The Grass Doctor

what are the differences of these fertilizers and how it effects the growth of a plant?

i have a biology experiment titled 'effects of different fertilizers to a growth of soybean' i use : Urea , SP-18, Organic, KCl, and NPK i'm really confused because the growth with the organic is very slow while the others are fast.. so what are the differences n how it effects to the growth of the plant??

Public Comments

1. hi, plant needs 19 elements for it's growth.mainly N,P&K. Sulpher and Mg. is also important elements. while, u use Urea,NPK it's effect show fast because they all are chemically prodects and easily absorb by plant root. in Organic fertilizer, i think u have to try seaweed fertilizer because it contains all the plant needed elements and also contain plant growth hormones.try it .it will give u immidiate result. best luck.
2. Plants don't know the difference between natural or synthesized fertilizers, so using one or the other doesn't matter in how well your plants will grow. What does make a huge difference is the amount of each element in the fertilizer. If you look at a package of fertilizer, it will always have three numbers, such as 3-5-15. These are Nitrogen, Phosphorus, and Potassium (NPK), respectively. These are macronutrients that constitute the majority of the requirements of plants. There are other micronutrients, but that's not important for your question. Synthetic fertilizers are able to be directly available to the plant, or can be time released. This will definitely make a difference on how fast your plant grows, depending on which formulation you have. Urea is a natural product that is made up mostly of nitrogen, and is actually the product that constitutes the "N" part of the three number system I mentioned above. Soybeans are in the Fabaceae (legumes and beans) family of plants, which are capable of nitrogen fixation. In other words, they can create nitrogen using bacteria that fix to their roots. Adding extra nitrogen to these plants isn't necessary. Nitrogen is the main element responsible for cellular growth, and large amounts of it will cause plants to grow faster. As far as the organic fertilizer you're using, one of the problems with that is the availability of all those nutrients to the plant. Just because it has those elements, doesn't mean the plant is able to absorb them. Soil bacteria have a way of using up a lot of the nutrients when there is a high amount of organic matter in the soil. However, all in all, the amount of each element in each fertilizer will affect how fast or well your plants will grow. The higher the numbers on the package, the more nutrients there are. Most organic fertilizers are less than 10% total nutrients, and in reality, most are really just "amendments" because their nutrient total is less than 5%