Green Manure Mix

Improve disease resistance through better pest control

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Green Manure Mix is designed to supercharge your soil structure by improving soil nitrogen, suppressing weeds, and returning depleted nutrients with a fast growing crop of approximately 6 - 8 weeks before mulching. Can be grazed for extra feed.

Key attributes

  • Improves soil structure and water retention
  • Suppresses weeds
  • Adds nutrients through mulching
  • Nitrogen fixing legume component
  • Breaks cereal root disease cycles
  • Can be grazed for extra feed

Mix components

Formulation 2021

Component
Oats
Oats are good for overcrowding any weeds that may germinate. The fibrous roots are also good at breaking up soil.
Faba beans are excellent for nitrogen fixing and can effectively break the lifecycle of cereal root diseases like take-all, and crown rot. Their shallow root system, combined with a shorter growing season, means that soil moisture at depth is not fully extracted.
Vetch
Valued for benefits to following cereal and oilseed crops in the rotation, usually greater than from other pulses

*Occasionally some varieties in our mix will be replaced with a like-for-like variety where the original is not available or not easily accessible. Varieties in the mix will be specified on the bag label.

About this variety

The Green Manure Mix is an Irwin Hunter blend of oats, faba beans and vetch, grown specifically to be returned to the soil rather than harvested.

Each component contributes something different. The oats produce bulk quickly and out-compete germinating weeds, and their fibrous roots break up the soil. The faba beans fix nitrogen and break the life cycle of cereal root diseases such as take-all and crown rot, and their shallow root system and shorter season mean soil moisture at depth is not fully drawn down. The vetch adds further nitrogen, and its benefit to the cereal and oilseed crops that follow is generally greater than that from other pulses.

Green manure improves soil that has been depleted by previous crops, or prepares ground for a crop that will be nutrient hungry. It also improves structure and water retention, and draws minerals up through the profile where following plants can reach them.

The crop is grown for roughly six weeks before mulching, and it can be grazed first to provide extra feed before it goes back into the ground.

Planting & grazing notes

Can graze to provide extra feed.

Disease & pest resistance

Faba beans can effectively break the lifecycle of cereal root diseases like take-all and crown rot; mix advertised to 'improve disease resistance through better pest control'

How it's sold

FormPackStatus
Bare25 kgIn stock
Green Manure MixGreen Manure Mix

FAQs

My old cropping paddock is run down and the soil is tired. What can I sow to build it back up before next season?

We recommend our Green Manure Mix, a blend of oats, faba beans and vetch grown to be mulched back into the soil. It adds nitrogen, returns nutrients and improves soil structure and water retention. It suits sandy to heavy soils in 350mm+ rainfall areas and grows for roughly 6 to 8 weeks before mulching.

What's a good quick crop to turn in as green manure before planting a hungry vegetable or fodder crop?

Our Green Manure Mix is designed for exactly this. It is a fast-growing crop of about 6 to 8 weeks before mulching, and the faba beans and vetch fix nitrogen while the oats add bulk. Sow at 50 to 75 kg/ha in areas with 350mm+ rainfall, then dig it in to feed the following crop.

How do I break the take-all and crown rot cycle in my wheatbelt cereal paddocks without another cereal?

A legume break helps, and our Green Manure Mix includes faba beans, which can effectively break the lifecycle of cereal root diseases like take-all and crown rot. Vetch in the mix also benefits following cereal and oilseed crops. Keep in mind the oats in the blend are a cereal, so talk to us if a pure legume break is required.

Weeds keep taking over my bare paddock between crops. What can I sow to smother them?

We recommend our Green Manure Mix. The oats are good at overcrowding weeds that germinate, and the dense canopy with faba beans and vetch covers bare soil. Once mulched, the residue continues to protect the surface. It suits sand through to heavy soils with 350mm+ rainfall and tolerates waterlogging.

I've got a paddock that goes wet in winter in the South West. Is there a green manure crop that won't drown?

Our Green Manure Mix is rated tolerant of waterlogging, so it suits paddocks that get wet over winter. It grows on sandy through to heavy soils in 350mm+ rainfall areas. The oats' fibrous roots help open up the soil, and the legumes add nitrogen once the crop is mulched in.

What sowing rate do I use for a green manure crop of oats, beans and vetch?

For our Green Manure Mix we recommend 50 to 75 kg/ha. It needs 350mm+ rainfall and suits sandy to heavy soils. Inoculate the legume components with the correct rhizobia so the faba beans and vetch fix nitrogen, and aim to mulch or dig it in at around 6 to 8 weeks of growth.

Can I graze a green manure crop before I mulch it in, or does that defeat the purpose?

You can. Our Green Manure Mix can be grazed for extra feed before it is mulched back in. Keep grazing light so you still leave plenty of bulk to incorporate, because the biomass is what feeds the soil. The oats, faba beans and vetch give reasonable early feed while building soil nitrogen.

When does Green Manure Mix flower, and when should I turn it in?

Green Manure Mix flowers at roughly July to August. The mix is designed as a fast crop of approximately 6 to 8 weeks before mulching, which is usually when it has good bulk and plenty of green leaf. Incorporating before the plants get fibrous helps the residue break down quicker and release nutrients.

Green Manure Mix vs Cover Crop Plus Winter, what's the difference?

Green Manure Mix is a simple three-species blend of oats, faba beans and vetch, grown quickly and dug back in to feed the soil. Cover Crop Plus Winter is a more diverse multi-species blend aimed at biodiversity, soil cover, grazing and mulching. Choose Green Manure Mix for a fast nutrient boost before a following crop.

Can I use Green Manure Mix in a vegetable garden or small block, not just broadacre?

Yes, Green Manure Mix works on small areas as well as paddocks, because the goal is the same: grow the crop, then dig it back in to improve soil structure and nutrients. It suits sandy to heavy soils and tolerates waterlogging. Rainfall or watering equal to 350mm+ over the growing period is needed.