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Interpretive Summaries:
1999 - Evaluation of Potassium Source and Rate of Starter Fertilizer on No-Till Corn and Cotton
1998 - Evaluation of Potassium Sulfate as a Starter Material for No-Till Corn and Cotton
1997 - Evaluation of Potassium Sulfate as a Starter Material for No-Till Corn and Cotton
Evaluation of Potassium Source and Rate of Starter Fertilizer on No-Till Corn and Cotton, 1999
Research, which began in 1997, was continued in 1999 at Milan on a Memphis silt loam to determine the no-till corn and no-till cotton response to fertilizer solutions made from K2SO4 or KCl, with and without 11-37-0 plus UAN solutions as in-furrow (IF) starters.
Application of 10-10-10 IF, using K2SO4 as the K source, increased 1997 corn yields 18 bu/A over the 108 bu/A check and 24 bu/A over the IF starter which included K as KCl. Reducing the starters to 5-5-5 solutions resulted in comparable yields with both K sources, which were not different from the 10-10-10 solution made with K2SO4. No significant differences in corn yield were measured among starter treatments in 1998, possibly because of very high temperatures during silking through maturation. No-till corn yields (102 to129 bu/A) were not significantly affected by IF starter in 1999. No differences in cotton yield among treatments were detected in either 1997 or 1998. In-furrow application of 4-4-4 using K2SO4 resulted in 75 lb/A more lint cotton (848 lb/A) compared to the next closest yield and 100 lb/A more lint than the control in 1999. Cotton leaf and petiole P and K analyses failed to show any differences among treatments in 1999. TN-13F
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