Dry matter and crude protein yields of Echinochloa pyramidalis on coastal clay soil of Guyana.
In field trials at Liliendaal, Guyana in June 1988-May 1989 and in June 1989-May 1990, established E. pyramidalis swards given no fertilizer or 84 kg N + 84 kg P2O5/ha were cut every 3, 4 or 5 weeks to a height of 7.6 or 12.7 cm. Total DM yields were 22.70, 27.55 and 27.07 t/ha with 3-, 4- and 5-week cutting intervals, resp., in 1988/89, with corresponding 1989/90 yields of 16.36, 21.78 and 24.03 t. CP yields were greatest with 3-week cutting intervals in both years. Fertilizer and cutting height had little effect on CP yields, although CP values were consistently slightly greater with cutting to 7.6 than to 12.7 cm. DM yields in 1988/89 were greater with cutting to 12.7 cm but were similar at both cutting heights in 1989/90.