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Timing of Nitrogen Fertilization in Wheat under Conventional and No-Tillage System

Mariana A. Melaj*,a, Hernán E. Echeverríab, Silvia C. Lópeza, Guillermo Studdertb, Fernando Andradeb and Néstor O. Bárbaroa

a Agronomic Section, Comisión Nacional de Energía Atómica, Av. del Libertador 8250, Capital Federal, República Argentina
b Unidad Integrada INTA-FCA Balcarce, C.C. 276, 7620 Balcarce, República Argentina



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  		Fig. 1. Mean (a) air temperature and (b) growing degree days (GDD) during wheat 1998 and 1999 growing seasons. EE, ear emergence; A, anthesis; EM, early milk; SD, soft dough; PM, physiological maturity.

 


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  		Fig. 2. Soil water content at 0- to 40-cm depth along wheat growing season, under no-tillage (NT) and conventional tillage (CT), in 1998 and 1999. EE 99, ear emergence in 1999; A 98, anthesis in 1998; PM 98 and PM 99, physiological maturity (1998 and 1999, respectively).

 


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  		Fig. 3. Available N as nitrate (NO3–N) in soil at 0- to 40-cm depth in (a) 1998 and (b) 1999 at sowing (S), anthesis (A) or ear emergence (EE), and physiological maturity (PM) under no-tillage (NT) and conventional tillage (CT). 0 = 0 kg N ha-1; 120S = 120 kg N ha-1 at sowing; 120T = 120 kg N ha-1 at tillering.

 




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