Graduate Thesis Or Dissertation
 

Nitrate-nitrogen accumulation in the surface soil during the fallow period under different precipitation levels and tillage systems

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  • The effects of different fallow moisture levels and tillage systems on the amount of nitrate-nitrogen accumulation in the 0-30 cm soil profile were studied. Fallow moisture treatments simulating typical dry, normal and wet precipitation cycles were established on trial plots. Data were obtained for nitrate-nitrogen, soil moisture and nitrogen mineralization potential. Dry, normal and wet fallow moisture treatments had no effect on nitrate-nitrogen accumulation in the 0-30 cm soil depth. The nitratenitrogen accumulation rate after August was 2-3 times higher than the other periods. This is an important consideration for nitrogen fertilizer application. Fallow tillage treatments consisting of bare fallow, stubble mulch and no-till were established on trial plots. Data were obtained for nitrate-nitrogen, soil temperature, soil moisture and nitrogen mineralization potential. The location of the crop residue as a result of tillage treatment affected the rate of the nitrate-nitrogen accumulation during the various sampling intervals. Spring rains and rewetting the soil surface by rain during September created more favorable conditions for no-till systems. Adequate moisture under the mulch during the summer stimulated the nitrate-nitrogen accumulation under the bare fallow systems. The amount of mineral nitrogen obtained by a calculation procedure and measurement in fallow plots were compared during two fallow periods. The calculation procedure consistently produced higher values than the field measurements but the two values were always proportionate.
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