Monopotassium phosphate as an in-season fertigation option for potato
2010
Hopkins, Bryan G. | Ellsworth, Jason W. | Shiffler, Amanda K. | Cook, Aaron G. | Bowen, Thomas R.
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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