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Tillage and Nitrogen Source and Rate Effects on Corn Response in Corn–Soybean Rotation

Dep. of Agronomy, Iowa State Univ., Ames, IA 50010-1010

View larger version (26K): [in a new window]   Fig. 1. Corn grain yield as a function of N rate of liquid swine manure (LM) and commercial fertilizer N (CF) under no-tillage (NT), strip tillage (ST), and chisel plow (CP) systems at Nashua, IA: (a) LM in 2002, (b) CF in 2002, (c) LM in 2003, (d) CF in 2003, (e) LM in 2004, and (f) CF in 2004. Error bars represent ±1 SE.

View larger version (16K): [in a new window]   Fig. 2. Relative corn grain yield averaged across 3 yr and three tillage systems as a function of N rate of liquid swine manure (LM) and commercial fertilizer N (CF). Error bars represent ±1 SE.

View larger version (19K): [in a new window]   Fig. 3. Corn grain yield averaged across 3 yr and across all tillage systems as a function of N rate of liquid swine manure (LM) and commercial fertilizer N (CF or commercial). Points of maximum (MNR) and economic optimum (EONR) N rates and maximum (MGY) and economic optimum (EOGY) grain yields are shown. Error bars represent ±1 SE.