Abstract
The effects of four methods of mulch application on growth and yields of yam ( Dioscorea rotundata) and cassava ( Manihot esculenta) were studied for an Ultisol at Onne, Port Harcourt, southeastern Nigeria. Treatments consisted of three different methods of applying 12 t ha −1 of dry mulch which were compared with an unmulched control. The three methods were complete surface mulch, row zone mulch and mulch incorporated in the top 10–15-cm layer with the second hoeing. Mulching had a significant effect on soil bulk density under cassava but not under yam. Application of mulch in the row zone and mulch incorporation in the top layer decreased soil bulk density of the 0–10-cm layer by 9 and 4%, respectively, in comparison with the unmulched control. The least infiltration rate, however, was observed for the mulch incorporated treatment due to formation of surface seal. During the dry season, the cumulative water loss from the soil was least for the complete surface mulch treatment. Soil chemical properties were also more favorable for complete surface mulch treatment. Density of feeder roots of cassava was high for the complete surface mulch and mulch incorporated treatments. Feeder root density of yam was lower than that of cassava and mulching had no effect. The highest tuber yield of yam was obtained for surface mulching. Cassava tuber yield, however, was not significantly affected by mulching.
Published Version
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