Use of phosphate rock in combination with organic amendments to increase pasture production on Nam Phong soil series
1992
Puntipa Vichiensanth (Khon Kaen Univ., Khon Kaen (Thailand). Faculty of Agriculture. Dept. of Soil Science)
In a glasshouse experiment, Ruzi grass (Brachiaria ruziziensis) and Graham Stylo legume (Stylosanthes guianensis cv. Graham) were grown for 18 months on a Nam Phong soil with the addition of two rates of phosphate rock (352 and 704 kg/rai) in combination with organic amendments (rice husk, cattle dung, and Pigeon pea leaves). The addition of phosphate rock alone or in combination with organic amendments could not increase yields of Ruzi grass. (Cold yield response of Ruzi grass was obtained with the addition of triple superphosphate (TSP). In contrast, the production of Graham Stylo legume was significantly in creased by the addition of phosphate rock in combination with organic amendments. Graham Stylo legume also responded to the use of phosphate rock alone although the responses were not statistically significant. Responses of Graham Stylo legume to phosphate rock were slightly inferior to responses to TSP. It was found that Graham Stylo legume responded well to phosphate fertilizers whereas Ruzi grass responded better to organic amendments than to phosphate fertilizers.
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