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Determining the amount of compost can be difficult because there are so many different methods of composting. There are also differences depending on the crop. For example, Chinese cabbage requires a lot of compost, but tomatoes grow well with about 1/3 of the compost given to Chinese cabbage.
Excessive use of compost can cause over growth in crops. To prevent this from happening, you can use about 75% sawdust when composting. Even if you use a lot that contains a lot of sawdust, over growth does not occur easily.