Growing tomatoes under generated light or supplemental lighting in a greenhouse? What are the light intensity and spectrum characteristics of the lights being used? You need to know if the cost for generating that light is going to be recovered by increased yield of high quality fruit. Remember that tomato varieties are breed and selected under a particular set of lighting conditions, so what were those conditions? A particular variety may not be positively responsive to the light conditions under which your tomato plants are being grown, even under natural sunlight due to the greenhouse glazing, whether glass, polyethylene sheeting, or a polycarbonate panels which have different light-transmitting characteristics? Tomato plant growth characteristics will be different under these various light-transmitting properties as well as added supplemental lighting. What may be given in the catalog as the growth and yield characteristics of a particular variety may not be obtained. If not, then your light conditions may be reason. Therefore, it may take testing on your part to find that tomato variety which will give you the fruit yield and quality desired. Good hunting.
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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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