry matter production and LAI; and crop N-uptake. Results for the simulations of the soil moisture profile indicate that the soil hydraulic properties did not reflect the actual physical behaviour of the soil with respect to soil moisture. Good agreement is found between the measured and simulated nitrate and ammonia profiles. The simulation of the nitrate content of the top layer at Bouwing was improved by increasing the NH 4 + -N-distribution coefficient thereby improving the simulation of the NH 4 + -N-content in this layer. Deviations between simulated and measured nitrate concentrations also occurred in the bottom layers (60–100 cm) of the soil profile. The phreatic ground water might influence the nitrate concentrations in the bottom layers. Concerning crop growth modelling, improvements are needed with respect to the partitioning of total dry matter production over the different plant organs in function of the stress, the calculation of the nitrogen stress and the total nitrogen uptake of the crop through a better estimate of the N-demand of the different plant organs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01051130
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of carbon availability on the production of NO, N2O, N2 and CO2 by soil cores during anaerobic incubation (1996)
    Springer
    Plant and soil 181 (1996), S. 145-151 
    Details
    ISSN: 1573-5036
    Keywords: aerobic preincubation ; available carbon ; CO2 production ; denitrification ; N2O/N2 ratio ; water soluble carbon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Net productions of permanent soil atmosphere gases (N2, CO2, O2) and temporary gases (N2O, NO) were monitored in soil cores using a non-interfering, fully automated measuring technique allowing highly time resolved measurements over prolonged periods. The influence of changes in available organic carbon on CO2, N2O, NO and N2 production was studied by changing the soil carbon content through aerobic preincubations of different length, up to 21 days. The aerobic preincubation caused an increase in NO3 - concentration and a decrease in available carbon content. Available carbon content dominated both CO2 and total N gas (N2+N2O+NO) production during anaerobiosis. Both CO2 and total N gas production rates decreased with increasing length of the previous aerobic preincubation, this in spite of the higher initial NO3 - concentration. Total denitrification rates were closely related to the anaerobic CO2 production rates. No relation was found between water soluble carbon content and total denitrification. The N2O/N2 ratio could be explained by an interaction of carbon availability, NO3 - concentration and enzyme status. Net N2O consumption was monitored. The balance between cumulative total N gas production and NO3 - consumption varied according to the different treatments. Cumulative N2O production exceeded cumulative N2 production for 0 up to 5 days.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011301
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    Paper (German National Licenses)
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