Zeolite, mineral fertilizer and humic acid impact on biomass carbon in soil

An agricultural study was carried out on one of the farms in the Al-Nouriah district of the Al-Diwaniyah governorate during the autumn season (2021–2022). to investigate the impact of the zeolite, humic acid, and urea on the activity of the enzyme urease for the stages of blooming and full maturity. An investigation with three factorials was conducted. Factors that are compliant with the randomized complete block design The experiment employed the three fertilizer factors listed below: The first factor was zeolite mineral, which has three levels (0, 200, and 400) kg h−1 and is symbolized by the letters Z0, Z1 and Z2; the second was humic acid, which has two levels (0 and 33) litres h−1 and is represented by the letters H0 and H1; and the third was urea, which has three levels (0, 50, and 100) kg N h−1 and is symbolized by the letters U, which stands for ure (U0, U1 and U2). The fertilizer combination resulting from the triple interaction of the study factors (Z1H1U1) achieved the highest mean of biomass carbon in the flowering and complete ripening stages of (264.6 and 170.6) mg C kg soil-1, respectively, compared to the control treatment (Z0H0U0), which recorded the lowest average of biomass carbon Viability was (129.7 and 112.1) mg C kg soil−1, respectively.