Infosheet 19 - Field Crop Management
Table of Contents
- Introduction
- Crop Rotations
- Residue Crop Management
- Conservation Cropping
- Pasture Management
- Weed Management
Introduction
This infosheet provides background to Worksheet #19 of the Environmental
Farm Plan Workbook. It outlines options you could adopt to address
problem areas in your operation. In most cases you'll need more information
before implementation: please refer to the resource materials listed in
the infosheet, and consult OMAFRA Environmental Farm Plan (EFP) Technical
Advisors.
All options are classed as Actions or Compensating Factors. Actions address
the areas of concern identified, and will change the EFP rating to (3)
or Best (4). Compensating Factors are alternatives that will adequately
address the concerns, but will not change the rating in the EFP worksheets.
At the request of the Ontario Farm Environmental Coalition, consisting
of Ontario Federation of Agriculture, Christian Farmers Federation of
Ontario, AGCare, and the Ontario Farm Animal Council, the following people
contributed to the development of Infosheet #19:
Neil Moore, OMAFRA (Chair)
Rob Templeman, OMAFRA
Gilles Quesnel, OMAFRA
Bill Curnoe, Kemptville College
Tony Vyn, University of Guelph
Technical Editing Committee:
Brent Kennedy, OMAFRA
Jim Myslik, OMAFRA
Bob Stone, OMAFRA
The following people contributed to the revision (2004) of Infosheet
#19:
Gilles Quesnel, OMAFRA (Chair)
Brian Hall, OMAFRA
Neil Moore, East Central and Quinte Soil & Crop Improvement
Rita Vogel, OSCIA, EFP Program Representative
Frank Hoftzer, AGCare
Technical Editing Committee:
H.J.Smith, OMAFRA
Jim Myslik, OMAFRA
Bob Stone, OMAFRA
OMAFRA = Ontario Ministry of Agriculture, Food and Rural Affairs
Crop Rotations
Issue: 19-1 Rotation for soil protection (coverage for all fields)
Exposed soil is at high risk of erosion, especially over winter. The
best defence is to provide soil surface cover for as long as possible.
What can you do?
Option #1 – Action
Plant more perennial crops (grasses and legumes):
- increase the amount of land in perennial forages including pastures
– the land is covered for a longer time and therefore protected
- especially important for high risk situations such as steep slopes
or highly erodible soils
- perennial or over-wintering cover crops should be grown at least
two years out of five
- if not fed on farm, a market for the perennial forage will be required
in order for this to be an acceptable option.
Option #2 – Action
Plant overwintering cover crops:
- select cover crops that won't interfere with next year's crop growth
- time planting to allow sufficient growth, but late enough so that
the cover crop does not go to seed
- perennial or over-wintering cover crops should be grown at least
two years out of five
- manage cover crops to use existing equipment as much as possible.
Option #3 – Action
Plant winter cereals:
- winter cereals (e.g., winter wheat) can offer excellent soil protection,
provided they are planted early enough to allow time for sufficient
ground cover establishment.
Option #4 – Compensating Factor
Use residue management systems (no-till, reduce till):
- aim to leave at least 20% crop residue on the soil surface after planting.
For More Information:
- Agronomy Guide For Field Crops, OMAFRA Publication 811
- Best Management Practices Books: Field Crop Production, Order No.
BMP 02, pp. 22-30;
Soil Management,
Order No. BMP 06, pp. 55-56
Issue: 19-2 Rotation for soil building
Some crops return more organic matter to soil than others. Soil-building
crops include perennial forages and crops that produce good root systems
and are harvested only for their seed.
What can you do?
Option #1 – Action
Include soil-building crops in your rotation (on at least 50% of land
base):
- rotate with soil-building crops, e.g., winter cereals and perennial
forages – likewise, grain corn and spring cereals with the straw/stover
spread will help build soil
- rotate soil-building crops in conjunction with soil-depleting ones
to maintain soil structure and organic matter.
