![]() You will limit your study to one type of soil (store-bought potting soil), one type of castings (store-bought or from the same harvest of a worm farm) and 2–3 types of plants. In this project, you will grow plants in pots containing various amounts of earthworm castings mixed into the potting soil, and evaluate their growth and health. Can you figure out a general guideline? Is it possible to mix too many castings into the soil? Note that the nutrient content of worm castings depends on the food the worms consumed. The answer will depend on the quality of your soil, the type of plants you would like to grow, and the particular worm castings used. You might wonder about the amount of worm castings you should add to your soil to get optimal plant growth. ![]() Worm castings also improve the soil texture, soil aeration, and water retention. In addition, the nutrients in vermicompost are released slowly over time. The worm's gut converts nutrients that available in organic matter they eat into a form that is readily taken up by plants. Using vermicompost has some important benefits. Adding earthworm castings is an environmentally friendly alternative that is safe for pets and children. Some gardeners add animal manure or chemical fertilizers to improve the nutrient content of the soil. In addition to air, water and sunlight, young plants need nutrients from the soil-like nitrogen, phosphorus, and potassium-to grow and prosper. Enrich your soil with worm castings before potting the plant.
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