Nutrient Element Excess and Imbalances Common

Today, most hydroponic growers are more frequently dealing with nutrient element excesses and imbalances rather than individual elemental deficiencies. Those who select a NPK nutrient element fertilizer that does not contain about equal contents of N and K, and P at about 20% of the NK content, are likely to have plant nutritional problems. In addition, the use factors, volume applied with each application and frequency of applications, associated with a particular nutrient solution formulation can lead to nutrient element insufficiencies. A good rule of thumb is that with an increase in either volume applied and frequency of application, the elemental content of a nutrient solution should be decreased, the extent of dilution being determined by experimentation and nutrient element monitoring of the growing plant. Those who would add supplements to their nutrient solution to boost plant growth or flowering, or to increase product yield and quality, run the risk of doing the opposite. Also, those who would add “organic-based” supplements, run the risk of significant decrease in plant growth as well as adversely affecting the nutritional status of the plant.

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Dr. J. Benton Jones has written extensively on the topics of soil fertility and plant nutrition over his professional career. After obtaining a B.S. degree in Agricultural Science from the University of Illinois, he served on active duty in the U.S. Navy for two years. After discharge from active duty, he entered graduate school, obtaining M.S. and Ph.D. degrees from the Pennsylvania State University in agronomy. For 10 years, Dr. Jones held the position as research professor at the Ohio Agricultural Research and Development Center (OARDC) in Wooster. During this time, his research activities focused on the relationship between soil fertility and plant nutrition. In 1967, he established the Ohio Plant Analysis Laboratory. Joining the University of Georgia faculty in 1968, Dr. Jones designed and had built the Soil and Plant Analysis Service Laboratory building for the Georgia Cooperative Extension Service, serving as its Director for 4 years. During the period from 1972 and his retirement in 1989, Dr. Jones held various research and administrative positions at the University of Georgia. Following retirement, he and a colleague established Micro-Macro Laboratory in Athens, Georgia, a laboratory providing analytical services for the assay of soils and plant tissues as well as water, fertilizers, and other similar agricultural substances. Dr. Jones was the first President of the Soil and Plant Analysis Council and then served as its Secretary-Treasurer for a number of years. He established two international scientific journals, "Communications in Soil Science and Plant Analysis" and the "Journal of Plant Nutrition", serving as their Executive Editors during the early years of publication. Dr. Jones is considered an authority on applied plant physiology and the use of analytical methods for assessing the nutrient element status of rooting media and plants as a means for ensuring plant nutrient element sufficiency in both soil and soilless crop production settings.

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