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Abstract: Regression analysis showed highly significant relationships between nitrogen content of synthetic composts and crop yield. In these investigations the nitrogen in dry matter ranged from 1.74-3.26 per cent and the yield varied between 1.25-3.08 lb per sq ft. Over a narrower range of values for natural compost no statistically significant relationship was obtained between nitrogen content and mushroom yield. Highly significant relationships were also obtained between nitrogen and ammonia, nitrogen and pH and pH and ammonia values. Over relatively wide ranges of values for synthetic compost, ammonia and pH were not found to affect mushroom yields at a high level of significance. The analytical data from natural compost gave a significant relationship between ammonia and crop yield.
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