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Maize yield per unit area has dramatically increased over time as have plant population densities, but the genetic basis for plant response to density is unknown as is its stability over environments. To elucidate the genetic basis of plant response to density in maize, we mapped QTL for plant density-related traits in a population of 186 recombinant inbred(More)
A 3-year case study was undertaken of how North American farmers use yield monitors for on-farm trials in farm management decision making. Case study methods were used because relatively few farmers quantitatively analyze yield monitor data. At this early research stage, insufficient farm management information about the data was available to ask the right(More)
Global food security must address the dual challenges of closing yield gaps (i.e., actual vs. potential yield) while improving environmental sustainability. Nutrient balance is essential for achieving global food security. Historical (in distinct " Eras " from late 1800s to 2012) and geographical (in United States vs. remainder of World) changes in maize(More)
Characterization of the pre-and post-silking period differences in dry matter (DM) accumulation and nitrogen (N) uptake and partitioning between older and newer maize (Zea mays L.) hybrids is useful in the context of providing possible mechanisms of yield and N efficiency gains over the decades of genetic improvement. However, there is substantial(More)
RESEARCH T he three-way interaction of genotypes, environment, and management practices (genotype [G] × environment [E] × management practice [M]) (Messina et al., 2009) is highlighted in the diverse tolerances and yield responses of modern maize genotypes to specifi c abiotic and biotic stresses under varying management practices and environments. During(More)
We conducted a synthesis analysis on data from 86 published field experiments conducted from 1903 to 2014 to explore the specific consequences of post-silking N accumulation (PostN) in New Era vs. Old Era hybrids on grain yield (GY) and recovery from plant N stress at flowering (R1 stage). The Old Era encompassed studies using genotypes released before, and(More)
Growers and applicators should carefully apply all fertilizer materials not just to maximize plant nutrient uptake and crop yield, but also to reduce nutrient losses to the environment. Phosphorus (P) fertilizers pose particularly complex and acute environmental risks. Generally, P is immobile in the soil, but under some conditions P can leave the field and(More)
Reduction of greenhouse gas (GHG) emissions from upland crop field as well as paddy field is being required, but little information on GHG emissions according to cultivation practices in upland field is available. Soil GHG emissions during the growing season were investigated in the field of three decades rotation and tillage treatments which were consisted(More)
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