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The 1st 12 years of a long term crop rotation study in southwestern saskatchewan canada nitrate nitrogen distribution in soil and nitrogen uptake by the plant


The 1st 12 years of a long term crop rotation study in southwestern saskatchewan canada nitrate nitrogen distribution in soil and nitrogen uptake by the plant



Canadian Journal of Soil Science 63(3): 563-578



ISSN/ISBN: 0008-4271

The distribution of NO3-N in the soil, and N uptake by the crop during the first 12 yr of a long-term rotation [including wheat, flax, hay oat, rye and fallow] study at Swift Current, Saskatchewan were studied. A considerable amount of NO3-N appeared to be leached beyond the rooting zone of the cereal crop in years of above average precipitation and also in some relatively dry years with heavy spring rains. Thus, leaching of NO3-N seemed to occur even under continuous wheat rotations. At all times there was considerable NO3-N situated at the 60- to 120-cm depth. In wet years N uptake by the plants reduced the amount of NO3-N located in the subsoil, but in dry years the amount of NO3-N located in the subsoil, but in dry years the amount of NO3-N in the subsoil remained higher throughout the growing season. The latter could result in groundwater pollution, especially if such a soil was fallowed the next year. Fall rye (Secale cereale L.) made more efficient use of mineral N than spring-sown crops. In dry years more NO3-N persisted in the root zone of N-fertilized wheat than in the root zone of unfertilized wheat, but in wet and average years there was little difference due to N application. The average rate of net NO3-N production in fallow land from spring thaw to freeze-up (166 days) was 107 kg/ha. Values ranged from about 60-175 kg/ha with the lowest values being obtained during very dry or very wet years. The quantity of N mineralized (kg/ha) between spring thaw and freeze-up was related to precipitation (mm) by the equation Nmin = 29.0 + 0.20 precipitation for the 0- to 60-cm depth (R2 = 0.65*).

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