||Plants use carbon dioxide to make oxygen for us humans to breathe, they use water and sunlight to do the process called photosynthesis, and they gather the nutrients they need through their roots planted in the soil. Plants need certain levels of pH to survive, and they require certain macro and micro nutrients to grow. Why does the plant, when it grows to tall, tend to fall over? What can we do to help support the plant? Why doesn't the plant grow upwards towards the light? Are their any other ways to grow a healthy plant without certain nutrients?
||How much water can our soil/sand mixture retain? If we add the same amount of water to both mixtures, how will the soil moisture differentiate? We know that sand retains more water, than the normal soil, so if we add the same amount of water, our 20/20/20 mixture being our control group, we will hopefully notice a difference in the soil moisture overall affecting the plants.
||The possible outcomes of the study would include possible growth declination, dry soil, more time for petals or leaves to grow, and we would see weak plants in the sand/soil mixture and healthy plants in the 20/20/20 mixture. The sand holds more moisture, however, it takes more water to keep the soil from drying which could cause major growth problems with plants in the sand/soil mixture.
||The plan for our experiment would be to add the amount of water needed to the 20/20/20 mixture to keep the soil moist and add the same amount we added to the 20/20/20 to the sand/soil mixture. We will keep track on how dry or moist each soil mixtures get as the plants continue to grow. We will keep the temperature of the water consistent, and change the amount of water depending on how much the control plant needs. Our hypothesis is: If we add the same amount of water to both 20/20/20 mixture and sand/soil mixture, then the plants in the 20/20/20 mixture will grow healthy and strong.
||High School Students (Grades 9,10,11,12)
||Van-Far Jr./Sr. High