Date Available
4-3-2018
Year of Publication
2018
Degree Name
Master of Science (MS)
Document Type
Master's Thesis
College
Agriculture, Food and Environment
Department/School/Program
Plant and Soil Sciences
First Advisor
Dr. Chad D. Lee
Abstract
Modern maize hybrids exhibit higher yields, increased biomass production, stress tolerance and greater nitrogen (N) use efficiency. Increased biomass accumulation can influence nutrient uptake and lead to increased nutrient removal. Hybrids were tested at seeding rates (SR) of 74000 (low) and 148000 (supraoptimal) plants ha-1 and at N rates of 0 (deficient) and 390 (non-limiting) kg N ha-1. Plants were sampled at V7, V14, R3, R5 and R6 and separated into vegetative and reproductive fractions for determination of dry matter and N accumulation. Grain yield was harvested at R6.
The high SR and high N treatment combination resulted in greatest biomass accumulation, crop growth rates, and N accumulation per hectare in both vegetative and grain tissues.
The high SR and high N combination maximized grain yield at 20.6 Mg ha-1, essentially through an increase in kernels ha-1. High SR decreased kernel weight, even with high N. At the higher plant densities resulting from the high SR, however, average utilization of available N was enhanced. The results have implications for improved management practices under high input systems and providing insight to growers who incorporate variable seed and N rates.
Digital Object Identifier (DOI)
https://doi.org/10.13023/ETD.2018.064
Recommended Citation
Santoro, Maria Julia, "CORN GRAIN YIELD COMPONENTS AND NUTRIENT ACCUMULATION IN RESPONSE TO NITROGEN, PLANT DENSITY AND HYBRID" (2018). Theses and Dissertations--Plant and Soil Sciences. 100.
https://uknowledge.uky.edu/pss_etds/100