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Production Papers

Effect of Planting Date, Clipping Height, and Cultivar on Forage and Grain Yield of Winter Wheat in Argentinean Pampas

^a Campo Experimetal de Coronel Suárez, Ministerio de Asuntos Agrarios de la Provincia de Buenos Aires, Argentina
^b (current address: Instituto Nacional de Tecnología Agropecuaria, Jujuy 850, (4200) Santiago del Estero, Argentina)
^c Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina, Departamento de Agronomía, Universidad Nacional del Sur, San Andrés 800, Bahía Blanca-8000, Argentina, and Centro de Recursos Naturales de Zonas Semiáridas (CERZOS-CONICET), Universidad Nacional del Sur, Bahía Blanca-8000, Argentina

^* Corresponding author (jarroquy{at}intasgo.gov.ar)

Received for publication November 17, 2005. In Argentinean Pampas, new wheat (Triticum aestivum L.) cultivars are routinely introduced to farmers for dual-purpose production. The objective of this study was to evaluate the effect of planting date, clipping height on forage, and grain yield for wheat cultivars. Treatments were arranged as a 3 x 3 x 3 factorial distributed in a split-split plot within a randomized complete block design. Main plots were planting date (March, April, and May); split-plots were clipping height (3 cm, 7 cm, and no clipping); and split-split plots were a facultative cultivar Pincen, and two nonfacultative cultivars Charrua and Bordenave 223 (Bve223). In 1995 and 1996 forage yield decreased in response to a delayed planting date from March to May, whereas in 1997 it was not affected by planting date. The 3-cm clipping height yielded 21% more forage than plots clipped at 7 cm. Bve223 and Charrua produced significantly more forage than Pincen each year. Grain yield increased as planting date progressed from March to May. Clipping at 3 cm reduced grain yield compared with no clipping, while during 2 to 3 yr, 7 cm produced no significant change in grain yield compared with no clipping. In all years Bve223 produced more grain than Charrua or Pincen. Forage yield lost in response to later planting date ranged between 0 and 81% during the 3 yr; whereas grain yield increased from 40 to 190% for wheat planted in May compared with March. In conclusion, dual-purpose wheat planted during April had both good forage and grain production, and its success was influenced by cultivars.

Abbreviations: ADF, acid detergent fiber • CP, crude protein • DM, dry matter • IVDMD, in vitro dry matter digestibility • NDF, neutral detergent fiber