1. Describe management practices of selected vegetable (e.g., sukuma wiki, tomato, cabbage) and perennial crops (e.g., tea, coffee, mango, avocado).
2. Carry out selected management practices in crop production (land preparation, planting, weeding, watering, pruning, staking, mulching, pest control).
3. Explain factors considered when top-dressing a crop field.
4. Appreciate the importance of selected management practices in improving yield, quality, income and soil health.

Quick overview

Field management practices are the routine actions a farmer takes to keep a crop healthy and productive. For vegetables and perennial crops these include: correct land preparation, planting at the right time and spacing, watering, weeding, fertilizer and top-dressing, pest and disease control, staking or pruning, and harvesting. Using good practices improves yields and protects soil and water in Kenyan conditions (e.g., during long rains March–May and short rains Oct–Dec).

Management practices — Vegetables (examples)

• Land preparation: Clear weeds, plough or dig to loosen soil, make raised beds for drainage (important during heavy rains).
• Soil testing & fertiliser: If possible do a soil test; apply basal fertilizer (e.g., DAP) at planting and then top-dress with nitrogen source in splits.
• Planting & spacing: Follow recommended spacing — e.g., sukuma wiki (kale) closer spacing, tomatoes require stakes and rows about 45–60 cm apart.
• Watering/irrigation: Water regularly during dry spells. Use watering cans, furrow, or drip irrigation where available to conserve water.
• Weeding & mulching: Weed regularly to reduce competition. Mulch with crop residues to conserve moisture and reduce soil erosion.
• Pest and disease control: Scout fields weekly, remove diseased plants, use recommended pesticides only when necessary and follow label instructions; use cultural controls (crop rotation, intercropping) and resistant varieties.
• Staking and support: Stake indeterminate tomatoes to improve air flow and reduce disease.
• Harvesting & handling: Harvest at the right maturity, handle gently to reduce bruising and post-harvest losses.

Management practices — Perennial crops (examples)

• Site selection & soil conservation: For tea and coffee choose well-drained slopes; use terracing, contours and cover crops to control erosion.
• Planting & spacing: Follow recommended spacing for trees and shrubs (e.g., avocado, mango) to allow crown development and inter-row access.
• Pruning: Regular pruning of trees and shrubs improves light penetration, fruit quality and ease of harvest.
• Shade and intercrops: In coffee/tea systems manage shade trees and consider appropriate intercrops to increase income and soil cover.
• Fertiliser management: Use basal and top-dressing as the crop requires; perennial crops often need routine top-dressing in key growth periods.
• Water management: Mulch tree bases, provide supplemental irrigation during droughts (especially young trees).
• Pest and disease monitoring: Regular scouting, early removal of infected parts, and use of recommended control measures (biological or chemical) where necessary.

Top-dressing — What and why?

Top-dressing is applying fertilizer to the soil surface after the crop is established (usually to supply nitrogen during vegetative growth). It boosts growth, increases yield and corrects nutrient needs during the crop season.

Factors to consider when top-dressing (simple checklist)

• Crop type and growth stage: Young crops need less; most vegetables need nitrogen during leaf growth, fruiting crops may need potassium at fruiting stage.
• Soil fertility / test results: If soil test shows low N, P or K adjust fertilizer type and rate accordingly.
• Previous fertilizer applied: If high basal P was used, top-dress mainly with N.
• Weather and rainfall forecasts: Apply before expected rains to reduce losses; avoid top-dressing just before long dry spells or heavy winds.
• Fertiliser type and form: Use appropriate material (e.g., CAN, urea for N). Consider split applications to reduce losses and match crop needs.
• Method of application: Broadcast, side-dress or banding; place fertilizer near roots but not touching stems to avoid burning.
• Rate and timing: Follow extension guidelines or label instructions — often split top-dressing is safer and more effective than one large dose.
• Cost, safety and availability: Consider what is affordable and safe; use PPE when handling fertilizers.
• Soil moisture and incorporation: If using urea, incorporate or apply before rain to reduce volatilization.

Simple how-to (vegetable bed example)

1. Check crop stage — usually first top-dress when plants are well-established (e.g., 3–5 weeks after transplanting depending on crop).
2. Measure the field area to calculate the amount needed (or follow package/extension recommendations).
3. Evenly broadcast or side-dress fertilizer along rows, keeping clear of plant stems.
4. Lightly hoe the soil to mix fertilizer (if suitable) and water if no rain expected.

Why these practices matter (appreciation)

• Increase yield and quality — better management means more and better marketable produce.
• Protect soil fertility — practices like mulching, proper fertiliser use and crop rotation keep soils productive.
• Save water and cut costs — mulching, drip irrigation and good timing conserve water and reduce input waste.
• Reduce pest and disease risks — good field hygiene and scouting reduce losses and pesticide need.
• Increase household income and food security — better production supports family diets and income from the market.

Suggested learning experiences (practical and classroom)

Designed for classroom and school garden activities in Kenya.

Hands-on practicals (school garden)

• Set up small beds for sukuma wiki and tomatoes. Students prepare soil, plant, stake (for tomatoes), mulch and water.
• Practice a top-dressing exercise: calculate fertilizer needed for a 10 m² bed, measure and apply under teacher supervision.
• Make compost from kitchen and crop waste — compare plant growth in compost-amended vs non-amended plots.
• Pruning practice on grafted fruit trees or shrubs (demonstration by teacher), showing safe tool use.
• Field scouting and pest diary: students inspect beds weekly, record pests/diseases and recommend cultural controls.

Classroom activities and community links

• Invite a local extension officer or KALRO representative for a talk or demonstration on fertiliser and top-dressing timing.
• Role-play: groups plan a crop calendar for long and short rains showing planting, weeding and top-dressing times.
• Group projects: evaluate two management practices (e.g., mulch vs no mulch) and present findings with simple charts/photos.
• Visit a nearby farm (tea/coffee/fruit) to observe pruning, shade management and erosion control methods.

Assessment ideas

• Practical test: correctly perform a top-dressing operation on a small plot (safety & technique).
• Short written quiz: match practices to benefits; explain factors in top-dressing.
• Project report: keep a farm diary for 6–8 weeks showing crop growth, inputs and problems with photos/drawings.

Materials, resources & safety

• Common materials: hoe, spade, rake, watering can, mulch material, stakes & twine, pruning shears, knapsack sprayer (for teacher use), gloves and gumboots.
• Fertilizers commonly available in Kenya: DAP (basal P), CAN or urea (N) — follow extension advice for rates.
• Safety: always wear gloves and masks when handling pesticides or concentrated fertilisers; store chemicals locked away; follow label instructions.

Quick visual cues

🌱 Planting & spacing • 💧 Watering • 🌿 Weeding & Mulching • 🪓 Pruning • 🧑‍🌾 Top-dress on growth • 🧰 Use PPE