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By P. de Willigen (auth.), J. J. R. Groot, P. De Willigen, E. L. J. Verberne (eds.)

In the Netherlands the Institute for Soil Fertility examine performs a massive function in soil organic, soil actual and plant dietary learn at the availability of nitrogen to vegetation. major matters of analysis are nitrogen turnover within the crop-soil atmosphere via organic variations, nitrogen shipping throughout the soil and nitrogen losses through leaching, denitrification and volatilization, and nitrogen use potency of varied vegetation and cropping platforms. the present wisdom within the diversified fields of analysis is built-in in simulation types. Simulation types not just give the opportunity to summarize and constitution wisdom, but additionally, after verification, to additional- past due the data to events diversified from the occasions that experience really been studied. Such study is additionally performed in different ecu and non-European international locations. to match a few of the simulation versions at the moment in use, a workshop was once prepared by means of the Institute for Soil Fertility study on 5-6 June 1990 at the celebration of its centennial. The identify of the workshop used to be 'Nitrogen turnover within the soil-crop ::cosystem: modelling of organic alterations, shipping of nitrogen and nitrogen use efficiency'. The forty Jarticipants, who got here from Canada and numerous ecu nations, have been asked to run their version with facts Jrovided via the Institute sooner than the workshop. info from 18 circumstances have been made to be had to the contributors: 3 ocations, 3 remedies, and seasons.

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Extra info for Nitrogen Turnover in the Soil-Crop System: Modelling of Biological Transformations, Transport of Nitrogen and Nitrogen Use Efficiency. Proceedings of a Workshop held at the Institute for Soil Fertility Research, Haren, The Netherlands, 5–6 June 1990

Sample text

Nitrogen transformationsand plant uptake The nitrogen transformation reactions considered in LEACHN are: Input data ammonia(gas) r k4 kl urea~ Cl k2 ammonium~ C2 and 2) plant growth is not limited by any environmental factor (temperature,water or nitrogen supply) and dependsonly on time. Therefore, the simulation objectives were limited to the evaluationof LEACHN in a situation where the effects of plant growth on soil water and mineral nitrogen could be considerednegligible in comparisonto other nitrogen or water sinks or sourcessuch as drainage,fertilizer additions, or chemical transformations and transport.

Kg N ha- 1) n 80 , Eest Nl 70 - r a t e C 0 n t e n t Farm 'the Eest' (mm) 400 --rCt-c--=- - - - 0 r t 350- r 300 e 11 0 o u 250 C o n t e n t 200 150 100 50 - I simulated [I o ---'----"---o 30 60 20 10 0 0 168 198 90 120 150 180 210 ----J measured 240 270 300 330 360 time (days) Fig. 7. Comparisonof measuredand simulated water contents in the soil (0-100 cm, treatment Nl) in 1983-1984 (1/09/83 to 3110R/84). n 80 228 258 288 318 348 time (days) t60 Eest N3 70 r a t e c 0 60 50 40 30 0 I n 20 ~ e 10 t n 0 r ~ 0 168 t 50 These values were also maintainedduring the three fertilization treatments for the same reasonsas before.

Mineral-N pools include ammoniumand nitrate. Organic-N is distributed over litter, faeces, and humus. Organic carbon pools are included for both litter and faeces to control nitrogen mineralization and immobilization rates. g. crop residues,dead roots, microbial biomass) constitute the litter component,while the humus consists of stabilized decompositionproducts. Mineralization of humus-N (Nh . -. ~ I I I -----~ REDISTRIBUTI ON OF N BETW EE N LAYERS Fig. 1. Structureof the soil nitrogen model, showingstatevariables (boxes) and flows (arrows) includedin the model.

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