Experimental studies on seed production of tropical grasses in Kenya. 5. The effect of time of nitrogen top dressing on seed crops of Setaria sphacelata cv. Nandi.

Abstract

Effects of date of applying top-dressings of N to early-season and late-season seed crops of Setaria sphacelata cv. Nandi were studied in 4 trials in 1967-71. Highest seed yields were obtained when N was applied as soon as possible after the onset of the rainy season; a delay of 4 weeks reduced yields of pure germinating seed by >60%. Total yields of herbage DM and number of heads were also reduced, but to a lesser extent; the main adverse effect was on seed set/head. In late-season crops, applying N 2 weeks after the earliest possible date proved beneficial in 2 out of 3 years. (Abstract retrieved from CAB Abstracts by CABI’s permission)

Avaliação de pastagem de Capim-Braquiária em degradação e sua recuperação com suprimento de nitrogênio e enxofre.

“…Modelos de desenvolvimento de perfilhos foram detalhadamente examinados por Boornman (1971) e Loch (1985), em oito espécies de gramíneas tropicais, cultivadas sob condições de solo de alta fertilidade. Os estudos mostraram que o máximo perfilhamento ocorre durante a fase inicial do crescimento vegetativo.…”