How different composts affect plant growth after 8 weeks in modules

Qualities of different composts, see how they affect growth on plants in the modules for 8 weeks. These are kale, cabbage and Brussels sprouts grown in my greenhouse in a mild, temperate climate between mid-May and mid-July.

Here we have Moorland Gold peat free, 3 year old sieved woodchip, vermicast from SD Microbes, New Horizon recent purchase, Dalefoot 6 months since purchased, and lastly 10 month old sieved homemade compost.

Filtrated peat is a waste product of Yorkshire Water, after they sieve water to drink, from a peaty catchment area.

The module trays are 40L from Containerwise, made from polypropylene. They are reusable hundreds of times, without washing, see also my CD60 trays for slightly smaller transplants https://containerwise.co.uk/charles-dowding-propagation-trays/

If you have the means to make your own mix, I would try it. The quality of composts sold is highly variable. You might use one with the same name a few months later, and have a totally different experience from using it.

This is not only from the innate quality, but also their age. Many composts are sold too young and they grab nutrients from plants, to finish their own decomposition.

This long-form video explains in detail the values of a range of compost products
https://www.youtube.com/watch?v=jt4azBLuJrc

Filmed at Homeacres SW UK by Nicola Smith, 12th July 2022.

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