Mulberry (Shahtoot) Farming in Kolar: Practical Guide
Introduction
Kolar district’s semi-arid climate with well-defined dry and wet seasons suits mulberry (shahtoot) when growers match variety choice, soil and water management. This guide focuses on practical steps — what to do in the field, common problems you will meet, and actions that actually work for small to medium commercial blocks.
Site and Soil Requirements
Mulberry adapts to a wide range of soils but performs best on well-drained loam to sandy-loam soils with good organic matter. Key considerations for Kolar:
- Soil depth: Prefer soils deeper than 60 cm for root development.
- Drainage: Avoid waterlogged patches; mulberry roots suffer under prolonged saturation.
- Soil pH: 6.0–7.5 is acceptable. If pH is below 5.5, liming is recommended based on a soil test.
- Salinity: Watch out for saline pockets. High EC reduces leaf quality and growth.
Variety Selection
Choose varieties adapted to local climate, intended use (silkworm rearing or fruit market) and available planting material. In Kolar, growers commonly use:
- Fast-growing white mulberry selections for sericulture — select disease-resistant clones if available.
- Black/purple-fruited types where fruit sales are the target (shahtoot marketed as fruit).
Obtain grafted or rooted cuttings from reputable nurseries. Genetic uniformity matters for leaf quality if you plan to supply cocoon farmers.
Land Preparation and Planting
Prepare the field during the dry season to allow soil work before monsoon planting. Steps:
- Clear weeds and deep plough 2–3 passes where possible to break hardpans.
- Apply well-rotted farmyard manure or compost at 10–15 tonnes/ha before final levelling.
- Layout rows: for commercial leaf production a common spacing is 2.5–3 m between rows and 1.5–2 m within row (row x plant). Closer spacing gives quicker canopy closure but requires more pruning and inputs.
- Dig pits 45–60 cm and backfill with topsoil mixed with compost and a handful of superphosphate if available.
- Plant during the onset of monsoon (June–July) for best establishment. Use rooted cuttings or polybag saplings.
Propagation
Multiplication is commonly done by:
- Rooted cuttings (stem cuttings) — cost-effective and widely used.
- Grafting — used to introduce superior scion on hardy rootstock for consistent fruit/leaf quality.
- Suckers — less common for uniform orchards.
Ensure planting material is healthy, pest-free and handled with minimal root disturbance.
Irrigation Management
Water is the defining input in Kolar. Establish a schedule tailored to season and soil:
- Establishment year: keep soil moist — irrigate every 7–10 days in dry spells.
- Established trees: water deeply at longer intervals. Frequency depends on soil type: sandy soils need more frequent irrigation than loams.
- Mulberry responds well to drip irrigation — conserves water and supports regular leaf production cycles.
- Avoid overwatering during rainy season; allow soil to dry moderately between irrigations to reduce root disease risk.
Nutrient Management
Base fertilizer doses on soil test if possible. General recommendations for annual leaf orchards:
- Apply well-rotted FYM or compost annually (5–10 t/ha as maintenance) to support soil health.
- N-P-K: A common practical program is split applications of nitrogen and moderate P and K through the year. For example, split nitrogen in 3–4 doses aligned with growth flushes, and basal P and K.
- Micronutrients: Zinc and boron deficiencies are reported in parts of Karnataka. Correct promptly after soil or leaf test results.
Pruning and Leaf Management
Pruning shapes trees, encourages coppicing for leaf harvest and simplifies harvest operations:
- Initial training: form 1–2 main stems in the first year, remove competing shoots.
- Pollarding/coppicing: For leaf production, cutbacks to 30–60 cm above ground often produce multiple shoots used for successive leaf harvests.
- Timing: Prune before major flushes or at the end of dry season to synchronize regrowth with rains or irrigation.
- Remove dead or diseased wood immediately. Maintain sanitation to reduce pest and disease inoculum.
Pest and Disease Management
Practical field control and monitoring matter more than expensive inputs. Common issues in Kolar:
- Leaf-eating caterpillars and gram caterpillars — remove manually where possible, use biopesticides (Bacillus thuringiensis) or recommended insecticides if thresholds exceeded.
- Whiteflies and aphids — monitor underside of leaves; use neem-based sprays or insecticidal soaps early, and encourage predators like ladybirds.
- Powdery mildew and leaf spot — maintain air flow by pruning, remove infected leaves, and use copper or sulphur fungicide sprays when necessary.
- Root rot (Phytophthora) — avoid waterlogging, improve drainage and consider fungicide drenching for severe cases.
Practice crop sanitation, remove alternate hosts and maintain balanced nutrition to reduce severity of outbreaks.
Harvesting
Harvest strategy depends on purpose:
- For sericulture (leaf for silkworms): Harvest young, tender leaves during growth flushes. Harvest frequency may be weekly to biweekly depending on growth.
- For fruit (shahtoot) sales: Pick ripe berries by hand. Fruit is perishable — harvest into shallow containers to avoid crushing.
Leaf quality is highest when harvested early in the morning and when shoots are young. For multiple cuts, leave sufficient leaf area after harvest to allow for quick regrowth.
Yield Expectations and Record-Keeping
Yields vary with variety, plant spacing, management and water. Instead of fixed numbers, track your own records for:
- Leaf weight per plant per harvest and number of harvests per year.
- Fruit weight per tree if growing for berries.
- Input costs: fertiliser, irrigation, labour and plant protection.
Local extension services or nearby growers can give realistic yield ranges for your chosen clone; use their experience to refine your enterprise budgeting.
Post-Harvest Handling and Marketing
For fruit markets: sort and pack immediately. Keep fruits cool and sell quickly or process into value-added products (jam, dried berries) to lengthen shelf life.
For leaf markets (sericulture): Deliver fresh, cool, and clean leaves to buyers on scheduled days. Consistency in quality secures repeat buyers.
Practical Tips from the Field
- Water first, fertilize second: In Kolar’s soils, irrigating before fertilizer application improves uptake and avoids salt stress in the root zone.
- Start small and scale: Try a demonstration block of 0.1–0.5 ha to test variety and irrigation method before large investments.
- Keep records: Track plant spacing, seedling source, fertilizer timings, pest incidents and harvest yields — this drives improvement.
- Integrated approach: Combine clean planting material, balanced nutrition, timely pruning and regular monitoring rather than depending on a single ‘solution’ to problems.
- Community coordination: For sericulture suppliers, coordinate harvest schedules with cocoon rearers to avoid supply gluts or shortages.
Economics and Labor
Mulberry is labour-intensive at establishment and for repeated leaf harvests. Plan for seasonal labour peaks at pruning and harvest. Use mechanisation for land preparation and simple tools (pruning shears, harvesting combs) to reduce hand fatigue and time.
Conclusion
Mulberry (shahtoot) is well-suited to Kolar when you match variety, water management and pruning system to your market. Focus on good planting material, soil health, timely water and sanitation, and you will get steady production. Start with a small trial block, keep practical records, and adapt practices based on local experience and buyer requirements.