Option #2 – Compensating Factor
Return organic matter to the soil:
- if organic matter is not replaced by adding crop residues or manure,
the soil's fertility and structure will decline
- organic matter can be returned by leaving residue in the field, adding
manure or growing green manure such as red clover, buckwheat, etc.
Option #3 – Compensating Factor
Use reduced tillage system including no-till, reduced till and ridge
tillage:
- these practices result in slower breakdown of crop residue
- adding organic matter will still be important.
For More Information:
- Agronomy Guide For Field Crops, OMAFRA Publication 811
- Organic Farming in Ontario, OMAFRA Factsheet Order No. 98-029
- Best Management Practices Books: Field Crop Production, Order No.
BMP 02, pp. 25-27;
Soil Management,
Order No. BMP 06
Issue: 19-3 Rotation for pest management (weeds, diseases, insects)
Pests are reduced when their host crop is not present in the field. Weed
vigour can be reduced by rotations with more competitive crops. Weeds
are easier to control in fields with crop species differing from the weed
type (grass vs. broadleaf).
What can you do?
Option #1 – Action
Rotate the crop species planted:
- for every four times the field is planted, select different crop
types at least three of the times, e.g., corn, beans, small grains,
forages
- adopt a crop rotation that reduces the chance that the same crop species
will be planted twice consecutively.
Option #2 – Compensating Factor for Perennial Forages
Change the crop environment to keep weeds, insects and diseases in check:
- timely harvest, clipping, pest monitoring.
For More Information:
- Best Management Practices Book: Field Crop Production, Order No. BMP
02, pp. 32-34
Residue Crop Management
Issue: 19-4 Planting and tillage equipment
Residue acts as a blanket and must be spread evenly to prevent problems
during seeding. At least 20% residue cover is required for a conservation
tillage program.
What can you do?
Option #1 – Action
Modify equipment to handle increased residue levels:
- existing planters and drills can handle 20-30% residue levels with
very little modification
- examine the equipment's ability to allow residue to flow through tillage
discs/tines, seed/fertilizer openers or implement frame and wheels,
and improve the spacing where required.
Option #2 – Action
Purchase new equipment that can handle residue situations:
- when buying replacement equipment, consider its ability to handle
20% or higher residue levels.
Option #3 – Compensating Factor
Reduce the number of times the field is worked prior to planting:
- with each tillage pass, more crop residue is incorporated into the
soil, leaving more of the surface exposed to erosive forces
- reducing the number of passes leaves more of a protective surface
residue cover.
Option #4 – Compensating Factor
Change to a rotation that protects the soil:
- perennial or winter cover crops are grown two out of five years.
For More Information:
- Best Management Practices Books: Field Crop Production, Order No.
BMP 02, pp. 42-110;
Soil Management,
Order No. BMP 06, pp. 55-56
Issue: 19-5 Residue management at harvest
Harvesting is the first step in a crop residue management system. Harvesting
equipment should be adjusted to leave a uniform layer of residue cover.
What can you do?
Option #1 – Action
Spread straw evenly at harvest time:
- ensure that the harvest operations spread the straw and chaff uniformly
across the full width of the combine header
- factory or after-market straw and chaff spreader options are available
for most combines.
Option #2 – Action
Remove residue from windrow:
- in the event that the residue is not spread it should be baled off
- a rotation that builds the soil organic matter should be practised
in this situation.
Option #3 – Compensating Factor
Change to a crop rotation that protects the soil:
- perennial or winter cover crops are grown two out of five years.
For More Information:
- Best Management Practices Books: Field Crop Production, Order No.
BMP 02, page 18;
Soil Management,
Order No. BMP 06
Conservation Cropping
Issue: 19-6 Soil surface disturbance during no-till planting and/or
fertilizer application
In a no-till system, planting and fertilizer application are the only
operations which disturb the soil. Minimizing the band width of original
soil surface physically worked up by the soil openers reduces water/wind
erosion, moisture loss, weed seed germination and fuel consumption.
What can you do?
