Abstract
Pearl millet [pennisetum typhoides (Burm.) Staph and Hubbard] was grown under high K Ca fertilized and low K and Ca unfertilized; and sudangrass [Sorghum sudanense (Piper) Staph] under high K and Ca. The forages were fed to dairy cows to determine their milk fat-depressing effect, and analyzed for nitrate N, Ca, P, Mg, K, and organic acids, Pearl millet caused milk fat depression, but sudangrass did not, Pearl millet contained higher percentages of nitrate N and Ca than sudangrass in 1966 but not in 1967. Phosphorus was not significantly affected either year by the treatments. Unfertilized pearl millet contained more Mg than the two other treaments. Pearl millet on fetilized plots contained more K Than pearl millet unfertilized or sudangrass. Pearl millet had a higher total organic acidity than did sudangrass. High concentrations of oxalate and succinate were found in pearl millet. Pearl millet grown under high K and Ca had more succinate, malate, and oxalate than without K and Ca fetilization. Succinate tended to vary inversely with milk fat levels. oxalic acid was very high early in the season, then steadily decreased. Oxalate varied directly with forage K levels. Milk fat rose when soil moisture increased, whereas oxalate and succinate decreased during the same period.
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