2009 Nutrient Management
Protocol for Ontario Regulation 267/03 Made under the Nutrient Management
Part 10 - Common Land Application Requirements
Table of Contents
- Determination of Percentage of Crop Residue
- Minimum Depth to Groundwater
10.1 Determination of Percentage of Crop Residue
In some circumstances, application of prescribed materials to the
soil without incorporation is allowed where at least 30% of the
soil surface is covered with crop residue at the time of application.
This is provided for in Part VI of the Regulation.
The percentage of crop residue cover can be determined using the
rope transect method. The material required is a light rope (about
8 m in length) with knots or other markings spaced along the rope
at 15 cm intervals so that there are a total of 50 knots. This rope
is laid out across the soil surface, preferably at an angle to the
crop rows, and pulled slightly taut. The number of knots that are
touching pieces of crop residue (minimum dimensions 2 mm by 2.5
cm) is counted. This number, when multiplied by two, is the per
cent crop residue cover. This determination should be made a minimum
of four times in different parts of the field, and the results averaged.
10.2 Minimum Depth to Groundwater
Part VI of the Regulation prohibits the application of non-agricultural
source material to land unless there is at least 30 centimetres
of "unsaturated" soil at the surface of the land.
10.2.1 Procedures for Determining Unsaturated Soil Conditions
"Unsaturated", in relation to soil condition, refers
to a soil water content that is less than 100 per cent of the total
pore space, or is at a negative soil water pressure as determined
using the following procedure:
- dig a hole or remove a soil core to a 30 cm depth,
- observe whether water flows into the hole from the surrounding
soil (this may take up to an hour in clay soils).
Water will only flow under saturated conditions, so if water is
observed, the soil does not meet the applicable criteria for unsaturated