engleski

Impact of precipitation upon nitrate leaching and crop yield at different pipe drainage spacing

The goal of three-year investigations was to determine the influence of precipitation upon drainage discharge and its duration, concentration of nitrates in drainage water, amount of nitrates leached and yields of crop grown: winter wheat, oilseed rape and soybean, at four different pipe drainage spacings (15 m, 20 m, 25 m and 30 m) on hydroameliorated siol. Research results show that drainage discharge and its duration dependend on the amount and distribution of precipitation during the study period. The highest nitrate concentration in drainage water, in all pipe spacing variants, was recorded with the occurrence of the first drainage discharges and was higher than 10 mg/L NO3-N. The amount of nitrates leached, in each year and at each pipe spacing, dependend on the drainage discharge and nitrate concentration in drainage water. Effect of pipe drainage in crop yields and draining surplus water from soil was positive in humid years whiel no effect of pipe drainage was recorded in the dry year.

Precipitation; pipe spacing; drainage discharge; nitrate leaching; crop yield

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