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AGROPYRON REPENS (L.) BEAUV.—SOME EFFECTS OF RHIZOME FRAGMENTATION, RHIZOME BURIAL AND DEFOLIATION |
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| Authors: | D J TURNER |
| Institution: | Agricultural Research Council Weed Research Organization, Begbroke Hill, Kidlington, Oxford, England |
| Abstract: | Summary. A factorial experiment with couch grass ( Agropyron repens (L.) Beauv.) grown in boxes examined the effects of rhizome fragmentation, planting depth and shoot removal on the survival of rhizome pieces, new rhizome growth and rhizome carbohydrate reserves. Burial to 4 in. depth in sandy loam soil led to the death of 54% of 1 in. long rhizome pieces and 28% of 3 in. pieces. With all the segment lengths tested deeper planting decreased the proportion of buds which produced shoots. Shoot removal every 14 days decreased the dry weight and carbohydrate content of the planted rhizomes and prevented new rhizome growth. Segments 1 or 3 in. long lost their carbohydrate reserves more quickly than 9 in. pieces. Rhizomes planted at 4 in. depth contained less carbohydrate after establishment than shallow-planted material, and produced less new rhizome growth. IS Agropyron repens (L.) Beauv.–Quelques effets de la fragmentation et de l'enfouissement du rhizome et de la defoliation |
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