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Publication Date
1985
Location
Kyoto Japan
Description
We conducted studies which assessed soil phosphorus (P) status and responses to P fertilization in five pasture types of varying longevity. The main objective was to determine if current recommendations for P fertilizer on pastures, as based on P fertilization response studies in ungrazed small-plot studies, are suitable. In two of the five pasture types, soil P was at levels such that yield response from applied P was insignificant. Plant tissue P concentration was increased but was not a good indicator of P fertility needs. Soil P was both concentrated in areas of the pasture extending to 30 m from watering sites and in the upper 0-75 mm of the soil. We concluded that pasture studies where P fertility initially is non-limiting can not be used to derive practical recommendations any more suitably than can the rates of P fertilization deemed optimal in ungrazed small-plot studies. We suggest periodic sampling for soil test P along with P fertility response studies within pastures as a procedure to more accurately assess P fertility levels in research studies which compare with on-the-farm conditions.
Citation
Wedin, W F.; Mallarino, A P.; Gregory, M S.; West, C P.; and Voss, R D., "Varying Phosphorus Fertilization with Pasture Type and Longevity" (1985). IGC Proceedings (1985-2023). 18.
(URL: https://uknowledge.uky.edu/igc/1985/ses6/18)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Varying Phosphorus Fertilization with Pasture Type and Longevity
Kyoto Japan
We conducted studies which assessed soil phosphorus (P) status and responses to P fertilization in five pasture types of varying longevity. The main objective was to determine if current recommendations for P fertilizer on pastures, as based on P fertilization response studies in ungrazed small-plot studies, are suitable. In two of the five pasture types, soil P was at levels such that yield response from applied P was insignificant. Plant tissue P concentration was increased but was not a good indicator of P fertility needs. Soil P was both concentrated in areas of the pasture extending to 30 m from watering sites and in the upper 0-75 mm of the soil. We concluded that pasture studies where P fertility initially is non-limiting can not be used to derive practical recommendations any more suitably than can the rates of P fertilization deemed optimal in ungrazed small-plot studies. We suggest periodic sampling for soil test P along with P fertility response studies within pastures as a procedure to more accurately assess P fertility levels in research studies which compare with on-the-farm conditions.
