Environment and Ecology

What is the use of biochar in farming?

• 1. Biochar can be used as a part of the growing medium in vertical farming.
• 2. When biochar is a part of the growing medium, it promotes the growth of nitrogen-fixing microorganisms.
• 3. When biochar is a part of the growing medium, it enables the growing medium to retain water for longer time.

Which of the statements given above is/are correct?

[amp_mcq option1=”1 and 2 only” option2=”2 only” option3=”1 and 3 only” option4=”1, 2 and 3″ correct=”option4″]

Statement 1 is correct: Biochar can be effectively incorporated into various growing media, including those used in soilless systems like vertical farming. It can improve aeration, water retention, and nutrient availability in these media.
Statement 2 is correct: Biochar provides a porous structure and a stable surface that can serve as a habitat for beneficial soil microorganisms. Studies have shown that biochar can enhance the growth and activity of nitrogen-fixing bacteria and other microbes beneficial for plant growth, both in soil and soilless media.
Statement 3 is correct: Biochar has a high surface area and porous structure which allows it to absorb and retain water within the growing medium. This improved water retention capacity helps keep the medium moist for longer periods, reducing watering frequency and conserving water.

Biochar is a valuable soil amendment and component of growing media that improves physical properties (water retention, aeration), enhances microbial activity including nitrogen fixation, and can be used in various farming systems including vertical farming.

Besides the benefits mentioned, biochar can also help sequester carbon in the soil (long-term), improve nutrient retention, and potentially reduce the leaching of nutrients and pesticides.

In rural road construction, the use of which of the following is preferred for ensuring environmental sustainability or to reduce carbon footprint ?

• 1. Copper slag
• 2. Cold mix asphalt technology
• 3. Geotextiles
• 4. Hot mix asphalt technology
• 5. Portland cement

Select the correct answer using the code given below :

[amp_mcq option1=”1, 2 and 3″ option2=”2, 3 and 4″ option3=”4 and 5 only” option4=”1 and 5 only” correct=”option1″]

Statement 1 is correct: Copper slag is an industrial waste product that can be used as a substitute for natural aggregate in road construction. Using waste materials contributes to environmental sustainability by reducing the need for virgin resources and addressing waste disposal.
Statement 2 is correct: Cold mix asphalt technology uses asphalt emulsion or foamed asphalt at lower temperatures compared to hot mix asphalt. This significantly reduces energy consumption and greenhouse gas emissions during production and laying, making it environmentally preferable.
Statement 3 is correct: Geotextiles are used in road construction for separation, filtration, reinforcement, and drainage. They can improve the structural integrity and lifespan of roads, potentially allowing for thinner pavement layers and reducing the overall material requirement, contributing to resource efficiency.
Statement 4 is incorrect: Hot mix asphalt technology requires heating asphalt binder and aggregates to high temperatures (typically 150-190°C), leading to high energy consumption and emissions, making it less environmentally sustainable compared to cold mix.
Statement 5 is incorrect: The production of Portland cement is a highly energy-intensive process that releases significant amounts of CO2. While cement is a necessary binder in some road layers or concrete roads, its extensive use, especially compared to alternative binders or technologies, can increase the carbon footprint. Preferences for sustainability often involve reducing cement use or using supplementary cementitious materials.
Therefore, options 1, 2, and 3 are preferred for ensuring environmental sustainability or reducing carbon footprint in rural road construction.

Environmentally sustainable practices in road construction involve utilizing waste materials, employing low-energy technologies like cold mix asphalt, and using materials like geotextiles to enhance durability and reduce material use.

Other sustainable practices in road construction include using recycled concrete aggregate, fly ash, plastic waste, and adopting perpetual pavement design concepts to increase road lifespan and reduce reconstruction needs.

Steel slag can be the material for which of the following ?

• 1. Construction of base road
• 2. Improvement of agricultural soil
• 3. Production of cement

Select the correct answer using the code given below :

[amp_mcq option1=”1 and 2 only” option2=”2 and 3 only” option3=”1 and 3 only” option4=”1, 2 and 3″ correct=”option4″]

Statement 1 is correct: Steel slag is widely used as an aggregate in road construction, including for base and sub-base layers.
Statement 2 is correct: Steel slag can be used as a soil amendment in agriculture. It contains calcium, magnesium, and other elements which can help neutralize acidic soils (acting as a liming agent) and provide essential nutrients.
Statement 3 is correct: Steel slag can be used in the production of cement and concrete as a supplementary cementitious material or as an aggregate, helping to improve properties and utilize industrial waste.

Steel slag, a byproduct of the steel industry, is a versatile material with applications in construction (roads, cement), agriculture (soil amendment), and other areas due to its physical and chemical properties.

Utilizing industrial byproducts like steel slag helps in waste management, resource conservation (by replacing natural aggregates or binders), and can potentially reduce costs in construction and agriculture. Different types of steelmaking processes produce different types of slag with varying compositions and suitability for specific applications.

In the context of India, which of the following is/are considered to be practice(s) of eco-friendly agriculture ?

1. Crop diversification
2. Legume intensification
3. Tensiometer use
4. Vertical farming

Select the correct answer using the code given below :

[amp_mcq option1=”1, 2 and 3 only” option2=”3 only” option3=”4 only” option4=”1, 2, 3 and 4″ correct=”option4″]

All four practices are considered to be practices of eco-friendly agriculture.

Crop diversification enhances soil health and reduces reliance on synthetic inputs by breaking pest/disease cycles and utilizing nutrients more efficiently. Legume intensification improves soil fertility through nitrogen fixation, reducing the need for chemical fertilizers. Tensiometer use aids in precise irrigation scheduling, conserving water and energy. Vertical farming, when implemented sustainably (e.g., using renewable energy, closed-loop systems), reduces land use, water consumption, and transport emissions compared to conventional farming.

Eco-friendly agriculture encompasses a range of practices aimed at minimizing environmental impact, conserving natural resources, and promoting biodiversity while maintaining agricultural productivity. These practices often focus on soil health, water management, reduced chemical use, and resource efficiency.