A joint research team consisting of the teacher, Dr. Kazem Muhammad Abdullah (College of Agriculture – University of Karbala), in cooperation with a research team from (Griffith University), one of the most prestigious Australian universities, published a scientific research in the Journal of Soils and Sediments, which is issued by the publishing house. The international (Springer) and included in the first quarter (Q1) classifications within Scopus containers with an impact factor: 3.308, site score (5.2) and (H index: 73). And its properties, nutrition and plant physiology. The research dealt with the study of the long-term effect of controlled fires on the biological fixation of nitrogen by acacia species found in forests using the nitrogen isotope 15 (N15), the efficiency of water use using the isotope carbon 13 (C13), and the growth of plants for the burning cycle 6-14 years. The study included the collection of plant leaf samples for two acacia cultivars from different regions according to the burning date to cover a complete burning flask for three seasons. Nitrogen is vital in improving plant water efficiency and thus tree growth in natural forests.
