Effects of the time of application and the form of nitrogen on two maize inbred lines seed yield
2005
Hojka, Z.
The study was carried out in the experimental field of the Maize Research Institute Zemun Polje, Belgrade - Zemun, Serbia, on calcareous chernozem during the period of 2001-2003. The trials of two maize inbred lines (L1 - FAO 400, and L2 - FAO 600) were observed in dependence on the time of the nitrogen application (No - control withour fertilizing; Nautumn - 60 kg P2O5/ha and 60 kg K2O/ha applied in autumn (const.) + 100 kg N/ha) applied in autumn); Nspring - PK (const.) + 100 kg N/ha (applied in spring); N1/2 - PK (const.) + 100 kg N/ha (half of which was applied in autumn and the other half in spring); N1/3 - PK (const.) + 100 kg N/ha (1/3 of which was applied in autumn, 1/3 in spring and 1/3 through soil dressing); Nmin - PK (const.) + fertilising in spring on the basis of the Nmin method, and forms of applied nitrogen: urea (amide form), KAN (ammonium-nitrate form) and (NH4)2SO4 (ammonium form). The highest average yield was obtained by the use of Nmin method (3,486 kg/ha), as well as, 100 kg N/ha applied in spring (Nspring) (3,337 kg/ha), 100 kg N/ha applied in autumn and spring (N1/2) (3,020 kg/ha), and 100 kg N/ha applied in autumn, spring and soil dressing (N1/3) (3,005 kg/ha) in ammonium-nitrate form (KAN). The highest average seed yield of observed maize inbred lines (3,264 kg/ha) was obtained by the application of ammonium-sulphate in the primary tillage (Nautumn). The use of the Nmin method (N ranging from 17 to 35 kg/ha, in dependence on the soil mineral nitrogen content), especially in years with lower precipitation sums, resulted in the highest increase in seed yield (39.2) of observed maize inbred lines in relation to the control.
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