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- W1510996835 abstract "The investigations of the tile drain water composition in areas with aclayey soil consisted of taking two or more samples of drain water at 30farms in the sea-clay regions of the Netherlands from 1992 to 1995. Thedrain-water composition was used to describe the significant effects ofthe weather (precipitation minus evapotranspiration) and the distributionof travel times in the soil on the drain-water composition. The effectof nitrate leaching from arable land (and orchards) provided with tiledrains assumed linear relationships with the N load, depending on thetexture of the soil (sand, loam, clay) and groundwater depth (Gt). The Nleaching was 10% to 25% of the load for deep-water levels, after takinginto account a possible reduction by the oxidation of sulfide compounds,or the occurrence of seepage water in drain discharge. The leaching ofnitrate from grassland is generally less than from arable land. Reducedleaching was also observed after growing grass seedlings on arable landin the year before sampling. The leaching from grassland is a functionof the load (after subtracting uptake by vegetation), of the soil typeand of groundwater depth. The leaching of phosphate in clay regions hasno direct relationship to surface loading, yet the crops grown differed. Phosphate concentrations in drain water discharged from arable land hadrelatively constant values of 0.10 mg.l-1 (as ortho-P). Leaching fromrecent grassland was roughly 0.20 mg.l-1 (as ortho-P), while leachingfrom older permanent meadows had a relatively high value of 0.40 mg.l-1 (as ortho-P) and greater. The number of cases investigated was too smallto make significant conclusions on phosphate leaching fromgrassland." @default.
- W1510996835 created "2016-06-24" @default.
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- W1510996835 date "1997-11-30" @default.
- W1510996835 modified "2023-09-23" @default.
- W1510996835 title "Onderzoek aan drainwater in de kleigebieden vanNederland; Deel II: Interpretatie van de gegevens" @default.
- W1510996835 hasPublicationYear "1997" @default.
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