Economics of Site-Specific Nitrogen Management for Protein Content in Wheat

BONGIOVANNI, R.; ROBLEDO, C.W.; LAMBERT, D.M.

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2007 vol. 58 p. 13 - 13

heat fields in the semiarid region of Argentina are spatially variable in soil nitrogen (N) fertility and crop productivity. By accounting for spatial variation in soil N levels, variable-rate fertilizer application may improve crop yield, protein content, and N use efficiency within fields. Therefore, there is interest in applying variable rates of N fertilizer across the landscape. The general objectives of this research are to determine relationships among yield, protein and N rates, using spatial regression analysis of yield monitor data; and to optimize variable-rate application (VRA) of nitrogen fertilizer for wheat. The data were drawn from an on-farm N trial of 10.2 ha within a 44 ha field conducted in Manfredi, Córdoba, Argentina, in 2003. The experimental design was a complete block strip trial that included two different types of soils in terms of landscape (Hilltop and Lowland) and two different antecessor crops (Corn and Soybeans). The fertilized strips were wider than th