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Biosolids Application in the Chihuahuan Desert

Effects on Runoff Water Quality

César M. Rostagno and Ronald E. Sosebee

Dep. of Range, Wildlife, and Fisheries Management, Texas Tech University, Lubbock, TX 79409



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  		Fig. 1. Natural rainfall events and amount during the sampling period (18 July to 17 Oct. 1996), Sierra Blanca, Texas. Arrows correspond to biosolids application date (last application) and start of simulated rainfall on the Stellar and Chilicotal soils, respectively. Dates on the horizontal axis are listed in the month/day/year format

 


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  		Fig. 2. Electrical conductivity (EC) of the runoff water of the Stellar (A) and Chilicotal (B) soils treated 18, 12, 6, and 0.5 mo before the simulated rainfall initiation with 0, 7, 18, 34, and 90 Mg ha-1 of biosolids, Sierra Blanca, Texas

 


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  		Fig. 3. Ammonium N in the runoff water of the Stellar (A) and Chilicotal (B) soils treated 18, 12, 6, and 0.5 mo before the simulated rainfall initiation with 0, 7, 18, 34, and 90 Mg ha-1 of biosolids, Sierra Blanca, Texas

 


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  		Fig. 4. Orthophosphate concentration in the runoff water of the Stellar and Chilicotal soils in the plot treated 18, 12, 6, and 0.5 mo before the simulated rainfall initiation with 90 Mg ha-1 of biosolids, Sierra Blanca, Texas. Pairs of columns with the same lowercase letters were not significantly (P >= 0.05) different

 




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