MONOPOTASSIUM PHOSPHATE AS AN IN-SEASON FERTIGATION OPTION FOR POTATO |
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| Authors: | Bryan G. Hopkins Jason W. Ellsworth Amanda K. Shiffler Aaron G. Cook Thomas R. Bowen |
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| Affiliation: | 1. Plant and Wildlife Sciences , Brigham Young University , Provo, Utah, USA;2. Wilbur-Ellis Co. , Kennewick, Washington, USA;3. Department of Plant, Soil and Entomological Sciences , University of Idaho , Idaho Falls, Idaho, USA |
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| Abstract: | Monopotassium phosphate (MKP) is a potential option for fertigating phosphorus (P) in potato (Solanum tuberosum L.) when petioles are low in P and high in nitrogen (N); which is a situation where using ammonium polyphosphate (APP) could potentially result in excessive N application. Fertilizer trials were conducted in 2004–2006 with 0 or 56 kg P2O5 ha?1 fertigated as either APP or MKP as a supplement to the pre-plant P (112 or 224 kg P2O5 ha?1) broadcast applied to all plots. Supplemental P fertigation increased petiole P concentration, US No. 1 yield, and total yield over the control not receiving any in-season P fertilizer regardless of source. In addition, MKP increased tuber specific gravity. These results support previous studies showing that fertigated P can be used to increase potato yields when petiole P concentrations are low and that MKP is a viable substitute for APP fertilizer when fertigation is necessary. |
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| Keywords: | monopotassium phosphate MKP nitrogen phosphorus potassium general plant nutrition potato Solanum tuberosum fertigation fertilizers |
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