Proceedings
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1. Plant Density Consequences on Nitrogen Uptake Dynamics of Maize Plants from Vegetative to Reproductive StagesThere are few studies to date that have inte nsively examined the simultaneous effects of differences in plant crowding and fertilizer N availability for different hybrids and locations on N uptake and maize (Zea mays L.) grain yield. The main research objective was to utilize a quantitative framework to bett er understand the physiological mechanisms that govern N dynamics in maize plants at varying plant densi ties and N rates. Two field experiments involving paired near-isogenic hybrids (i.e.... |
2. Biological N Fixation on Soybeans: N Nutrition and Incidence on N BalanceSoybean [Glycine max (L.) Merr.] nitrogen (N) demand is partially met (50-60%) by the biological N fixation (BNF) process. Study of the “N-gap” (plant N demand minus N-BNF) and the partial N balance (fixed N in aboveground biomass minus N removed by seeds) are still unanswered scientific knowledge gaps. Focusing on these two components a review of 60 studies reporting on BNF was conducted in order to study the limits to which BNF can satisfy plant N demand. This... I. Ciampitti |