Shoot material from several species ( Digitaria, Setaria, Phalaris , ryegrass, maize, and white clover) dried by 4 different methods was analysed for total nitrogen, soluble sugar, and starch concentrations. Recoveries of sugars and starch were best from freeze‐drying; rapid heating (100°C/l h) followed by slow heat‐drying (50°C/23 h), or vacuum‐drying at 40°C were only marginally inferior for the recovery ofstarch and sugars respectively. Substantiallosses ofboth sugars and starch resulted from heat‐drying at 95°C. Total nitrogen recovery was highest in heat‐dried tissue and lowest in freeze‐dried, Tissue of some species held for 4 h under warm conditions, before drying, had significantly different soluble sugar and starch concentrations compared with tissue dried immediately after harvest.
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Haslemore et al. (1980) studied this question.
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