Lesson Notes By Weeks and Term v4 - JHS 3
CROP PRODUCTION
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CROP PRODUCTION
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Subject: Science
Class: JHS 3
Term: 1st Term
Week: 12
Grade code: B9.2.3.2.2
Strand code: 2
Sub-strand code: 3
Content standard code: B9.2.3.2
Indicator code: B9.2.3.2.2
Theme: CYCLES
Subtheme: CROP PRODUCTION
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In Ghana, many families depend on crops such as maize, cassava, plantain, tomato, pepper, rice, okro, cocoa and oil palm for food and income. Knowing when a crop is at the right maturity stage helps farmers and consumers to: harvest at the best time (to reduce losses and increase profit), choose crops that fit a purpose (food, seed, animal feed, processing), protect the environment (reduce waste, reduce pests and diseases, reduce chemical use). This lesson focuses on evaluating the importance of knowledge of crop maturity stages and how it supports good decisions in crop production.
2.1 Key terms Crop maturity: The stage of growth when a crop has developed enough for a particular use (eating, processing, storage, seed, etc.). Physiological maturity: The stage when the crop has completed its growth and reached maximum dry matter (often best for seed). Harvest maturity: The stage when the crop is best for harvesting for a specific purpose (may be earlier or later than physiological maturity). Ripening: Changes (especially in fruits) that improve eating quality—sweetness, colour, aroma, softness. Post-harvest losses: Losses after harvesting due to bruising, rotting, pests, poor storage, poor timing, etc. 2.2 Why maturity stages matter (the “importance”) Knowledge of maturity stages is important because it helps to: Meet the intended use (food, seed, processing, animal feed). Increase profit (sell at the stage buyers prefer; avoid rejection). Reduce post-harvest losses (overripe fruits spoil quickly; immature produce shrivels). Improve quality (taste, texture, oil content, starch content, cooking quality). Improve storage life (some crops store better when harvested at a certain stage). Reduce pest/disease problems (overmature crops attract pests; delayed harvest increases field losses). Protect the environment (less waste; fewer chemicals; better use of land and resources).
2.3 Maturity stages and their specific uses (with Ghanaian examples)
Below are common crops and how maturity stage affects use. A. Maize (Zea mays) Main maturity stages and signs Milk stage (early): grains are soft; milky fluid when pressed. Dough stage: grains thicker; dough-like. Physiological maturity / dry stage: husks dry; grains hard; black layer forms at base of kernel; low moisture.
Specific uses Milk stage: roasted/boiled “fresh corn” (street food), sweet taste. Dough stage: can be used for some local dishes but not ideal for storage. Dry stage: Humans: milling into maize flour for banku, kenkey, tuo zaafi. Animals: poultry feed (cracked maize). Seed: best stage for seed selection (fully mature, viable). Environment/other crops: maize stover used as mulch/compost to improve soil organic matter.