Uptake of mineral nitrogen from subsoil by winter wheat
Haberle, J.(Vyzkumny Ustav Rostlinne Vyroby, Prague (Czech Republic)) E-mail:[email protected] | Svoboda, P.(Vyzkumny Ustav Rostlinne Vyroby, Prague (Czech Republic)) | Krejcova, J.(Vyzkumny Ustav Rostlinne Vyroby, Prague (Czech Republic))
The apparent uptake of mineral nitrogen (Nmin) from top- and subsoil layers during the growth of winter wheat was studied in Prague (Czech Republic) on clay loam Chernozem soil during the years 1996-2003. Two (N0, N1) and three treatments, unfertilized (N0), fertilized with 100 kg (N1) and 200 kg (N2) N per hectare were observed in the years 1996-2000 and 2001-2003, respectively. The apparent uptake of N from soil layers was calculated from the changes of Nmin content between sampling terms. Most of the available Nmin in the soil down to 90 cm was almost fully depleted between tillering and anthesis in treatment N0. The uptake from subsoil layers was delayed and it continued during the period of grain filling in fertilized treatments. N fertilization reduced N utilization from subsoil. The apparent uptake of N from the zone 50-120 cm ranged from 21 to 62 kg N/ha in N0 and from 15 to 60 kg N/ha in N1 in the years 1996-2000. In the years 2001-2003 the corresponding values (50-130 cm) were 24-104 kg, 43-130 kg and 29-94 kg N/ha in treatments N0, N1 and N2, respectively. The uptake from 120 (130)-150 cm reached at maximum 12 kg/ha but was often around zero. There was a strong linear relation between the amount of Nmin in spring and the depletion of N from the zone 50-130 cm.
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