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
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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.
