See more from this Session: S4-S8 Graduate Student Poster Competition
Monday, October 17, 2011
Henry Gonzalez Convention Center, Hall C, Street Level
By-Plant variability in maize grain yield has been shown to exist, with average differences in yield of 2765 kg ha-1. This study was conducted to determine the effect of fertilizing each maize plant based on Normalized Difference Vegetation Index (NDVI), readings on final grain yield. One experiment was conducted on a Pulaski fine sandy loam (coarse loamy, mixed, superactive, nonacid, Udic Ustifluvent) near Lake Carl Blackwell (LCB), OK and on a Taloka silt loam (fine, mixed, active, thermic Mollic Albaqualf) at Haskell, OK. Pre-plant N rates included were 0, 45, 90, and 180 kg ha-1, with 180 kg ha-1 used as a reference strip. Plant height, distance between plants, and NDVI measurements were collected at the V8 stage. Top-dress N was applied using a variable rate by-plant, the same rate to each plant, and a uniform rate along the entire length of row. A non fertilized check was also included. Results for applying N to each indivicual maize plant based on NDVI readings are at present inconclusive.