caa a22 4500 477110363 CHVBK 20180405111607.0 cr unu---uuuuu 170330e19960101xx s 000 0 eng 10.1007/BF00011168 doi (NATIONALLICENCE)springer-10.1007/BF00011168 Evaluation in field conditions of a three-dimensional architectural model of the maize root system: Comparison of simulated and observed horizontal root maps [Elektronische Daten] [Sylvain Pellerin, Loïc Pagès] Most existing water and nutrient uptake models are based on the assumption that roots are evenly distributed in the soil volume. This assumption is not realistic for field conditions, and significantly alters water or nutrient uptake calculations. Therefore, development of models of root system growth that account for the spatial distribution of roots is necessary. The objective of this work was to test a three dimensional architectural model of the maize root system by comparing simulated horizontal root maps with observed root maps obtained from the field. The model was built using the current knowledge on maize root system morphogenesis and parameters obtained under field conditions. Simulated root maps (0.45 × 0.75 m) of horizontal cross sections at 3 depths and 3 dates were obtained by using the model for a plant population. Actual root maps were obtained in a deep, barrier-free clay-loamy soil by digging pits, preparing selected horizontal planes and recording root contacts on plastic sheets. Results showed that both the number of cross-sections of axile roots, and their spatial distribution characterized with the R-index value of Clark and Evans (1954), were correctly accounted for by the model at all dates and depths. The number of cross-sections of laterals was also correctly predicted. However, laterals were more clustered around axile roots on simulated root maps than on observed root maps. Although slight discrepancies appeared between simulated and observed root maps in this respect, it was concluded that the model correctly accounted for the general colonization pattern of the soil volume by roots under a maize crop. Kluwer Academic Publishers, 1996 maize nationallicence root growth model nationallicence root mapping nationallicence root spatial distribution nationallicence root system nationallicence Zea mays L nationallicence Pellerin Sylvain INRA Laboratoire d'Agronomie, 28 Rue de Herrlisheim, B P 507, F-68021, Colmar, France aut Pagès Loïc INRA Laboratoire d'Agronomie, 28 Rue de Herrlisheim, B P 507, F-68021, Colmar, France aut Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl 178/1(1996-01-01), 101-112 0032-079X 178:1<101 1996 178 11104 https://doi.org/10.1007/BF00011168 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00011168 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pellerin Sylvain INRA Laboratoire d'Agronomie, 28 Rue de Herrlisheim, B P 507, F-68021, Colmar, France aut NATIONALLICENCE 700 1- Pagès Loïc INRA Laboratoire d'Agronomie, 28 Rue de Herrlisheim, B P 507, F-68021, Colmar, France aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl/ 178/1(1996-01-01), 101-112 0032-079X 178:1<101 1996 178 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer