- B. Shillinglaw, J. McGregor, Southwestern Ontario Agricultural Research
Corporation, Harrow, Ont.
View / Download Final Report [27 KB pdf]
Evaluation Summary (Tech. Transfer Report Summaries)
Associated SWEEP/LSP Research
Completed: October, 1991
nitrogen, split application, no-till, ridge tillage, corn, yields
Trials were carried out on two farms in Huron County to examine the relative
merits of splitting the timing of the application of nitrogen fertilizer
between planting and sidedress applications. Current findings have been
that in southwestern Ontario sidedress applications of nitrogen have a yield
advantage over preplant applications. Thus more nitrogen must be applied
if the total season application is applied on or before the date of planting,
relative to where a large portion of the nitrogen is applied later in the
season, closer to the time of consumption by corn.
The experiments involved applications of 0, 20 and 40% of the seasonal
application of nitrogen at the time of planting, with the remainder of the
nitrogen sidedressed. Trials were carried out in each of a no-till and ridge-till
There was no evidence from these trials to support the practice of splitting
nitrogen applications or for the application of the entire season's nitrogen
at sidedressing. However, in light of this study having been limited to
one year's data collection, further testing may be warranted to more thoroughly
examine the relationship of nitrogen timing and crop nutrition and grain
(From Technology Transfer Report Summaries - A. Hayes, L. Cruickshank,
Split nitrogen application systems on corn were experimented with in
this one year study to examine the effects of 3 proportions of nitrogen
(0, 20 and 40% applied at planting time) on corn yields. The actual amounts
of nitrogen applied to the plots were 160 kg N/ha, of which three rates,
0, 30, 60 kg N/ha were applied in a starter band with 28% N and the remainder
applied at side-dressing conventionally (splits 0/160, 30/130, 60/100).
The objective of the study was to determine the probable optimum quantity
of nitrogen to be applied in advance of the sidedress application in a no-till
and ridge till system. Measurements taken on yield and leaf samples were
analyzed for nitrogen content.
The results of the leaf analysis showed that in a no-till system the
30/130 split nitrogen application had significantly lower ear leaf nitrogen
than the 0/160 and the 60/100 application amounts. In the ridge till system
the 30/130 split nitrogen resulted in the highest levels of ear leaf nitrogen.
There was no effect from either the nitrogen treatments or the timing
of nitrogen application on grain yields in either the no-till or ridge till
systems. No yield advantage or disadvantage showed up from splitting the
Because 1988 was a very dry year, it is likely that moisture was a more
limiting factor in this trial than was nitrogen. Therefore, no conclusion
regarding the benefit from the split application of nitrogen, in no-till
or ridge till, should be drawn from this study. Additional work will be
required to determine if such benefits exist.
SWEEP Report #25 - The Development and Testing
of a Dry Fertilizer Placement Machine
SWEEP Report #35 - Nutrient Distribution and
Stratification Resulting from Conservation Farming
SWEEP Report #51 - Loss of Nitrogen by Microbial
Denitrification, Nitrification, Surface and Tile Runoff: Relation to Tillage
LSP7018 - Nitrogen Research with Corn
Using Conservation Tillage
LSP7020 - Nitrogen Conserving Farm
LSP7017 - Cropping and Soil Management
Effects on the Dynamics of Crop Residue Derived-N on the Coarse Textured
Soils in Southern Ontario
Future Research: ( ) indicates reviewers suggestion for
priority, A - high, C - low.
None required. More work on split applications of nitrogen in corn under
conservation tillage on various soil types is being done.
Thursday, May 19, 2011 02:41:00 PM