Final answer:
The correct answer is option 4) Total Active Carbon and Total Humic Acid Treatment. It refers to the soil's organic content that is crucial for nutrient absorption, plant growth, and ecological balance within the soil.
Step-by-step explanation:
The correct answer is option 4) Total Active Carbon and Total Humic Acid Treatment. In soil science, soil suspension refers to a mixture of soil in water, which can be used to analyze the soil’s properties, including its organic material content. Total Active Carbon (TAC) is a measure of the soil's capacity to support the absorption of nutrients which are critical for plant growth and sustaining the ecological balance within the soil. The term Total Humic Acid Treatment (THAT) involves the soil treatment processes that leverage humic substances to improve soil health and fertility. Humic acids are a primary component of humic substances, which are the result of the decomposition of organic matter, particularly plants. They are very beneficial in enhancing nutrient uptake by plants and increasing the water retention capacity of the soil. Soil suspensions are analyzed to assess soil health and to determine the organic carbon content that is vital for supporting life within the soil ecosystem.
In soil suspension, TACT/CHAT stands for Total Active Carbon and Total Humic Acid Test. This test is performed to determine the amount of active carbon and humic acid present in the soil.
The TACT/CHAT test helps in understanding the overall fertility and health of the soil. Active carbon is an indicator of microbial activity and organic matter content in the soil, while humic acid is an important component of soil organic matter that contributes to soil structure and nutrient availability.