Masters Thesis

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IMPACT OF NITROGEN FERTILIZER AND COMPOST INCORPORATION ON pH AND pH BUFFERING CAPACITY OF NON-CALCAREOUS SOIL
(HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR-5200, BANGLADESH, 2023-12) KAYES, MD. IMRUL; Khan, Dr. Md. Shahadat Hossain; Abdulaha-Al-Baquy , Dr. M.
Non-calcareous soils are a significant component of Bangladesh's diverse soil landscape, particularly in the northern regions where agricultural practices are integral to the economy characterized by low calcium carbonate concentrations, these soils are prone to acidity, impacting nutrient availability and crop yields. The escalating use of nitrogen (N) fertilizer and compost raises concerns about potential soil acidification. This study aims to comprehensively assess the impact of nitrogen fertilizer and compost on soil pH and pH buffering capacity in non-calcareous soils. Specific objectives include examining the effects of these inputs on soil pH and buffering capacity and investigating key driving factors influencing these parameters. To fulfill the objective of the research, a lab-based experiment was designed in the laboratory of the Department of Soil Science of Hajee Mohammad Danesh Science and Technology University, Dinajpur. A 40-days incubation study was conducted. The treatments were 1) Soil (Control), 2) Soil+ 300 mg N as urea (H-Urea), 3) Soil+ 150 mg N as urea (L-Urea), 4) Soil+ 300 mg N as compost (H-Compost), 5) 150 mg N as compost (L-Compost), 6) Soil+ 300 mg N as urea + 150 mg N as compost (H-Urea + L-Compost), and 7) Soil+ 150 mg N as urea + 300 mg N as compost (L-Urea + H-Compost). The treatments were replicated three times in a complete randomized design. Soil samples were subsampled at 5, 10, 15, 20, 25, 30 and 40 days after the start of the experiment. At each subsampling, pH measurement was taken. The result revealed that pH was increased rapidly by the incorporation of urea fertilizer and combined use of H-Urea+ L-Compost. Lowest was found in control treatment. The highest pH buffering capacity was found in the treatment of H-Compost and lowest in H-Urea treatment. Organic matter was found the highest 3.20% in L-Urea+ H-Compost and the lowest in high urea treatment. The highest cation exchange capacity was found in L-urea+ H-compost and the lowest was in control treatment. Total base cation was highest in the L-Urea+H-Compost and lowest in the control treatment. The Ca, Mg, K and P were also found highest in treatment L Urea + H-Compost. In case of Na and total N%, treatment H- compost had the highest value. Therefore, it is recommended that the application of higher compost and lower urea can increase the pH buffering capacity, nutrients availability and reduced soil acidity.
LOCALLY PRODUCED CO-COMPOSTED BIOCHAR ENHANCES NUTRIENT AVAILABILITY AND MAIZE GROWTH IN LOW-FERTILITY SOILS: A FIELD STUDY
(HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR-5200, BANGLADESH, 2023-12) Asif, Al-Mushabber; Rahman , Professor Dr. Md. Mansur; Abdulaha-Al-Baquy , Dr. M.
Recent biochar use has garnered attention as a possible sustainable agriculture method. By improving plant nutrient availability, biochar boosts agricultural output. Independent farmers are discouraged from buying the product due to its high price. Biochar has been tested with fertilisers and organic manures to ensure its economic sustainability. In infertile soils, co composted biochar (COMBI) affects phosphorus (P) availability. Our work evaluates maize plant phosphorus absorption in soil following co-composted biochar application. A carefully organised randomised complete block design (RCBD) experiment was used to do this. Each 1m2 plot in the experimental field was randomly allocated one of six treatments: a) control, b) compost, c) ash, d) biochar, e) poultry litter, and f) COMBI. Each patch received 1kg of soil amendments. The study collected, dried, and analysed maize plant parts above ground for 60 days. Similar to the treatments, soil samples were taken for analysis. This study found that COMBI boosted plant growth, biomass, and nutrient absorption, including nitrogen, phosphate, potassium, calcium, and magnesium. COMBI also increased soil organic matter, cation exchange capacity (CEC), calcium, magnesium, and potassium levels. The research demonstrated that COMBI is a highly promising soil amendment that enhances the availability of phosphorus in low-fertility soil and promotes increased phosphorus absorption by plants.
