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Dry Matter Accumulation and Silage Moisture Changes after Silking in Leafy and Dual-Purpose Corn Hybrids

Agriculture and Agri-Food Canada, Eastern Cereal and Oilseed Research Centre (ECORC), Central Experimental Farm, 960 Carling Avenue, Ottawa, ON, Canada K1A 0C6

View larger version (46K): [in a new window]   Fig. 1. Monthly total precipitation and accumulated crop heat units (CHU) during the growing seasons of 1999, 2000, 2001, 2002, and 43-yr average (1960–2002).

View larger version (28K): [in a new window]   Fig. 2. Time taken to progress from 100% milk line to physiological maturity (0% milk line) in four corn hybrids in 4 yr (1999–2002). The horizontal line in each figure indicates the 50% milk line (i.e., the ideal stage for silage harvest). Hybrids Pioneer 37M81, Maizex Leafy 4, and TMF94 were grown in all years while Max 86 used in 1999 and 2000 was replaced with N.K. Enerfeast I (non-Leafy silage corn) in 2001 and 2002.

View larger version (22K): [in a new window]   Fig. 3. Silage dry matter (DM) (Y) accumulation as a function of number of days after silking (DAS; X). Each data point is the average of two densities and four replications. The overall curve was fitted to a quadratic-plus-plateau model: Y = a + bX – cX2 when X < X0, and Y = Ymax when X X0. Hybrids Pioneer 37M81, Maizex Leafy 4, and TMF94 were in common in all years while Max 86 used in 1999 and 2000 was replaced with N.K. Enerfeast I (non-Leafy silage corn) in 2001 and 2002.

View larger version (21K): [in a new window]   Fig. 4. Silage moisture changes as a function of number days after silking (DAS; X). Each data point is the average of two densities and four replications. The overall curve was fitted to a negative exponential decay model: M = M0 e(–kX). Hybrids Pioneer 37M81, Maizex Leafy 4, and TMF94 were in common in all years while Max 86 used in 1999 and 2000 was replaced with N.K. Enerfeast I (non-Leafy silage corn) in 2001 and 2002.