The Comparative Response by Five Tropical Grasses to Fertilizer Nitrogen

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  • 施肥窒素に対する数種暖地型イネ科草の感応特性
  • セヒ チッソ ニ タイスル スウシュ ダンチガタ イネカ ソウ ノ カンノウ

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Abstract

The effects of eleven rates of fertilizer nitrogen (0-20kg/10a) on dry matter yields, nitrogen yields, nitrogen contents and nitrogen recovery rates of the plant tops were compared for five tropical grasses ; Eleusine corocana (African millet), Chloris gayana cv. Pioneer (Rhodes grass), Paspalum dilatatum cv. Nampuu (dallis grass), Panicum maximum cv. Gatton (Guinea grass) and Panicum maximum var. trichoglume cv. Petrie (green panic). Results: According to the patterns of their response to fertilizer nitrogen, grasses subjected to this experiment were divided into three groupes of grass as follows ; Groupe I African millet and Guinea grass, Groupe II Rhodes grass, and Groupe III dallis grass and green panic. Groupe I significantly increased dry matter yield even at lower rates of nitrogen application while groupe II gradually increased with increasing rates up to 20kg nitrogen per 10a. Groupe III has shown relatively lower increase in dry matter yield at lower rates of nitrogen application and drastical drop at higher rates of nitrogen application showing somewhat intermediate pattern between nitrogen responses of groupe I and II. Based on the above patterns of each group of tropical grass, the following methods of applicating nitrogen fertilizer will be suggested: Groupe I should avoid either light or heavy nitrogen application ; groupe II always requires heavy nitrogen application ; and groupe III should avoid excessively heavy nitrogen application.

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