LOCALLY PRODUCED CO-COMPOSTED BIOCHAR ENHANCES NUTRIENT AVAILABILITY AND MAIZE GROWTH IN LOW-FERTILITY SOILS: A POT STUDY
(HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR-5200, BANGLADESH, 2023-12) Rusha, Farhana Rahman; Rahman, Professor Dr. Md. Mansur; Abdulaha-Al-Baquy , Dr. M.
Recently, the utilization of biochar has gained significant significance as a means of adopting sustainable agriculture. Biochar has the remarkable ability to increase agricultural output by improving the availability of nutrients to plants. However, the very high cost renders it unfeasible for farmers to obtain independently. Hence, to guarantee the economic viability of its implementation, the utilization of biochar in conjunction with fertilizers and organic manures has been examined. This study investigates the impact of co-composted biochar (COMBI) on the availability of phosphorus (P) in soil with low fertility. The aim of our study was to assess the uptake of P by maize plants in the soil after the application of organic-coated biochar. The experiment had six treatments: a) Control, b) Compost, c) Ash, d) Biochar, e) Poultry litter, and f) COMBI and applied at the rate of 10% (w/w). The experiment was conducted using a completely randomized design (CRD) with three replications. Each pot was filled with a mixture of 4.0 kg of soils and experiment duration was 60 days, during which the plants and roots were gathered, dried, and subjected to analysis. The soil samples were analyzed in correlation with the treatments. The findings demonstrated that COMBI surpasses alternative treatments, leading to enhanced plant growth, elevated overall biomass mass, and enhanced absorption of nutrients such as nitrogen, phosphorus, potassium, calcium, and magnesium. In addition, COMBI also results in increased organic matter percentage, cation exchange capacity (CEC), and concentrations of calcium, magnesium, and potassium. Thus, the findings validated that COMBI is a remarkably potent soil additive, substantially augmenting crop yield and fostering plant proliferation and maturation.
MODIFIED CROP STRAW DERIVED BIOCHAR INCORPORATION IMPACT ON MAIZE PLANT GROWTH AND PHOSPHORUS AVAILABILITY IN LOW-FERTILITY SOIL
(HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR-5200, BANGLADESH, 2023-12) HASAN, MD. RAKIBUL; Abdulaha-Al-Baquy , Dr. M.
Phosphorus (P) is an important plant nutritional element, but its supply is limited since it is a nonrenewable resource. The objective of this study was to investigate the maize plant growth and soil available phosphorus status in modified rice straw biochar in lowfertility soils of northern Bangladesh. To fulfill the objectives of the research a 40days pot experiment was established with the following treatments: a) control (without biochar+KH2PO4,), b) fresh rice straw biochar2%+KH2PO4, c) H2O2+2% fresh rice straw biochar+KH2PO4, d) H2SO4+2% fresh rice straw biochar+KH2PO4 and e) HNO3+2% fresh rice straw biochar+KH2PO4 and replicated three times in a completely randomized design (CRD). The results indicated that incorporation of hydrogen per oxide modified rice straw biochar increased the pH value (5.85) of the soil significantly. On the other hand, soil available P value (95.42 ppm) also increased due to application of nitric acid modified rice straw biochar. Plants dry weight value (4.44gm pot-1) also increased due to application of nitric acid modified biochar. The P availability increased due to changing of soil properties like pH, OM, CEC, base cations (Ca, Mg, K and Na) after incorporation of acid modified biochar. The maize plant growth was higher yield in nitric acid modified rice straw biochar than the other treatments. Therefore, it may be suggested to consider nitric acid modified rice straw biochar application for enhancing soil health as well as obtaining higher yield of crop.