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Abstract
A pot experiment was conducted in the glasshouse to determine the effect of three heights of cut on translocation of 14C‐labelled assimilates in Eragrostis curvula cv Ermelo.
Autoradiographs revealed that to produce regrowth plants defoliated to a height of 7,5 cm did not draw on their reserves significantly and that both new growth and stubble were able to maintain a continuous supply of assimilates to the roots after defoliation. In contrast, in plants defoliated to 2,5 cm all assimilates were retained in the labelled tiller to sustain new growth. Results from plants defoliated to 5,0 cm revealed the same patterns as for plants defoliated to 7,5 cm, although it was clear that smaller amounts had been translocated.
These results indicate the practical importance of not defoliating E. curvula too low.
Uittreksel
‘n Potproef is in die glashuis uitgevoer om die uitwerking van drie snyhoogtes op translokasie van 14 C‐assimilante in Eragrostis curvula cv Ermelo te bepaal.
Outoradiograwe het getoon dat plante wat tot ‘n hoogte van 7,5 cm gesny is, nie hul reserwes vir hergroei gebruik het nie en dat assimilante na sny deurlopend vanaf beide hergroei en stoppels no wortels verplaas is. In teenstelling hiermee het plante wat tot 2,5 cm gesny is, alle assimilante in die behandelde lote vir hergroei behou. Alhoewel plante wat tot 5,0 cm gesny is, dieselfde patrone van translokasie as plante wat 7,5 cm hoog gesny is, getoon het, is kleiner hoeveelhede verplaas.
Hierdie proef het aangetoon dat E. curvula in die praktyk nie te kort gesny of bewei behoort te word nie.