| Popis: |
Nitrogen from three sources—(NH4)2SO4, Ca(NO3)2, NH4OH—was applied to four irrigated soils during a five-year lysimeter experiment. Effects on yields, irrigation water used, salinity of soil and drainage water, and soil acidity were studied. Gains or losses of other elements were also recorded. Yields of Swiss chard and corn were not affected by the (NH4)2SO4, Ca(NO3)2, and NH4OH materials, but the Ca(NO3)2 resulted in higher nitrogen content of plants. The (NH4)2SO4 acidified the soil, caused higher losses of Ca in the drainage water of one soil, and produced higher total salt in all soils. The Ca(NO3)2 and NH4OH materials produced similar effects. The Ca in Ca(NO3)2 was largely precipitated. |
