(a) Explain the productive, protective, ameliorative, recreational, educational and developmental functions of Indian forests…

(a) Functions of Indian Forests

Indian forests provide multi-dimensional ecological, economic, and developmental services regulated under the framework of the National Forest Policy 1988.

Productive functions: Forests yield valuable timber (teak and rosewood from the Western Ghats) and essential Non-Timber Forest Products (NTFPs), including tendu leaves, bamboo, and resins. These forest products sustain extensive commercial wood industries and rural cottage enterprises.

Protective functions: Forest canopies intercept high-intensity rainfall, reducing kinetic splash erosion, while extensive root networks stabilize topsoil. This process safeguards critical catchments in the fragile Shivalik hills and mitigates storm surges and coastal erosion via mangrove buffers in the Sundarbans.

Ameliorative functions: Dense vegetation regulates carbon cycles through substantial carbon sequestration, particularly within Himalayan moist temperate forests. Forests also moderate microclimates by enhancing evapotranspiration, lowering ambient temperatures, and maintaining localized hydrological cycles.

Recreational functions: Natural forest ecosystems, such as Jim Corbett and Ranthambore National Parks, foster regulated ecotourism, providing aesthetic value, generating local employment, and generating revenue for wildlife conservation.

Educational and research functions: Undisturbed biomes act as primary living laboratories for evolutionary studies and biodiversity conservation, exemplified by research in Silent Valley and technical forestry research at the Forest Research Institute (FRI), Dehradun.

Developmental functions: Forests drive inclusive rural growth through Joint Forest Management (JFM) and the National Agroforestry Policy 2014, securing forest-dwelling tribal livelihoods via legal collection rights over minor forest produce and sustainable silvopastoral systems.

(b) Weed Seed Bank and Strategies to Reduce It

The weed seed bank is the total reservoir of viable weed seeds and vegetative propagules present on the soil surface and throughout the soil profile. The highest concentration occurs in the top 0–10 cm plough layer. Seeds persist across multiple seasons due to physiological dormancy mechanisms, thick impermeable seed coats, and chemical inhibitors that prevent premature germination until optimal hydrothermal conditions occur.

Reducing the weed seed bank requires target-specific strategies:

Cultural strategies: The stale seedbed technique involves early seedbed preparation and light irrigation to induce a premature flush of weed emergence, which is then destroyed prior to crop sowing. Rotating crops with varied canopy architectures and life cycles disrupts weed species dominance and life-cycle completion.

Mechanical strategies: Deep mouldboard plowing inverts the soil, burying surface seeds below their maximum emergence depth to cause fatal germination or prolonged decay. Conversely, selective shallow inter-tillage exposes deep-seated dormant seeds to lethal surface desiccation.

Biological strategies: Biofumigation via the incorporation of glucosinolate-rich Brassica cover crops releases volatile isothiocyanates that inhibit weed seed germination. Planting fast-growing smother crops (e.g., cowpea) suppresses weed reproduction and subsequent seed rain.

Chemical and integrated strategies: Soil-applied pre-emergence herbicides (such as pendimethalin or pretilachlor) kill weed seedlings as they germinate, before they can add to the seed bank. Integrating these cultural, mechanical, and chemical tactics under Integrated Weed Management (IWM) steadily exhausts the dormant seed reservoir over successive cropping seasons.

(c) Need for INM and INM for Transplanted Rice

INM combines inorganic fertilizers, organic manures, and bio-inoculants to sustain soil fertility and crop productivity. The urgent need for INM arises from declining factor productivity in intensive monocultures, imbalanced NPK application ratios, widespread micronutrient deficiencies (notably Zinc in submerged soils), deteriorating physical and biological soil health, rising chemical input costs, and environmental hazards like nitrate leaching into groundwater. The Soil Health Card Scheme emphasizes this balanced approach.

For transplanted rice, INM is implemented through:

Organic manures and residue recycling: In-situ green manuring with Sesbania aculeata (dhaincha) or Crotalaria juncea (sunnhemp), incorporated 45–50 days after sowing (supplying 60–80 kg N/ha), supplemented by 5–10 t/ha of well-decomposed Farmyard Manure (FYM). Composted paddy straw is recycled back into the soil to replenish potassium and silica.

Biofertilizers: Dual cropping of Azolla caroliniana or Azolla pinnata (which contributes 20–30 kg N/ha upon decomposition), along with seedling root dip or field inoculation using Blue Green Algae (BGA) and Phosphate Solubilizing Bacteria (PSB) to enhance phosphorus availability in reduced soil conditions.

Inorganic fertilizer scheduling: Soil-test-targeted chemical fertilization involves applying 100% of the recommended phosphorus (via DAP) and potash (MOP) as a basal dose, combined with 25 kg/ha zinc sulphate. Nitrogen application is split into three equal stages (basal, active tillering, and panicle initiation) and dynamically calibrated using a Leaf Colour Chart (LCC) to synchronize nitrogen supply with crop demand and prevent volatilization losses.