Re: can a plant surive on greywater and sunlight alone?

The simple answer is yes, if it is in soil. To make a good science project you need plants in both good soil, watered with normal or drinking water, and some in soil watered with greywater. Be sure to use enough plants (20 or 30 of each set) to have a valid answer when you are done. What variety of plants are you thinking about using? There are several seeds available around households, most bird seeds will germinate, as will regular popcorn or dry beans. How are you going to measure the difference between your control and your variable? Height is not a good measure as it is affected by light intensity. I suggest using oven dry weight, (have your teacher explain this). If your school has a greenhouse maybe they will let you put your plants in it, or if your home has a window with good sun exposure. Over the years I have judged many science fairs where students did not have enough light, and the plants were long and spindly — beans are very bad about doing this. If your parents of teacher would like to visit with me more about your project is am happy to visit with them. My office number is 800-324-7487. Dale Softley Forensic Agronomist Lincoln, NE