Improving Phosphorus Management on Irrigated Potato
Assessed the effect of phosphorus management on potato yield and quality under Manitoba’s irrigated production systems.
IPNI-2003-CAN-MB19
16 Feb 2006
2005 Annual Interpretive Summary
Improving Phosphorus Management on Irrigated Potato, 2005
A field experiment was conducted at one location near Carberry in 2005 to assess the effect of four P rates (0, 30, 60, 90 lb P2O5/A as broadcast/incorporated monoammonium phosphate) on tuber yield and quality, petiole P status, and post-harvest soil P status. The experimental site selected had a spring soil test P level of 15 parts per million (ppm) Olsen P which would have resulted in a recommendation for P fertilizer. In 2005, total tuber yield was considerably higher than in previous years of the study, averaging 463 cwt/A. Preliminary analysis indicated that increasing P fertilizer rate resulted in a linear increase both in total tuber yield and in the yield of tubers greater than 12 oz. While the yield of small and maingrade tubers was not affected by fertilizer treatments, bonus tuber yield increased linearly with increasing P fertilizer rate. Phosphorus fertilizer application appeared to have little effect on quality parameters including specific gravity, fry color, sugar ends, and yield losses due to hollow heart and brown center. MB-19F