Titlebook: Nitrogen Turnover in the Soil-Crop System; Modelling of Biologi J. J. R. Groot,P. Willigen,E. L. J. Verberne Conference proceedings 1991 Sp

能量守恒

,WHNSIM — a soil nitrogen simulation model for Southern Germany,A one-dimensional deterministic soil nitrogen simulation model (WHNSIM) is presented. With the model the leaching of soil nitrate, its uptake

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Modelling nitrogen dynamics in a plant-soil system with a simple model for advisory purposes,ling the water regime in soils with fluctuating water tables. A major problem seems to be the ‘disappearance’ of fertilizer N. Measurements by the fumigation-extraction method of microbial N during the growing season show that disappearance of fertilizer N can partly be explained by immobilization by the microbial biomass.

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978-94-010-5518-5Springer Science+Business Media Dordrecht 1991

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arch on the availability of nitrogen to crops. Main subjects of research are nitrogen turnover in the crop-soil ecosystem through biological transformations, nitrogen transport through the soil and nitrogen losses by leaching, denitrification and volatilization, and nitrogen use efficiency of variou

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Quantitative aspects of nitrogen nutrition in crops,oncluded that the present insight in the relevant processes is insufficient to use deterministic models directly for application in fertilizer practices at the farm level, but that further development of such models is an important aid in structuring thinking about the system.

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Simulation of soil nitrogen dynamics using the SOILN model,ut the growing season is available, mineral-N dynamics in soil can be satisfactorily described with this model. The main problems identified in the simulations were related to the partitioning between above- and below-ground plant-N, and supplying the crop with sufficient N, as given by the measurements.

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Nitrogen turnover in the soil-crop system; comparison of fourteen simulation models,und processes was less problematic than that of the belowground processes. None of the models could account for the loss of mineral nitrogen occurring shortly after application of fertilizer in late spring and early summer.

旧石器时代

Some results of nitrogen simulations with the model ANIMO,ion of nitrogen uptake by the crop was satisfactory. The simulation of mineral nitrogen in the soil agreed reasonably well with measured data for one of the experiments used for the analysis. The agreement was less for experiments with additional fertilizer applications in May and June.