In a pot experiment with the A1 (topsoil) and B2 (subsoil) horizons of a Clovelly soil, it was found that although increasing the rate of band?placed lime from 265 to 2650 kg per ha did not significantly influence the yield of Ladino clover, considerably higher yields were obtained where the pH of the entire soil mass was raised from approximately pH 5.0 to 6.0 by liming. It is suggested that Al?toxicity is a major limiting factor in this soil and may largely account for the response to liming. Increasing the band?placed superphosphate application from 265 to 2650 kg per ha resulted in highly significant yield increases. Considerable root development occurred in the superphosphate bands as compared with limited root development in the lime bands. Significantly higher yields were obtained from the A1 horizon than from the B2 horizon. Differences due to depth of placement of the lime and superphosphate, placement of the lime and superphosphate in a single band as opposed to separate parallel bands, and the use of powdered and granular superphosphate were recorded in the first cut but not in the second.
Journal articles from the Grassland Society of Southern Africa (GSSA) African Journal of Range and Forage Science as well as related articles and reports from throughout the southern African region.