My daughter is just finishing her science fair project. She has four worm bins which she fed different types of food (fruit, veggie, egg/coffee, and grass/leaves) for the last three months. The hypothesis was that the bins would produce different levels of nutrients that would then could be best used for optimal production of different plants or at different times of plant development. Well the day arrived to test all the soils on Sunday. She had to wait an extra day just to let the soil settle in some of the water, but she completed all the tests last night. Our surprise (and she re-did each test) all of the bins came up Nitrogen deficient??? They had varying degrees of Potash and Phosphorus and varying levels of PH, but no color came up on the Rapitest for Nitrogen. She has one week before she has to turn everything in, any thoughts out there???