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Optimization of Liquid Swine Manure Sidedress Rate and Method for Grain Corn

^a Agric. & Agri-Food Canada, Southern Crop Protection & Food Res. Cent., 1391 Sandford St., London, ON, Canada N5V 4T3
^b Agric. & Agri-Food Canada, Southern Crop Protection & Food Res. Cent., Delhi, ON, Canada, N4B 2W9

View larger version (29K): [in a new window]   Fig. 1. Yearly comparisons of plot- (by manual harvesting) and field- (by combine yield monitor) scale corn grain yield following sidedress of liquid swine manure with different rates and methods. r = correlation coefficient.

View larger version (119K): [in a new window]   Fig. 2. Corn growth response to injected (INJ) or topdressed (TD) liquid swine manure sidedressed at different rates (m3 ha–1) on (A) 18 July 2001 and (B) 23 July 2002.

View larger version (15K): [in a new window]   Fig. 3. Corn grain yield response to injected (INJ) or topdressed (TD) liquid swine manure (LSM) sidedressed at 0, 37.4, or 56.1 m3 ha–1, average of 1999–2002 plot-scale data. Means with the same letter are not significantly different at the 0.05 probability level.

View larger version (28K): [in a new window]   Fig. 4. Corn grain yield response curves to sidedress injection rate of liquid swine manure (LSM) from 1999 to 2002. Yields are adjusted for presidedress topsoil NO3 concentration. Large symbols represent the rate required for 95% maximum yield for plot- (colored symbol) and field- (gray symbol) scale data sets. Solid and dashed lines represent quadratic fits for plot- and field-scale yields, respectively.