Variability in water and nitrogen availability at plot scale and its effect on Maize (Zea Mays L.) production

p.21-30

Caracterización de una variedad local de maíz (Zea Mays L.) de la Provincia de Río Negro

p.139-144

Variability in water and nitrogen availability at plot scale and its effect on Maize (Zea Mays L.) production

p.21-30

Arsenate, arsenite and dimethyl arsinic acid (DMA) uptake and tolerance in maize (Zea mays L.)

The influx of arsenate, arsenite and dimethyl arsinic acid (DMA) were studied in 7-day-old excised maize roots (Zea mays L.), and then related to arsenate, arsenite and DMA toxicity. Arsenate, arsenite and DMA influx was all found concentration dependent with significant genotypic differences for arsenite and DMA. Arsenate influx in phosphate starved plants best fitted the four-parameter Michaelis-Menten model corresponding to an additive high and low affinity uptake system, while the uptake of phosphate replete plants followed the two parameter model of Michaelis-Menten kinetics. Arsenite influx was well described by the two parameter model of 'Michaelis-Menten' kinetics. DMA influx was comprised of linear phase and a hyperbolic phase. DMA influx was much lower than that for arsenite and arsenate. Arsenate and DMA influx decreased when phosphate was given as a pre-treatment as opposed to phosphate starved plants. The +P treatment tended to decrease influx by 50% for arsenate while this figure was 90% for DMA. Arsenite influx increasing slightly at higher arsenite concentrations in P starved plants but at lower arsenite concentrations, there was little or no difference in arsenite uptake. Low toxicity was found for DMA on maize compared with arsenate and arsenite and the relative toxicity of arsenic species was As(V) > As(III) >> DMA. © 2008 Springer Science+Business Media B.V.

Avaliação do aproveitamento da palha do milho (Zea mays L.) para bioenergia, nos sistemas de produção do Vale do Tejo

Dissertação de mestrado em Agricultura Sustentável, apresentada na Escola Superior Agrária de Santarém, Instituto Politécnico de Santarém.

Microclima de componentes del rendimiento de frijol (Phaseolus vulgaris L.) en siembras intercaladas con maíz (Zea mays L.).

Tesis (Maestría en Ciencias, Especialista en Producción Agrícola) UANL

Efecto de Profit-G, gallinaza y estiércol bovino sobre la actividad fotosintética y el rendimiento de maíz (Zea mays L.) en el Distrito de Riego No. 26 del Bajo Río San Juan

Tesis (Maestría en Ciencias con Especialidad en Producción Agrícola) UANL

Respuesta de tres genotipos de maíz (Zea Mays L.) al desespigamiento y densidad de población

Tesis (Maestría en Ciencias Especialidad en producción Agrícola) UANL

Respuesta a la aplicación de nitrogeno, potasio y azufre en dos densidades de siembra en maíz (Zea mays L.) en suelos calcáreos del norte de Tamaulipas.

Tesis (Maestría en Ciencias Especialidad en Producción Agrícola) UANL