Abstract
The spatial arrangement of maize roots was studied in a clay loam field in order to test the regularity of root arrangement, which is implicitly assumed when distances between neighbouring roots are calculated. For that. we carried out a mapping of root contacts on six superposed horizontal planes which cut the rooting volume of several area samples. Three situations were studied: (i) one inter-row out of two was compacted down to the base of the ploughed layer (28 cm), but not in non-tilled layers (28 to 200 cm); (ii) a mechanical obstacle was placed at the base of the ploughed layer; (iii) one inter-row out of two was compacted down to half the depth of the ploughed layer. On all horizontal planes, the spatial arrangement or root contacts followed a non-regular, clustered pattern for a 10−2m scale of study, even in parts of soil which had not been disturbed by compactions. In the first two situations, where obstacles met the base of the ploughed layer, root density in non-tilled layers was several times lower below the obstacles than below the remaining parts of the ploughed layer. This caused a 10−1 m sized variability which was superimposed on to the 10−2 m one. Conversely in the third situation, obstacles had no appreciable effect on root density in non-tilled layers. Obstacles located at the base of the ploughed layer therefore prevented root access to non-tilled layer and caused a ‘shadow effect’ in the non-tilled layers. This effect is probably due to the main vertical direction of roots in these layers.
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References
Aubertin G M and Kardos L T 1965 Root growth through porous media under controlled conditions. I. Effect of pore size and rigidity. Soil Sci. Am. Proc. 29, 290–293.
Baldwin J P, Tinker P B and Nye P H 1972 Uptake of solutes by multiple root systems from soil. II Theoretical effects of rooting density and pattern on uptake of nutrients from soil. Plant and Soil 36, 693–708.
Barley K P 1963 Influence of soil strength on growth of roots. Soil Sci. 96, 175–180.
Cliff A D and Ord J K 1973 Spatial Autocorrelatio. Pion Ltd., London, 178 p.
Fies J C and Stengel P 1981 Densité texturale de sols naturels. II. Eléments d’interprétation. Agronomie 1, 659–666.
Gardner W R 1960 Dynamic aspects of water availability to plants. Soil Sci. 89, 63–73.
Gardner W R 1964 Relation of root distribution to water uptake availability. Agron. J. 56, 35–41.
Hewitt J S and Dexter A R 1984 The behaviour of roots encountering cracks in soil. II Development of a predictive model. Plant and Soil 79, 11–28.
Jordan M O 1986 Mise en place du système racinaire du Maïs. Définition et caractérisation au champ et en conditions contrôlées des paramètres descriptifs de la structure racinaire. Thèse Strasbourg I, 177 p.
Manichon H 1982 L’action des outils sur le sol: appréciation de leurs effets par la méthode du profil cultural. Sci. Sol. I 203–219.
Mengel D B and Barber S A 1974 Development and distribution of the corn root sytem under field conditions. Agron. J. 66, 341–344.
Nimah M N and Hanks R J 1973 Model of estimating soil water, plant and atmospheric interrelations. I Description and sensitivity. Soil Sci. Soc. Am. Proc. 37, 522–527.
Passioura J B 1985 Roots and water economy of wheat.In Wheat Growth and Modelling. Eds. W. Day and R. K. Atkin, 407 p. Nato Asi Series. Plenum Press, New York.
Rogers A 1974 Statistical Analysis of Spatial Distribution. The Quadrat Method. Pion Ltd., London, 164 p.
Rowse H R, Mason W K and Taylor H M 1983 A microcomputer simulation model of water extraction by soybeans. Soil Sci. 136, 218–225.
Soane B D, Campbell D J and Herkes S M 1971 Hand held gamma ray equipment for measurement of soil bulk density in the field. J. Agric. Eng. Res. 16, 146–156.
Stengel P 1979 Utilisation de l’analyse des systèmes de porosité pour la caractérisation des systèmes de porosité in situ. Ann. Agron. 30, 27–51.
Stengel P 1984 Analyse de la porosité. CR Séminaire CEE Agrimed (14–18/03/83), INRA-Station Science du Sol d’Avignon, 54 p.
Tardieu F and Manichon H 1986a Caractérisation en tant que capteur d’eau de l’enracinement du maïs en parcelle cultivée. I. discussion des critères d’étude. Agronomie 6, 345–354.
Tardieu F and Manichon H 1986B Caractérisation en tant que capteur d’eau de l’enracinement du maïs en parcelle cultivée. II. Une méthode d’étude de la répartition verticale et horizontale des racines. Agronomie 6, 415–425.
Tardieu F and Manichon H 1987a Etat structural, enracinement et alimentation hydrique du maïs. I. Etats structuraux de la couche labourée comme traitements expérimentaux. Agronomie 7, 123–131.
Tardieu F and Manichon H 1987b Etat structural, enracinement et alimentation hydrique du maïs. II. Croissance et disposition spatiale du système racinaire. Agronomie 7, 201–211.
Taylor H M and Gardner H R 1963 Penetration of cotton seedling taproots as influenced by bulk density, moisture content and strength of soil. Soil Sci. 96, 153–156.
Tinker P B 1976 Roots and water. Transport of water to plant roots in soil. Phil. Trans. R. Soc. Lond. B 445–461.
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Tardieu, F. Analysis of the spatial variability of maize root density. Plant Soil 107, 259–266 (1988). https://doi.org/10.1007/BF02370555
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DOI: https://doi.org/10.1007/BF02370555