Journal
AGRICULTURE-BASEL
Volume 10, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/agriculture10070264
Keywords
Solanum tuberosum L.; total potato yield; soil pH; potato marketable yield
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Funding
- Maine Department of Agriculture program of USDA, Specialty Crop Block Grant [201703055]
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Phosphorus (P) is an element that is potatoes require in large amounts. Soil pH is a crucial factor impacting phosphorus availability in potato production. This study was conducted to evaluate the influence of P application rates on the P efficiency for tuber yield, specific gravity, and P uptake. Additionally, the relationship between soil pH and total potato tuber yield was determined. Six rates of P fertilization (0-280 kg P ha(-1)) were applied at twelve different sites across Northern Maine. Yield parameters were not responsive to P application rates. However, regression analysis showed that soil pH was significantly correlated with total potato tuber yield(R-2=0.38). Sites with soil pH values < 6 had total tuber yields, marketable tuber yields, tuber numbers per plant, and total tuber mean weights that were all higher than these same parameters at sites with soil pH >= 6. All sites with soil pH< 6 showed a highly correlated relationship between P uptake and petiole dry weight (R-2=0.76). The P application rate of 56 kg P ha(-1)was the best at sites with a soil pH < 6, but 0-56 kg P ha(-1)was the best at sites with soil pH >= 6.
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