Nitrates in Annual Forages as Influenced by Frequency and Height of Clipping
1966
Nitrate-N content of plants where Gahi millet, Tift sudangrass, and sudax 11 were fertilized with a total of 670 pounds of N as NH₄NO₃ and harvest frequencies of 2-, 3-, 4-, and 5-weeks were combined with portions of forage removals of ⅓, ½, ¾ and ⅞ show: Tift sudangrass and sudax were consistently lower in nitrate-N than Gahi millet. Forage harvested at 2- or 3-week frequencies was higher in nitrate-N than forage harvested every 4 weeks, and forage harvested at 5 weeks was lowest. Nitrate-N was highest when ⅞ of the forage was removed and lowest when ⅓ of the forage was harvested. Nitrate-N in Gahi millet, sudangrass and sorghum-sudan crosses would appear to be nontoxic to livestock grazing the forage when normal rate of N are applied in split applications.
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