Objectives of the Guidelines To explain how mineral fertilizers should be used to supplement existing soil fertility levels in meeting plant nutrient requirements. To restore and maintain soil fertility levels for long-term soil productivity by proper use of mineral fertilizers. To show how nutrient losses, both by erosion and to groundwater, can be minimized with sound fertilizer management. To promote economic crop production and environmental protection through the use of best agricultural practices. To create public awareness and to provide planners, policy-makers and other leadership with an understanding of the critical role of mineral fertilizers in sustaining agricultural production.
Crops require an adequate supply of nutrients.
Sufficient fertilizer should be applied to meet crop needs. Proper balance is also required to produce optimum yields, while protecting the environment. Promotion of more extensive root systems, increasing nutrient and water uptake for higher yields, and holding the soil in place against wind and water erosion, Providing a quicker canopy cover, exposing more leaf area to sunlight to increase photosynthesis, and covering the soil surface, reducing the erosive impact of rainfall, Supporting the production of more residue, above and below ground, to build soil organic matter and nutrient reserves and to stabilize the soil, Improving water use efficiency of the growing crop, Increasing crop resistance to stresses such as drought, pests, heat and cold. Use of mineral fertilizers to supplement soil fertility is an ideal method of ensuring that crop nutrient requirements are met and the environment protected. Mineral fertilizers are relatively easy and efficient to transport and can be stored without risk to the environment.