Abstract
In California’s water-seeded rice systems, algal/cyanobacterial biomass can be a problem during rice establishment and can lead to yield reductions. Laboratory, enclosure, and field-scale experiments were established to evaluate the effects of fertilizer P management on algal/cyanobacterial growth. Two field-scale experiments evaluated the response of algal/cyanobacterial growth to three P management strategies: conventional surface applied, incorporated into the soil, and delaying P applications by 30 days. Results from these experiments indicated rice fields that received conventional surface-applied P fertilizer had 4–8 times more algal/cyanobacterial biomass and 3–11 times higher concentrations of soluble reactive phosphate (SRP) than those in which P fertilizer was incorporated or delayed. Laboratory experiments evaluated the ability of field water to support growth of Nostoc spongiaeforme. Results indicate that water from the incorporated or delayed P application fields was P limited for N. spongiaeforme growth. Water from the surface-applied fields was not P limited. Enclosure experiments evaluated the effects of delayed P applications on algal/cyanobacterial biomass and rice yields. Algal/cyanobacterial cover and biomass increased in enclosures which received added P. Soluble reactive phosphate concentrations were also significantly greater in these enclosures. Delaying the application by up to 28 days did not reduce rice yields in the enclosures. One management implication is that reducing SRP concentrations early in the season in rice field water will result in reduced algal/cyanobacterial biomass. Strategies to reduce water SRP include incorporating fertilizer P or delaying the P application by up to 30 days.
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Acknowledgments
We appreciate the comments of Tom Lanini, Merle Anders, Randall Mutters, and Ray Carruthers who read a previous version of this manuscript. G. Ksander and P.-S. Liow provided technical assistance. R. Hornyack, R. Jenkins, and S. Carter were instrumental in the field-scale experiments. Statistical advice was provided by L. Whitehand, USDA Biometrical Service, Albany, California. This work was supported in part by a grant from the California Rice Research Board. Mention of a manufacturer does not constitute a warranty or guarantee of the product by the US Department of Agriculture nor an endorsement over other products not mentioned.
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Spencer, D.F., Linquist, B.A. Reducing rice field algae and cyanobacteria abundance by altering phosphorus fertilizer applications. Paddy Water Environ 12, 147–154 (2014). https://doi.org/10.1007/s10333-013-0370-6
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DOI: https://doi.org/10.1007/s10333-013-0370-6