caa a22 4500 477112269 CHVBK 20180405111612.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF02185562 doi (NATIONALLICENCE)springer-10.1007/BF02185562 Root, shoot and soil parameters required for process-oriented models of crop growth limited by water or nutrients [Elektronische Daten] [Meine van Noordwijk, Siebe van de Geijn] A review is given of the prospects for using process-oriented models of water and nutrient uptake in improving ‘integrated agriculture'. Government-imposed restrictions on the use of external inputs will increase the likelihood of (temporary) nutrient or water stress in crop production in NW Europe and thus a better understanding is required of shoot-root-soil interactions than presently available. In modelling nutrient and water uptake, three approaches are possible: 1) models-without-roots, based on empirically derived efficiency ratios for uptake of available resources, 2) models evaluating the uptake potential of root systems as actually found in the field and 3) models which also aim at a prediction of root development as influenced by interactions with environmental factors. For the second type of models the major underlying processes are known and research can concentrate on model refinement on the one hand and practical application on the other. The main parameters required for such models are discussed and examples are given of practical applications. For the third type of models quantification of processes known only qualitatively is urgently needed. Kluwer Academic Publishers, 1996 diffusion nationallicence models nationallicence nitrogen nationallicence nutrient uptake nationallicence phosphorus process-oriented nationallicence resource use nationallicence rooted volume nationallicence rooting density nationallicence root parameters nationallicence roots nationallicence spatial distribution nationallicence uptake models nationallicence water uptake nationallicence zero sink nationallicence van Noordwijk Meine Research Institute for Agrobiology and Soil Fertility (AB-DLO), P.O. Box 14, 6700 AA, Wageningen aut van de Geijn Siebe Research Institute for Agrobiology and Soil Fertility (AB-DLO), P.O. Box 14, 6700 AA, Wageningen aut Plant and Soil Springer Netherlands; gopher://gopher.wkap.nl 183/1(1996-06-01), 1-25 0032-079X 183:1<1 1996 183 11104 https://doi.org/10.1007/BF02185562 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02185562 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- van Noordwijk Meine Research Institute for Agrobiology and Soil Fertility (AB-DLO), P.O. Box 14, 6700 AA, Wageningen aut NATIONALLICENCE 700 1- van de Geijn Siebe Research Institute for Agrobiology and Soil Fertility (AB-DLO), P.O. Box 14, 6700 AA, Wageningen aut NATIONALLICENCE 773 0- Plant and Soil Springer Netherlands; gopher://gopher.wkap.nl/ 183/1(1996-06-01), 1-25 0032-079X 183:1<1 1996 183 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer