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Abstract Fertilization can greatly affect the quality of crops and soil. To determine the effects of long-term fertilization on crop productivity and measure the stoichiometry of carbon, nitrogen, and phosphorus in the soil, a study was conducted in the laboratories of the Department of Agricultural Technology, College of Biotechnology, and Al-Qadisiyah University. Agricultural soil fertility is crucial to the future of agriculture, and to analyze soil elements, two organic fertilizer sources (cows and sheep) totalling 25 kg were included in the main plots. In addition, the research also included sub-plots at three levels of potassium sulfate fertilizer (10 and 20 kg). These plots of land were designed and interpreted according to the RCBD method, which was unique in application. To evaluate the need to use nutrients in fertilizers to maintain soil fertility. The analysis of soil elements aims to evaluate the availability of nutrients in the depths of the soil from which samples were taken from different areas in the city of Diwaniyah in Iraq. Fertilizer recommendations are also linked to the soil index. The recommendations have broad applicability, although they may need to be modified to suit individual soil types and cropping systems in light of local experience. Basing fertilizer recommendations on soil element analysis and indexing systems provides significant benefits. The system uses simple, proven, low-cost analysis methods as part of a complete soil management program that recognizes the paramount importance of ensuring that all soil properties are within their optimum levels.
Sharoot et al. (Mon,) studied this question.