Yield and Composition of Sweet Pearl Millet as Affected by Row Spacing and Seeding Rate
- Audrey Boucharda,
- Anne Vanasse *a,
- Philippe Seguinb and
- Gilles Bélangerc
- a Département de phytologie, Université Laval, Québec, QC, Canada G1V 0A6
b Dep. of Plant Science, McGill Univ., Macdonald Campus, 21111 Lakeshore Rd., Sainte-Anne-de-Bellevue, QC, Canada H9X 3V9
c Soils and Crops Research and Development Centre, Agriculture and Agri-Food Canada, 2560 Hochelaga Blvd, Québec, QC, Canada G1V 2J3
Sweet pearl millet [Pennisetum glaucum (L.) R. BR.] seems promising for ethanol production, but optimal cropping practices are unknown for the cool and humid conditions of eastern Canada. We evaluated the effects of two row spacings (18 and 36 cm) and four seeding rates (5, 10, 15, and 20 kg ha−1) on biomass dry matter (DM) yield, water soluble carbohydrate (WSC) concentration and yield, and nutritive value of sweet pearl millet at two sites in Québec, Canada. Increasing seeding rates decreased biomass DM and WSC yields at Sainte-Anne-de-Bellevue but had a limited effect at Saint-Augustin-de-Desmaures. Hence, a seeding rate of 5 kg ha−1 resulted in maximum biomass DM (12.4–19.1 Mg ha−1) and WSC (1.56–2.64 Mg ha−1) yields. Row spacing did not affect biomass DM and WSC yields at Saint-Augustin-de-Desmaures but biomass DM yield was greater at a row spacing of 18 cm at Sainte-Anne-de-Bellevue. The WSC concentrations in leaves and stems were inconsistently affected by seeding rate but were not affected by row spacing. The WSC concentrations were greater in stems (140.7–162.4 g kg−1 DM) than in leaves (35.7–48.1 g kg−1 DM). Increasing the seeding rate generally decreased N concentrations of leaves and stems and digestibility of neutral detergent fiber (NDF) but increased concentrations of acid detergent fiber and NDF. Row spacing did not affect any nutritive value attributes. Seeding at 5 kg ha−1 with a row spacing of 18 cm maximize biomass and WSC yield with minimal effect on forage nutritive value of sweet pearl millet.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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