WSU CAHNRS

CAHNRS and WSU Extension

Wheat and Small Grains

Using conservation tillage in organic systems

Organic production is often thought to be aggressive on the soil, mostly because weed management requires heavy reliance on mechanical tools.

However, soil operations for weed control can be done with equipment that minimizes impact on erosion and compaction.

For pre-plant or post-harvest weed control:

The undercutter-sweep can be used pre-plant and post-harvest.

The rotary harrow is used for pre-plant weed management and seedbed preparation tool. It is useful to break down the clods following a pass with the undercutter.

For in-crop weed control:

A high-residue rotary hoe can be used in crop for control of small seedling crops, up to about 12” height. You will obtain optimal weed control if you use the rotary hoe in a moist soil, with a dry weather forecast.

The inter-row cultivator is a tool used for weed control used in row crops: corn, beans… Using it in small grains would require wider spacings (15” instead of 10”), and a precision guidance system to keep the shanks and shovels out of the crop rows. Timing and soil conditions are also essential when using a cultivator, especially in small seedling crops: used too early, or under dry conditions, soil can be overthrown and bury the crop.

 

Undercutter Sweep Blade

Undercutter Sweep Blade

Soil after undercutter pass

Soil after undercutter pass

 

Rotary harrow - the angle optimizes soil uniformization

Rotary harrow – the angle optimizes soil incorporation

Rotary Hoe for in-crop weed management of small crop seedlings.

Rotary Hoe for in-crop weed management of small crop seedlings.

 

Sensor for precision guidance on inter-row cultivator.

Sensor for precision guidance on inter-row cultivator.

Inter-row cultivator in wheat rows. Note the back center wheel used for guidance assistance.

Inter-row cultivator in wheat rows. Note the back center wheel used for guidance assistance.

Wheat and Small Grains, P.O. Box 646420 Washington State University, Pullman, WA 99164-6420, 509-335-1719, Contact Us
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