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The Balance Sheet Method as a Conceptual Framework for Nitrogen Fertilization of Wheat in a Pampean Agroecosystem

^a Facultad de Agronomía, Univ. de Buenos Aires, Av. San Martín 4453 (1417), Buenos Aires, Argentina
^b EEA Pergamino INTA, CC 31 (2700), Pergamino, Argentina

View larger version (20K): [in a new window]   Fig. 1. (A) Aboveground biomass and (B) yield of wheat as a function of N in the crop.

View larger version (17K): [in a new window]   Fig. 2. Relationships (A) between observed and estimated values for N factor and (B) between N concentration in grain and N factor. For definition of variables, see Table 1.

View larger version (16K): [in a new window]   Fig. 3. (A) Changes in soil mineral N content during the growing season as a function of initial mineral N level and (B) relationship between N crop and N crop + NMH. For definition of variables, see Table 1.

View larger version (18K): [in a new window]   Fig. 4. (A) Observed vs. predicted N liberated from decomposing plant residues and (B) observed vs. predicted N apparently produced by mineralization from the soil organic matter. For definition of variables, see Table 1.

View larger version (23K): [in a new window]   Fig. 5. Diagram of the model developed to predict wheat yield in the Pampean agroecosystem. For definition of variables, see Table 1.

View larger version (16K): [in a new window]   Fig. 6. Relationship between observed vs. predicted (A) N crop and (B) yield. For definition of variables, see Table 1.

View larger version (20K): [in a new window]   Fig. 7. Agronomic efficiency as function of initial mineral N content of the soil for a typical rainfall scenario and three soil mineralization capacity levels. For definition of variables, see Table 1.