Effect of superphosphate application on dry matter yield, botanical and chemical composition of native/stylo mixed pastures and on the performance of grazing carabulls
Salces, C.B.
Two trials were conducted at Ubay Stock Farm, Bohol [Philippines] from June 1989 to June 1990 to evaluate the effect of topdressed superphosphate application on the productivity of native/stylo mixed pastures grown in Ubay clay series soil. In trial 1, the effect of 4 levels of phosphorus (P) application (0, 30, 60, 90 kg P/ha) on yield, botanical and chemical composition of mixed pasture was evaluated. Total dry matter yield (DMY) was significantly (P0.01) increased with increasing P rates. This was largely attributed to the increase (P0.05). Analysis of 30-day regrowth showed that nutrient content of the individual species did not vary significantly with P levels. However, the increase in stylo composition with increasing P rates improved the nutrient quality of the mixed pastures; there being linear increase in CP values (P0.01) during the wet season and P values (P0.05) during the dry season as well as reduction (P0.05) of total cell wall (NDF) during the wet season. In trial 2, Murrah grades (G1-native, G2-25%, G3-50% upgrade) stocked at 1 a.u. per hectare were randomly allotted following a split-plot in RCBD with P rate (P1
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