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1 June 2011 Processing tomato phosphorus utilization and post-harvest soil profile phosphorus as affected by phosphorus and potassium additions and drip irrigation
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Abstract

Liu, K., Zhang, T. Q. and Tan, C. S. 2011. Processing tomato phosphorus utilization and post-harvest soil profile phosphorus as affected by phosphorus and potassium additions and drip irrigation. Can. J. Soil Sci. Sci. 91: 417-425. Phosphorus (P) applied in agricultural land not only affects crop P utilization, but can also cause environmental concerns when excessive P applied moves off-site to surrounding water systems. A 2-yr study, 2007-2008, was conducted to determine the effects of fertilizer P (four rates: 0, 30, 60, and 90 kg P ha-1) and potassium (K) (four rates: 0, 200, 400, and 600 kg K ha-1) additions and drip irrigation on crop P utilization and post-harvest agronomic (i.e., Olsen P) and environmental [i.e., water extractable P (WEP)] soil test P under processing tomato in loamy sand soils. Plant P uptake increased, but apparent P recovery decreased with increases in fertilizer P rate. Cumulative soil WEP in the 0- to 100-cm soil profile and Olsen P in the 0- to 20-cm depth increased linearly with increases in fertilizer P rate, regardless of water management. No effects of K were found on plant P utilization, soil WEP, or soil Olsen P. Drip irrigation increased plant P uptake by 35% and apparent P recovery by 44%, relative to non-irrigation. Drip irrigation consequently decreased the post-harvest soil profile WEP by 14% and Olsen P by 6.5% averaged across the 2 yr, compared with non-irrigation. Drip irrigation reduced the potential for post-harvest soil P losses by improving P utilization. the addition of fertilizer P needs to be optimized by considering crop P needs in association with actual yield production to ensure processing tomatoes are produced in an environmentally sustainable manner.

K. Liu, T. Q. Zhang, and C. S. Tan "Processing tomato phosphorus utilization and post-harvest soil profile phosphorus as affected by phosphorus and potassium additions and drip irrigation," Canadian Journal of Soil Science 91(3), 417-425, (1 June 2011). https://doi.org/10.1139/CJSS09098
Received: 22 October 2009; Accepted: 1 May 2010; Published: 1 June 2011
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