Phosphorus (P) is part of the nucleic acid structure of plants which is responsible for the regulation of protein synthesis. Phosphorus plays a major role in the growth of new tissue and division of cells. Plants perform complex energy transmissions, a function that requires phosphorus. If the value of phosphorus in your land is low, this can be stressed enough. One of the benefits of phosphorus in plants is proper development of the roots and hastening of maturity. Phosphorus is an effective

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... ement in root development. The aim of this study is to determine the effects of phosphorus fertilizer on seedling development in seedling production. Amounts of nitrogen, phosphorus and potassium as fertilizer applications in seedling cultivation affect seedling quality. Effects of different doses phosphorus (0, 50, 100 and 150 ppm) application on the quality of cucumber seedlings were investigated at in the study. Istek F1 pepper cultivar was used. Macro nutrients were 100 ppm N, 100 ppm K, and the appropriate nutrients were given in the appropriate amount. Phosphorus applications on plant seedlings were effective on the development of vegetative parts of the plant at a statistically significant 1% level. At the end of a 35-day development period, seedling length was measured as 6.56 cm in the control application and 10.7 and 10.4 cm in the 100 and 150 ppm application of phosphorus doses, respectively. Hypocotyl length was 1.58 cm in control application, 1.66 in 50 ppm, 2.02 cm in 100 ppm P and 1.56 cm in 150 ppm application. Leaf number, stem diameter, root height, root weight and leaf wiegt were determined in the study. Phosphorus applications increased the amount of leaf weight and root weight. It was determined that 50 ppm P application was insufficient, ideal results were obtained in between 100 and 150 ppm P application. The ideal seedling for sale is neither too short nor too long. Medium size and good root development is the desired feature in seedlings.