b'IntroductionFertilization is an important concern in the cultivation of strawberries and strawberry plants. But still can the fruits and plants not grow as desired. The following pages briefly discuss the external characteristics that a plant can display when there is a lack or excess of a particular mineral. When in doubt, engage an advisor who can conduct further investigation.NitrogenNitrogen in the plant has many functions. It ensures growth and photosynthesis of the plant and is a building block of proteins and DNA. More than 50% of the nitrogen uptake is involved in the photosynthesis in the leaves. The plant can absorb some forms of nitrogen; urea, nitrate and ammonium. Strawberry plants can also absorb organic nitrogen from the soil.Urea is converted in the soil and substrate into ammonium, then into ammonia and then into nitrate. These processes are very complex and depend on pH, temperature, sufficient oxygen and moisture in the substrate or soil, the activity of soil life and plant activity. The disadvantage is that ammonia can volatilize during the conversion, ammonia is an intermediate step in the conversion of urea to ammonium. Ammonium (NH4 +) is actively absorbed by the plant, which means that this process requires energy and is temperature dependent. The plant itself can also convert part of nitrate into ammonium. The ammonium is built into the cell of the roots or is transported through the wood vessels to the sprouts.108'