Abstract
The winter forage crops rye (Secale cereale) and ryegrass (Lolium multiflorum) were grown on Lakeland fine sand under irrigation with secondary municipal effluent. Irrigation rates from l in./week-4 in./week (25 mm/week-l00 mm/week) were used. Three cuttings of forage were obtained over a 2l-week growing period. Dry matter yields increased with irrigation rate, while dry matter percentage showed a decrease. Nutrient uptake generally increased with application rate, while recovery efficiency of all elements measured decreased. Recoveries of 67% and 50% of applied N occurred at l05 lb/acre (ll8 kg/ha) and 2l5 lb/acre (240kg/ha) for rye, and at 195 lb/acre (2l8 kg/ha) and 310 lb/acre (347 kg/ha) for ryegrass. The effluent was deficient in K relative to other nutrients. An irrigation rate of l in./week (25 mm/week) to 2 in./week (50 mm/week) appears suitable for production of rye or ryegrass with effluent on well-drained sandy soils.
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