Growth, water use, and kernel abortion of maize subjected to drought at silking

Evaluatıon of growth and yıeld traıts ın corn under ırrıgatıon regımes ın sub-tropical climate

“…Furthermore, Maize is widely adapted to several of climate change. Maize has been reported to be very sensitive to water scarcity or drought and requires sufficient water thorough out its growing period for better yield (Otegui et al, 2005;English, 2010). Further, it was reported that water stress conditions may cause 22.61-26.4% yield reduction which is directly correlated with the decrease in number and weight of kernel (Pandey et al, 2010).…”

Evaluating Nitrogen Use Efficiency (NUE) Indices on the Background of Mineral Status of the Seed Crop at Maturity: a Case Study of Maize

“…As presented below, the best regression model has been achieved, introducing into the model also the AE N : GY = 0.08 + 0.139PFP FN -0.043AE N for R 2 = 0.99 (9) The predictive dominance of PFP FN has been corroborated by the regression model developed for NKC: NKC = -329.4 + 11.15PFP FN + 0.748PhE N for R 2 = 0.99 (10) These two equations implicitly indicate reduced grain yield and NKC due to insufficient productivity of nitrogen fertilizer. The reason is rooted in the imbalanced nutritional status of maize in stages of NKC performance [29,30]. It has been well documented that water stress during the period extending from the tasselling to the watery stages of kernel growth results in a reduction in NKC [17].…”

“…Any internal and/or external conditions disturbing fertilization of ovules or growth of seed initials leads to its abortion, in turn decreasing the NKC. In rain-fed agriculture, both processes are highly sensitive to water shortages during the critical window [30].…”

“…Therefore, in years with water stress, the difference in unit productivity of nitrogen fertilizer is, as a rule, much lower for biomass compared to grain. It simply means low efficiency of nitrogen remobilization during the grain-filling period due to insufficient capacity of the physiological sink [20,24,30].…”

Desarrollo y evaluación de nuevo germoplasma de maíz (Zea mays L.) para uso especial en Argentina

“…El rendiimiento de las espigas individuales (PGE) muestra una fuerte dependencia del número de granos fijados por espiga, así como del peso individual de los mismos expresado indirectamente mediante el carácter P 1000 que es poco plástico y depende de dos factores concurrentes: la duración del período efectivo de llenado y la tasa de llenado (Andrade et al, 1996). La planta de maíz tiene crecimiento determinado y por ello tiene escasa plasticidad o reducida capacidad para compensar un bajo número de granos causado por el aborto de estructuras reproductivas durante la floración con un mayor peso de los mismos (Andrade, 1995;Andrade et al, 1996), lo cual se revela en los híbridos simples HC ensayados en (Lewontin, 1957) y, en consecuencia, más estables en su comportamiento. Crossa (1990) afirmó que la interacción genotipo x ambiente es relevante en la producción agrícola cuando se manifiestan cambios en el rango de un genotipo a través de los ambientes.…”