The fluctuation of nitrate nitrogen content in luvisols
1999
Vanek, V. | Nemecek, R. | Balik, J. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic))
Seasonal changes of NO3-N content were studied at six arable fields. Luvisols, show mild acid or neutral pH and sufficient supply of P, K and Mg. Average annual rate of N per ha applied in fertilizers for growing crops for the eight year period was 102 kg N for winter cereals, 47 kg N for spring cereals, 107 kg N for sugar beet and 187 kg N for cabbage. Soil NO3-N content showed relatively stable values during the whole investigated period. In soil samples taken up in autumn after the harvest of winter as well as spring cereals nitrate was kept on the level about 15 ppm N and after the harvest of sugar beet and cabbage about 10 ppm N. Deviations from these values, found in certain years, are probably caused by different hydrothermic conditions. Aerobic incubation increased NO3-N content up to about 30 ppm N in samples taken up after the harvest of the crops. In spring period higher values after sugar beet were recorded and lower values of nitrate N were found after growing of cabbage and spring cereals. Higher increase of mineralizable N content (higher nitrate content after incubation) was mostly caused by manure application.
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