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Fluid Journal : Fluid Journal 1996-1998
3 Fluid Journal Fall 1998 1997. Fertilizer sources for foliar applications conducted in the San Joaquin Valley included: • ESP K Sulfate • Mora Leaf P&K • Fulcrum • KNO3 • KTS ESP K Sulfate produced increased yields as rates were increased. No phytotoxicity or other problems were evidenced. Mora Leaf P&K performed similarly. Yields increased on both Acala and Pima cottons, although there were no significant differences among the treatment means. Fulcrum increased yields most when it was applied early in the season. Applications after squaring or flowering resulted in less lint than the untreated control. This is the only material that has given a positive response to early applications. Potassium nitrate rates were increased over tests of previous years. High rates resulted in better yields than standard low rates. KTS, tested as a supplemental foliar fertilizer for the past two years, yielded positive results. Slight phytotoxicity on plant leaves was noted when high rates of material were used. The crop quickly outgrew the symptoms. Summary Foliar K fertilization of cotton has proven to be an important management tool for high-yielding cotton varieties in the San Joaquin Valley. Late-season K deficiencies produced by high K demand of heavy boll loads from high- yielding varieties can cut yields and profits if not met with supplemental K. California research has shown that timing is critical in meeting these additional K needs. Success with K foliar fertilization suggests that other nutrient needs may also be addressed by foliar fertilization. Additional research is continuing in that area. Dr. Weir is professor University of California Cooperative Extension.
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