AGRONOMIC NEWS ITEMS
From Agronomists of the
Potash & Phosphate Institute
655 Engineering Drive, Suite 110
Norcross, Georgia 30092-2837
Phone (770) 447-0335
Fall 2005, No. 6
Soil water and air bathe plant roots and help keep them and above-ground plant parts healthy and vigorous. The quality of soil in which plants grow is thus important in determining crop yield potential, profitability, sustainability, and the maintenance of the soil resource for future generations.
Soil quality is not directly measurable; however, there are several indicators that are used in its evaluation. Examples of soil quality indicators are soil organic matter content, and various physical, chemical, and biological properties. Although management practices to enhance soil quality will vary with soil type and other factors, the Natural Resources Conservation Service (NRCS) has listed several principles that apply in most crop production situations.
One of the greatest benefits of complete and balanced crop fertilization, aside from increasing crop yields and improving farmer profit potential, is its effect on soil organic matter. Both organic and inorganic (mineral) fertilizer sources contribute to the buildup of organic matter in soils. There is widespread public misperception that organic agriculture is more environmentally friendly and better maintains soil organic matter levels. However, there is no generally accepted scientific evidence to support the superiority of either organic or inorganic plant nutrient sources. In fact, long-term experiments from around the world indicate that sustained yields and soil productivity can be accomplished with balanced nutrient applications using either animal manures and/or commercially produced mineral fertilizers.
The key, then, is the wise use of fertilizer to boost crop yields, improve farmer profits, and protect the environment. An important part of environmental protection is improved soil quality through the buildup of organic matter, which can be accomplished by balanced nutrient input, regardless of whether organic, mineral, or a combination of the two sources.
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