University of Tehran Press Iranian Journal of Soil and Water Research 2008-479X 53 10 2022 12 22 Comparison of the effect of sugarcane bagasse and rice straw residues on some quality characteristics of a sodic vertisols Comparison of the effect of sugarcane bagasse and rice straw residues on some quality characteristics of a sodic vertisols 2333 2347 91503 10.22059/ijswr.2022.346462.669330 FA Firouzeh Nourmandipour Ph.D. Student Department of Soil science, Faculty of Agriculture, University of Zanjan, Iran Mohammad Amir Delavar Associate Professor Department of Soil science, Faculty of Agriculture, University of Zanjan Rattan Lal Carbon Management and Sequestration Center, The Ohio State University, USA Stephen Joseph School of Material Science and Engineering, University of NSW, Sydney, Australia, Christian Siewert Faculty of Landscape Management, University of Applied Sciences Dresden, Germany Journal Article 2022 07 29 The present study investigated and compared the effects of two types of crop residues, sugarcane bagasse (BG) and rice straw (RH), on some soil chemical properties and enzymatic activities related to the carbon and phosphorus cycle in sodic vertisols (control, C). The pot experiment was conducted in four replications using the factorial structure in complete randomized design in the greenhouse of Zanjan University in 2016. The factors of this experiment included two type of organic amendment (BG and RH), three application rates (L₁=1.25%, L₂=2.5% and L₃=5% by weight) and four incubation times (two (M₂), four (M₄), eight (M₈) and twelve (M₁₂) months). Some of the most important chemical and biological properties were measured after the treatments. The results showed that values of soil organic carbon (SOC), carbon to nitrogen ratio (C:N), and available phosphorus (AP) were significantly (p< 0.001) affected by the type of organic amendments, their application rate, and incubation time. The highest and lowest SOC values were measured in the BGL₃M₂ and RHL₁M₁₂ treatments, respectively. Changes in SOC and total nitrogen (TN) were increasing by increasing the amount of organic amendments and decreasing by increasing incubation time. Total nitrogen in the RHL₃M₁₂ treatment increased 51.6% compared to the RHL₁M₁₂ treatment and decreased 8.5% (p<0.01) compared to the RHL₃M₂ treatment. AP in BGL₃M₁₂ treatment had a significant increase of 21.5% compared to BGL₂M₁₂ treatment. The highest alkaline and acid phosphatase activity was related to RHL₃M₁₂ (18.6 µg PNP g^-1h^-1) and BGL₃M₁₂ (7.1 µg PNP g^-1h^-1) treatments, respectively. RHL₃M₁₂ and BGL₁M₂ treatments showed the highest and lowest beta-glucosidase activity, respectively, and showed a significant difference of 87.5% and 70.3% with the control treatment. The highest and lowest levels of microbial biomass carbon (MBC) were related to RHL₃M₂ (71.5 mg kg^-1) and BGL₁M₁₂ (28 mg kg^-1) treatments, respectively. The present study investigated and compared the effects of two types of crop residues, sugarcane bagasse (BG) and rice straw (RH), on some soil chemical properties and enzymatic activities related to the carbon and phosphorus cycle in sodic vertisols (control, C). The pot experiment was conducted in four replications using the factorial structure in complete randomized design in the greenhouse of Zanjan University in 2016. The factors of this experiment included two type of organic amendment (BG and RH), three application rates (L₁=1.25%, L₂=2.5% and L₃=5% by weight) and four incubation times (two (M₂), four (M₄), eight (M₈) and twelve (M₁₂) months). Some of the most important chemical and biological properties were measured after the treatments. The results showed that values of soil organic carbon (SOC), carbon to nitrogen ratio (C:N), and available phosphorus (AP) were significantly (p< 0.001) affected by the type of organic amendments, their application rate, and incubation time. The highest and lowest SOC values were measured in the BGL₃M₂ and RHL₁M₁₂ treatments, respectively. Changes in SOC and total nitrogen (TN) were increasing by increasing the amount of organic amendments and decreasing by increasing incubation time. Total nitrogen in the RHL₃M₁₂ treatment increased 51.6% compared to the RHL₁M₁₂ treatment and decreased 8.5% (p<0.01) compared to the RHL₃M₂ treatment. AP in BGL₃M₁₂ treatment had a significant increase of 21.5% compared to BGL₂M₁₂ treatment. The highest alkaline and acid phosphatase activity was related to RHL₃M₁₂ (18.6 µg PNP g^-1h^-1) and BGL₃M₁₂ (7.1 µg PNP g^-1h^-1) treatments, respectively. RHL₃M₁₂ and BGL₁M₂ treatments showed the highest and lowest beta-glucosidase activity, respectively, and showed a significant difference of 87.5% and 70.3% with the control treatment. The highest and lowest levels of microbial biomass carbon (MBC) were related to RHL₃M₂ (71.5 mg kg^-1) and BGL₁M₁₂ (28 mg kg^-1) treatments, respectively. https://ijswr.ut.ac.ir/article_91503_684882f0c57f2e0c2980139a71ba8bf6.pdf