HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Related articles in JEQ Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (17) Citing Articles via Google Scholar Google Scholar Articles by DeLaune, P. B. Articles by Daniel, T. C. Search for Related Content PubMed PubMed Citation Articles by DeLaune, P. B. Articles by Daniel, T. C. Agricola Articles by DeLaune, P. B. Articles by Daniel, T. C. Related Collections Watershed and Landscape Processes Surface Water Quality Phosphorus Nutrient Management Animal Waste

Evaluation of the Phosphorus Source Component in the Phosphorus Index for Pastures

^a Department of Biological and Agricultural Engineering, University of Arkansas, Fayetteville, AR 72701
^b Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72701
^c USDA-ARS, Poultry Production and Product Safety Research Unit, Fayetteville, AR 72701
^d USDA-NRCS, National Water Management Center, Little Rock, AR 72203
^e USDA-ARS, Pasture Systems and Watershed Management Research Unit, University Park, PA 16802

View larger version (24K): [in a new window]   Fig. 1. Relationship between (a) average soluble reactive phosphorus (SRP) in runoff from three runoff events before litter application and Mehlich-III P; (b) average SRP in runoff from three runoff events after litter application and Mehlich-III P; and (c) average SRP in runoff from three runoff events after litter application and the amount of soluble P applied. Soil test P (Mehlich-III) was measured after Events 1–3, before litter application. (Small plot, simulated runoff events.)

View larger version (21K): [in a new window]   Fig. 2. Relationship between average soluble reactive phosphorus (SRP) in runoff water from six runoff events (three events before litter application, three events after litter application) and (a) Mehlich-III P and (b) the P index. (Small plot, simulated runoff events.)

View larger version (24K): [in a new window]   Fig. 3. Relationship between average soluble reactive phosphorus (SRP) in runoff and the P index from plots receiving poultry litter applications (dashed line) and plots receiving no poultry litter applications (solid line). (Small plot, simulated runoff events.)

View larger version (22K): [in a new window]   Fig. 4. Relationship between the P index and measured annual P loss from two 0.405-ha watersheds receiving natural rainfall and annual poultry litter applications. The P index was calculated annually based on annual litter application rate and soluble P concentration, soil test P concentration, and transport potential (0.8).