Organic Gardening Soil Inoculants – Benefits Of Using A Legume Inoculant

peas
Image by Craig McHarg

By Heather Rhoades

Peas, beans and other legumes are well known to help fix nitrogen into the soil. This not only helps the peas and beans grow but can help other plants later grow in that same spot. What many people don’t know is that a significant amount of nitrogen fixing by peas and beans happens only when a special legume inoculant has been added to the soil.

What is a Garden Soil Inoculant?

Organic gardening soil inoculants are a type of bacteria added to the soil to “seed” the soil. In other words, a small amount of bacteria is added when using pea and bean inoculants so it can multiply and become a large amount of bacteria.

The kind of bacteria used for legume inoculants is Rhizobium leguminosarum, which is a nitrogen fixing bacteria. These bacteria “infect” the legumes growing in the soil and cause the legumes to form the nitrogen fixing nodules that make peas and beans the nitrogen powerhouses they are. Without the Rhizobium leguminosarum bacteria, these nodules do not form and the peas and beans will not be able to produce the nitrogen that helps them grow and also replenishes the nitrogen in the soil.

How to Use Organic Gardening Soil Inoculants

Using pea and bean inoculants is easy and simple. First, purchase your legume inoculant from your local nursery or a reputable online gardening website.

Once you have your garden soil inoculant, plant your peas or beans (or both). When you plant the seed for the legume you are growing, place a good amount of the legume inoculants in the hole with the seed.

You cannot over inoculate, so do not be afraid of adding too much to the hole. The real danger will be that you will add too little garden soil inoculant and the bacteria will not take.

Once you have finished adding your pea and bean inoculants, cover both the seed and the inoculant with soil.

That is all. That is all you have to do to add organic gardening soil inoculants to the soil to help you grow a better pea, bean or other legume crop.

This article was last updated on

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