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Fluid Journal : Fluid Journal 1993-1995
1 Fluid Journal Summer 1994 Summary: While firm conclusions cannot be drawn at this time, foliar application of KNO3 appears to offer some potential for supplementing preplant soil applications of potassium fertilizer. However, results of a Beltwide study (1991-1993) have been variable and somewhat inconsistent. It is clear that additional research will be required to better understand the physiological aspects of plant K requirements and soil buffering capacity. Widespread outbreaks of potassium (K) deficiency across the Cotton Belt in recent years have focused attention on the possible use of foliar fertilization with K. However, the results that producers have experienced using foliar K have been somewhat inconsistent. Preliminary research in 1989 in Arkansas indicated that foliar applications of KNO3 can increase yield and lint quality. More recently, a three- year Beltwide K study (1991-1993) was started to better understand the K deficiency syndrome and how to ameliorate it. The cooperative effort included researchers and sites in Arkansas (Dr. Oosterhuis and Mr. Janes), Missouri (Drs. Albers and Tracy), Alabama (Drs. Mullins and Burmiester), Arizona (Dr. Silvertooth), California (Dr. Weir and Mr. Roberts), Louisiana (Dr. Hutchinson), Georgia (Drs. Hodges and Carter), Mississippi (Dr. Ebelhar), North Carolina (Drs. Guthrie and Edmisten), Tennessee (Dr. Howard), Texas (Drs. Cothren and Hickey), and Virginia (Dr. Abaye). Although the results were variable, with significant yield differences about 40 per-cent of the time, improved understanding of the problem and its possible solutions has resulted. It has been speculated that the outbreaks of K deficiencies in the Cotton Belt are related to the use of by Dr. Derrick M. Oosterhuis Foliar Fertilization of K On Cotton Shows Potential Results of three-year Beltwide study to correct K deficiencies in soil through fo- liar fertilization indicate need for more basic research. high-yielding, early-maturing, faster- fruiting cotton cultivars. These deficiencies cannot always be corrected through soil applications of K. Thus the search for an alternative, as already mentioned. Foliar-applied K may offer the opportunity of correcting these deficiencies more quickly and efficiently. Foliar applications have the advantage of allowing producers to add the necessary K when tissue analysis indicates a pending shortage, thereby arresting the deficiency and preventing yield loss. There have been numerous Figure 1. Mean of seed cotton yields averaged over sites for foliar potassium studies in 12 Cotton Belt states, 1991-1993. 2,100 Control Low Soil K High Soil K Low Soil K + Foliar K High Soil K + Foliar K 2,200 2,300 2,400 2,500 2,600 2,700 2,800 2,900 3,000 3,100 3,200 3,300 3,400 Yield (lbs/A) 1991 1992 1993 Mean
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