Inter-plant competition for resources in maize crops grown under contrasting nitrogen supply and den
By M. Rossini, G. Maddonni, M. E. Otegui. 2011
151 citations recorded by the source corpus.
Abstract Increased plant population density in irrigated and fertilized maize crops enhances plant-to-plant variability since early vegetative stages, because the most suppressed individuals of the stand intercept less radiation per unit leaf area than the dominant ones (i.e. a size-asymmetric competition for light). Contrarily, a size-symmetric competition has been proposed for the acquisition of soil resources in a plant community (e.g. N capture per unit root length is similar among plants of different size). Hence, N fertilization effect on the variability of maize plants would depend on the initial plant-to-plant variability or on that promoted by a high plant population density. Two maize hybrids with contrasting tolerance to crowding (tolerant AX820 and intolerant AX877) were cultivated under different combinations of stand densities (6, 9 and 12 plants m−2) and N supplies (0 and 200 kg N ha−1) without water restrictions. Variability in plant growth rate among plants was computed along the cycle, especially after fertilizer was applied (i.e. the early reproductive period; PGRER) and during the critical period around silking (PGRCP). Plant-to-plant variability in biomass partitioning to the ear (partition index; PI), ear growth rate during the critical period (EGRCP) and kernel number per plant (KNP) was also established. Reduced N supply increased the coefficient of variation (CV) of PGRER, PGRCP, EGRCP and KNP (0.05
Subfields: Agronomy and Crop Science, Plant Science
View Paper: https://www.semanticscholar.org/paper/48d20ce6b1b5b2c62515416641387a31f15ab0e3
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Citations in the corpus
- Survey of Plant Density Tolerance in U.S. Maize Germplasm (2014, background): “Typically as plant density increases, plant growth rate during reproductive stages may become reduced (Echarte et al., 2000; Gambin et al., 2006; Rossini et al., 2011), leading to delayed pollen shed and silking (Tokatlidis and Koutroubas, 2004).”