SELECTED WATER RESOURCES ABSTRACTS 



INPUT TRANSACTION FORM 



Organization 



Dtpertment of Water Rtsouixes 

 San Joaqutn District 

 Fresno, California 



Title 



NUTRIENTS PBOM TILE DRAIKAGE SYSTEMS 



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22 



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Author(s} 



Glandon, Lawrence R. 



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Project Designation 



EPA Project 13030 ELY 05/71 -3 



21 



Note 



U.S. Govemraont Printing Office 

 Washington, D,C. 



Citation 



Bio-Engineering Aspects of Agricultural Drainage 



Pages - 90, Figures - 18, Tables - 29, References - 30 . 



Descriptors (Starred First) 



•Agricultural Waste, 'Tile Drainage, Nutrients, Nitrates, Phosphates, 

 Dtnltriflcation, Fertiliiation, Irrigation Practices 



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Identifiers (Starred Firsts 



•San Joaquin Valley, California, •Composited Drainage, •Nutrient Variability, 

 Indigenous Nutrients, Residual Nitrogen 



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A bs tract 



scharges and nutrient concentrations were calculated for different years, months and areas of 

 ywide. major tiled areas, pfyslo raphic positions and soils). Average nutrient concentrations 

 ,ed drainage from the Valley were fotmd to be 19.3 mgA for nitrogen (NO3-K) and 0.09 ragA 



trations and flows. 



Average dia 

 interest {valley 



in the composited drainage — ^ - . , , ^^ 1* j j_4_.„. 



for phosphoivs (PO,-P), average discharge was 1.4 ac-ft/oc/yr. Nutrt«>t levels in the .omposited drainage 

 did not change appreciably with time. Variability of nutrients was observed for different seasons a twofold 

 decrease in nutrients was attributed to dilution by irrigation and denitrification. N was three times "o^ 

 conc^ntmted in dminage fr^m one out of four n«Jor tiled areas investigated. The hi* N levels were attribute 

 more to indigenous conc.ntrations in certain alluvial fan soils and their parent materials th«n fertilization. 

 Low N levels found in drainage from basin s. lis were b.liev»d caused by danltrlficatlor. P was seven times 

 higher in the d,»ina^e from the southernmost ar.a than th. other areas investigated. These extraordinarily 

 hi^ levels (0.69 m^/l) wer« attriouted to Indigenous concentrations in o.rtain soils made available by 

 anaerobic soil conditions. High discharge in the northernmost area (2.3 ac-ft/a.) was believed to be caused 

 by rapid lateral Vxydraullc conductivity and surrounding irrigation Influence. 



Abstractor 



Lairranc* R. Glandon 



Institution 



Dapartment of Water Rasouroas 



WR;102 (REV JULY 1969) 

 WRSIC 



SEND TO' WATER RESOURCES SCIENTIFIC INFORMATION CENTER 

 U S DEPARTMENT OF THE INTERIOR 

 WASHINGTON. D C 20J40 



OU-S. GOVERNMENT PRINTING OFFICE: 19J2 484-484/142 1-3 



