In terms of the weight of grain used in growing mushrooms, it's crucial to comprehend that maintaining the right balance between the mass of grain and added water is critical for producing high quality spawn. When you ask, 'How much weight is a grain,' remember that moisture level plays an essential role in this context. Even though each cultivator would want to adjust their water to grain ratio according to their needs, it's vital to keep an eye on your grain absorption rate. When working with rye grain tek or any other grain spawn tek for that matter, the ideal moisture content falls within 45-55%, ideally around 50%. This means more than just counting kernels; understanding your grains' dry and wet weights can make a significant difference in your success rate.