Extractable protein from ‘Grasslands Tama’ Westerwolds ryegrass

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Abstract
Yields of extractable protein from ‘Grasslands Tama’ Westerwolds ryegrass were measured for the period May to late October or mid November in two experiments. In one experiment rates of nitrogenous fertiliser from zero to 168 kg N ha−1 were applied once m May, and the crop was cut at 3-, 6-. or 12-week intervals from that time. The highest yield of extractable protein (945 kg ha−1) was obtained from the treatment involving 6-weekly cutting with a single application of 168 kg N ha−1. Highest yield of herbage dry matter (10 380 kg ha−1) was obtained from the 12-weekly cutting treatment. In another experiment in which the crop was cut at 4-wcekly intervals, either 30 or 60 kg N ha−1 was applied after each of six cuts, or 180kgN ha−1 was applied once at the beginning of the experiment. With the same amount of N in split or single application, yields of extractable protein were Similar (1040 kg ha−1). They were higher (1210 kg ha−1) with the highest amount of N. No response to N was evident until the August harvest. Highest yield of herbage dry matter was 8720 kg ha−1. Satisfactory separation of steam-precipitated protein curd from whey may be difficult with mature tissue.

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