Office of Overseas Programming & Training Support (OPATS) Agriculture Gardens Training Package Session 7: Supplemental Fertilization.

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Presentation transcript:

Office of Overseas Programming & Training Support (OPATS) Agriculture Gardens Training Package Session 7: Supplemental Fertilization

As seedlings grow and develop they constantly draw down the available nutrients in the soil. Plant root Soil particles (organic matter and clay) with attached nutrients Supplemental Fertilization

Provides a needed nutritional boost that produces stronger stems and healthier leaves Flowering to Fruit Set “Generative Stage” Transplanting to Flowering “Vegetative Stage” Supplemental Fertilization

Primary Soil Nutrients  Nitrogen (N): promotes stem and leaf growth  Phosphorous (P): promotes strong roots and fruit development  Potassium (K) or potash: increases a plant’s resistance to disease, heat, and drought Supplemental Fertilization

Organic Fertilizers  Water-soluble nutrient sources derived from previously living (i.e., organic), often decomposed, matter.  Tend to be cheap and easily obtainable from on-farm resources.  Are low impact and improve soil quality rather than damaging it. Supplemental Fertilization

Sources of organic fertilizers:  Nitrogen: chicken manure, dead fish, dried blood and bone meal, cotton seed meal, leaves from leguminous plants and trees, etc.  Phosphorous: raw/steamed bone meal, egg shells, chicken manure, banana and citrus skins, dried blood, cotton seed meal, etc.  Potassium: wood ash, banana waste, charred and ground corn cobs, etc. Supplemental Fertilization

Other forms of organic fertilizer that can be given to a garden as a supplemental fertilizer:  Manure tea  Compost extract  Seaweed tea (where appropriate) Supplemental Fertilization

Uses for manure tea  Leaf crops (e.g., lettuce, cabbages) can take a weekly application of manure tea.  Fruit crops (e.g., tomatoes, eggplants, peppers) need to be treated once every two weeks.  Root crops and legumes require only one application of manure tea during their growing season. Supplemental Fertilization

Inorganic fertilizers  Industrially-manufactured chemical formulations that deliver exact amounts of N, P, K, and micronutrients to the soil. Supplemental Fertilization

Benefits of supplemental fertilization with inorganic fertilizers  Concentrations of N, P, and K are known and much higher (i.e., more concentrated) than what is found in organic fertilizer.  Less fertilizer is required with more NPK readily available for quick uptake by the plants, with resulting yields typically higher. Supplemental Fertilization

Disadvantages of inorganic fertilizers  Requirement for finite resources (e.g., fossil fuel, mined phosphates) raising questions of sustainability  Tend to be costly and not readily available  Long-term decrease in soil organic content  Water pollution from soluble nitrogen Supplemental Fertilization