Tropical Grasslands (1996) Volume 30, 335340
Yield response and profitability of Coastcross 2 Bermudagrass at different rainfall and fertility levels
C.J.G. LE ROUX, J.S. SWART, E. OOSTHUYSEN, C. TRETHEWEY and C. PITTAWAY
Döhne Agricultural Development Institute, Stutterheim, Republic of South Africa
A model to estimate the yield of Coastcross 2, a cynodon hybrid, at Bathurst in the Eastern Cape Province, Republic of South Africa was developed to determine the most profitable fertilisation rates, corresponding yields and margins at a range of rainfall factors and opportunity costs. The model uses nitrogen application rate, soil phosphorus status and rainfall as predictor variables. At current price ratios, the most profitable fertilisation rates are far below those needed for maximum yields. The results indicated a surprisingly high phosphorus fixation rate in the soil.