Option – Action
Modify equipment to minimize the band width of original soil surface
physically worked up by the soil openers to reduce the soil and residue
disturbance:
- use ripple or narrow-fluted coulters which do a better job of cutting
through the trash, and generally do not throw as much soil out of the
seed slot than the wider versions
- offset the tillage coulters to set them closer together
- use a single disk opener with a narrow angle of soil opening
- use narrow shank hoe opener
- use a straight blade coulter of sufficient diameter to cut residue
in front of the fertilizer applicator knife
Issue: 19-7 Cropping on long sloping fields
Water erosion can be reduced by alternating less erosion-prone crops
with more erosion-prone ones in strips across the slope, or on contour.
Up-and-down slope systems increase erosion. Cross-slope systems allow
water to move downslope safely with minimal erosion.
What can you do?
Option #1 – Action
Change cropping practice to a strip cropping system:
- cropping can be modified by alternating strips of a row crop with
a cereal crop or forage
- alternate forage crop with row crops to reduce the length of the
slope of more erosion-prone row cropland
- strip width depends on multiple widths of your equipment.
Option #2 – Action
Change cropping practices to a contour cropping and tillage system:
- on slopes (1-8%), contour farming provides good erosion protection
- tillage and planting across the natural slope creates a series of
minidams that hold back water until it can soak into the ground
- point rows can be a problem
- examine the use of the less erosion-prone crops.
Option #3 – Action
Change cropping practice to contour strip cropping:
- contour cropping can be modified by alternating strips of a row crop
with a cereal crop or forage – this practice combines the soil
and moisture savings of contouring with the soil-building advantages
of a crop rotation
- alternate forage crop with row crops to reduce the length of the
slope of the more erosion-prone row cropland
- strip width depends on multiple widths of your equipment.
Option #4 – Compensating Factor
Select less erosive crops:
- limit the field rotation to those crops that provide sufficient surface
coverage to reduce the potential for erosion over the growing season
- the trend would be towards narrow-spaced crops.
Option #5 – Compensating Factor
Change to a reduced or no-till cropping system:
- aim to leave at least 20% crop residue on the soil surface after
planting.
For More Information:
- Ontario Soil Survey Reports (listing of soil erodibility for crops)
- Best Management Practices Books: Field Crop Production, Order No.
BMP 02, pp. 112-113;
Soil Management,
Order No. BMP 06
Pasture Management
Issue: 19-8 Pasture grazing
Pasture is a very important crop. Forage plants that have been grazed
too close are weakened and may die, leaving bare areas that are more susceptible
to erosion.
What can you do?
Option #1 – Action
Establish a well-managed or rotational grazing system, especially for
highly erodible areas:
- rotational grazing allows the forage time to re-grow
- a minimum forage height of 2 inches should be maintained
- no visible bare spots – reseed as necessary.
Option #2 – Compensating Factor
Reduce field grazing pressure:
- clipping as necessary to reduce selective grazing
- to prevent overgrazing, supplemental feed may be supplied
- reduce the number of animals per acre, to a level the pasture can
support.
For More Information:
- Pasture Production, OMAFRA Publication 19
Weed Management
Issue: 19-9 Seed used
Crop seed supplies are a potential source of weed seeds. Certified and
Canada #1 seed have standards to reduce the number of weed seeds in the
crop. The Seeds Act and Regulations outline the specifications
for inspected seed sources and pedigreed seed sample; the Weed Control
Act (R.S.O. 1990, Chapter W.5) outlines the requirements to control
23 noxious weeds. Both may have a role to play.
What can you do?
Option – Action
Reduce the opportunity for weed seed to come onto the farm:
- use weed-free seeds and transplants to reduce the potential concerns
regarding weed control
- use certified seed wherever possible
- otherwise, use seed that has been tested and cleaned to Canada #1
standard - unless the use of the seed is not legal because seed use
is restricted by a technology use agreement or other legal restriction.
For More Information:
- Weed Control Act, R.S.O. 1990, Chapter W.5
- Seeds Act
