Project title: Effect of nitrogen timing on irrigated corn grown on sandy
ground
Duration: 1999-2002
Funding: Upper Elkhorn NRD
Contact:
Charles Shapiro Northeast Research and Extension Center, Haskell Agricultural Laboratory, UNL, 57905 866 Road, Concord, NE 68728-2828, (402) 584-2803, cshapiro1@unl.edu
Project
description:
University
of Nebraska nitrogen recommendation was developed on mostly silt loam and silty
clay loams. Since the initial research
significant acreage of irrigated sandy loams have been developed in the north
central region of Nebraska. Over the last 20 years some areas have developed
ground water nitrate levels greater than the maximum contaminate level of 10
ppm. Due to the susceptibility to
leaching and the dependence on irrigation, specific nitrogen management
strategies need to be developed for this fragile land.
Using
the University of Nebraska recommendation procedure as a base, four nitrogen
timing strategies are being tested on both small plots (10 ft x 40 ft) and
large plots (about 15 acres). The four
strategies are:
1. N applied as required by crop
indicators (chlorophyll meter)
2. N applied in several small doses up to
tassel
3. Early season heavy, 2/3 of the N before
V3
4. Mid season heavy, 2/3 of the N after V3
In
addition, an N rate response curve will be established up to 300 lbs N/acre.
All the four treatments are applied at the same total N.
Key
results: To be added later
Publications: To be added later