Potato Yield and Tuber Quality Did Not Respond to Phosphorus Fertilization of Soils Testing High in Phosphorus Content

Abstract

<jats:p>Phosphorus (P) fertilization studies were conducted on four commercial farms and at the University of Florida Institute of Food and Agricultural Sciences Hastings Research and Education Center in Hastings. All sites were in the potato (<jats:italic>Solanum tuberosum</jats:italic>) production area of northeastern Florida. Preplant Mehlich-1 soil test P was very low at one commercial site and very high at the other four sites. The yield of marketable size A tubers, the desired tuber category, did not respond to P fertilization from 0 to 66 lb/acre (74.0 kg·ha<jats:sup>-1</jats:sup>) of P at any site. The average yield across all sites was 324 cwt/acre [16.2 ton/acre (36.3 t·ha<jats:sup>-1</jats:sup>)]. Leaf-P concentration at midseason did not respond to P fertilization. Leaf-P concentration averaged 0.38%, which was sufficient for potato. Potato tuber specific gravity averaged 1.075 and responded slightly to P fertilization only at one site.</jats:p>

Testing of Controlled Release Fertilizer Programs for Seep Irrigated Irish Potato Production

“…As expected, plants in all N treatments produced significantly higher potato yield than plants in the no N treatment. [10] This research demonstrated that CRFs can be used effectively for potato production without tuber yield or quality loss. The trends between treatments for total yield were similar in marketable yield as well ( Table 3).…”

“…Soils in the TCAA are high in extractable phosphorus requiring a P application of 34 kg ha À1 or less. [2,10] All leaf K levels were within the sufficient range (3.5-6.0%) for Florida production except for the 168 and 224 kg N ha À1 AN þ urea treatments (T3 and T4). Yet, all these values were within the sufficiency range for potato.…”

Nutrient Uptake and Removal by Potato Cultivars as Affected by Phosphate Fertilization of Soils with Different Levels of Phosphorus Availability

“…The increase in fresh tuber yield and tuber DM yield up to the rates of 500, 250, and 125 kg ha -1 P 2 O 5 in soils with low, medium, and high initial P availability, respectively, indicates that at high soil P availability, there is no need to apply high P rates to potato (Figures 5a and 5b). Other studies have indicated no increase and/or only small increases in potato tuber yield in response to the application of high P rates in soils with high initial P availability (Rykbost et al, 1993;Hochmuth et al, 2002;Rosen and Bierman, 2008;Luz et al, 2013;Rosen et al, 2014;Fernandes and Soratto, 2016). However, Brazilian producers still commonly apply rates higher than 600 kg ha -1 P 2 O 5 in potato-growing areas (Sangoi and Kruse, 1994;Fernandes et al, 2011).…”

Improving Nitrogen and Phosphorus Efficiency for Optimal Plant Growth and Yield

“…About 5% of soil samples had more than 56 kgha −1 of P, and 10% were P deficient. There may have been a steady build-up of P in the soil over the years ( [116,117]) due to steady P application. In 2016, 85% of the soil samples were found to have a higher range of P in comparison to ~70% in 1996.…”