Water quality improvements in the Upper North Bosque River watershed due to phosphorous export through turfgrass sod

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Title: Water quality improvements in the Upper North Bosque River watershed due to phosphorous export through turfgrass sod
Author: Stewart, George Russell
Abstract: The Upper North Bosque River (UNBR ) watershed is under a Total Maximum Daily Load (TMDL ) mandate to reduce Phosphorus (P ) due to excess nutrients in the watershed . To address these problems , Texas A &M University researchers have developed a turfgrass sod Best Management Practice (BMP ) to remove excess nutrients from impaired watersheds . Turfgrass harvest of manure fertilized sod removes a thin layer of topsoil with most of the manure applied P . Plot and field scale research has demonstrated the effectiveness of turfgrass to remove manure phosphorus (P ) . In order to assess the impact of the turfgrass BMP on a watershed scale , the Soil and Water Assessment Tool (SWAT ) was used to predict water quality in the UNBR watershed . The SWAT model was modified to incorporate turfgrass harvest routines to predict manure and soil P export through turfgrass sod and soil during harvest . SWAT simulations of the BMP predicted stream load reductions of 20 to 36 % for P loads in the UNBR depending on the implementation scenario , an average reduction of 31 % for total N and 16 .7 % for sediment for all the scenarios , at the watershed outlet . The SWAT model also predicted up to 176 kg /ha P removed per sod harvest when fertilized with 100 kg manure P /ha , and 258 kg /ha of P removed per sod harvest when the manure P application rate was 200 kg /ha . In addition , depending on the implementation scenario , the turfgrass BMP could export between 262 and 784 metric tons of P out of the UNBR watershed every year . Manure fertilized turfgrass has the advantage of slow releasing nutrients from the composted dairy manure , so it would not require any additional P for life . This means reduced urban non -point source pollution and lower maintenance cost compared to regular sod . These modeling simulations complement the wealth of research that shows the effectiveness of the turfgrass BMP .
URI: http : / /hdl .handle .net /1969 .1 /1428
Date: 2005-02-17

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Water quality improvements in the Upper North Bosque River watershed due to phosphorous export through turfgrass sod. Available electronically from http : / /hdl .handle .net /1969 .1 /1428 .

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