Nitrogen fixation in latosolic soil under grass

Nitrogen fixation by nonsymbiotic microorganisms in some California soils

“…Fixation rates observed in these experiments were also significantly lower than some values obtained with Kjeldahl determinations. Jaiyebo and Moore (1963) found gains of 56 kg. N per hectare per year under a mulch, and 89.8 kg.…”

“…Efforts to estimate the rate of fixation have been limited because the rate of fixation is low and (or) methods are too insensitive to detect small changes in nitrogen content. The methods used include total nitrogen determinations (Kjeldahl nitrogen) (Jaiyebo and Moore, 1963;Moore, 1963;Moore and Abaelu, 1959;Olsen, 1932;Olson, 1958;Parker, 1957;Stevenson, 1958Stevenson, , 1959, lysimeter determinations (Chapman, Liebig, et al, 1949;Gel'tser, 1961;Smith, 1944), N215 studies (Delwiche and Wijler, 1956;Stewart, 1965), and acetylene-ethylene studies (Hardy, Holsten, et al, 1968;Stewart, Fitzgerald, et al, 1967). Since the Kjeldahl determination is too imprecise to detect small changes, large numbers of samples must be assayed and given statistical analysis.…”

Aplicação de calcário e culturas de cobertura na implantação do sistema plantio direto em cerrado

“…O capim-pé-de-galinha é citado na literatura desde a década de 60, Moore (1963). Esse cereal é originário do continente africano (Uganda), onde seus grãos são utilizados na alimentação humana, na forma de farinhas (Oduori, 1994), e na alimentação animal de aves de corte e suínos, além de ser empregado como forrageira na criação de ruminantes (Mushonga, 1994).…”

Consumption of Atmospheric Nitrogen

“…Prior to 1968, several reports appeared on N2 fixation in the rhizosphere oftropical grasses (Dobereiner, 1961;Jaiyebo and Moore, 1963;Moore, 1963;Parker, 1957). They were not taken seriously until Dobereiner et al (1972) found considerable acetylene-reducing activity in the roots of Paspalum notatum (Bahia grass).…”