Find out the 13 nutrients that plants need to grow that is reported in the Macro Factor in Soil Science Fair Project Abstract which talks about pH and Macronutrients.
Megan Guerrero – Home Schooled
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Project Research and Problem
After noticing that in my backyard some plants thrived and others did not, I wanted to find out what causing this. After researching the topic, I learned that aside form the necessary water and sunlight a plant needs to grow, there are thirteen nutrients that affect the growth of plants. Most everything I read also indicated that there are four major factors that affect the growth of plants. They are the level of pH in the soil and three macronutrients—Nitrogen, Potassium, and Phosphorus.
I decided that the pH, Nitrogen, Phosphorus, and Potassium levels in the soil may be affecting plant growth. I figured the pH of the soil was fine, but thought maybe the macronutrients were low in some areas and adequate in other, thus causing the varied plant growth.
I prepared for my experiment by gathering the following materials: My log book, a Rapitest soil test kit, measuring cups, distilled water, paper plates, plastic cups, a timer, and for safety purposes, protective eye gear and latex gloves.
To confirm my hypothesis, I collected 10 soil samples throughout the yard where the plants showed signs of growth problems and areas where growth was normal. I then used the Rapitest Soil Test kit to determine the levels of the pH, Nitrogen, Phosphorus, and Potassium levels in the soil.
The pH level of the soil in my backyard was within its normal range and therefore allowed for all nutrients to be absorbed. The Potassium and Phosphorus levels varied but were within normal range for the plants in my yard. Nitrogen levels, however, showed signs of deficiency in almost every area.
So, I proved my hypothesis correct. The pH in my yard was within its normal range, which made the nutrients in the soil available to the plants. And as I expected, the soil’s macronutrients were causing the problems with my plants. Any number of reasons could be contributing to the depletion of the macronutrients—leaching, plant growth, lack of organic matter, or even the fact that there has been no commercial fertilizer added to my backyard in over 2 years.
I would say it is time to replenish the macronutrients in my yard, but I think I will avoid commercial fertilizers and try my hand at creating my own organic fertilizer. I have been doing a little research on composting and compost tea as a way to replenish my soil’s Nitrogen. Then not only can I rest on my porch swing and enjoy a green healthy view, but I can know that my fertilizer is having a positive effect on the environment.
What I Would Do Differently
In future projects I would test the soil samples more then once to reduce the amount of experimental error. I would also test through out the year (spring, summer, autumn, and winter) to find out if the time of year could possibly affect the levels of pH, Nitrogen, Potassium and Phosphorus in the soil. I would also like to test the soil after a fantastic thunderstorm to see how much Nitrogen entered the soil. Another thing I could test for are the micronutrients. Plants need 13 essential elements from the soil. Maybe they were deficient in one of the micronutrients.
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IOP Science Has the latest research about organic soil.