How to pasteurise these straw pellets for mushroom growing?

From what I know and my experience growing with this substrate is that the process from which they turn the straw into straw pellets already pasteurizes them. So, you would only need to rehydrate the pellets then add the mushroom spawn. That's what I did for my king oyster mushrooms and they turned out fine.

What is the pellet to water ratio when pasteurizing for substrate?

On the website for this it says For 5lb of substrate 5cups (2lb) of pellets Add 1.4liters (3lb) of water So basically every 2lb of pellets your water ratio will be one lb higher then the pellets so if you wanted to make a 10 lb substrate it would be 4lb of pellets and and 6lb of water 3 for the first 2lb and 3 for the other 2lb I’ve been told when pressure cooking or sterilizing it can be 2.5hrs for 10lb or 3hrs after that time needs to be added or changed

Will this work for growing portobello mushrooms from liquid culture?

Doubt it. It is a substrate, not a grain spawn medium. check with your spore provider, though.

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Wheat Straw Pellets - Great for Gourmet Mushroom Growing Substrate, High Absorption; 10 Pounds

Wheat Straw Pellets - Great for Gourmet Mushroom Growing Substrate, High Absorption; 10 Pounds

Product ID: 585106846

🌾100% natural wheat straw base

🍄perfect substrate for gourmet mushrooms

💧high moisture absorption for optimal growth

Description

🍄 Grow Gourmet Greatness with Every Pellet!

BULK 10 POUND PACK - Generous quantity designed for serious growers and professionals aiming for consistent yields.
EASY TO USE PELLETS - Compact pellets simplify preparation and reduce mess—just hydrate and grow.
PREMIUM NATURAL BASE - Crafted from 100% wheat straw for eco-friendly, sustainable mushroom cultivation.
VERSATILE GOURMET GROWTH - Ideal substrate for a wide variety of gourmet mushroom species, unlocking culinary creativity.
SUPERIOR MOISTURE RETENTION - Exceptional absorption ensures your mushrooms get the hydration they need to thrive.

Wheat Straw Pellets by MushroomMediaOnline offer a premium, eco-friendly substrate solution designed specifically for gourmet mushroom cultivation. With excellent moisture absorption and rehydration properties, these 10-pound pellets provide a reliable, easy-to-use base that supports robust mushroom growth and high yields.

Specifications

Manufacturer	MushroomMediaOnline
Package Dimensions	44.2 x 30.48 x 6.6 cm; 4.54 kg
ASIN	B08J8D5QNT

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