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 3 3 3 3 factorial distributed in a splitsplit 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.

quality forage during the 3 to 4 mo of reduced forage production. Over the last two decades an increase in the The effects of three different grazing pressures on beef (Bos taurus) cropping area devoted to grain production has gradually and wheat (Triticum aestivum L.) grain production were studied at Pasman (Argentina) during a 3-yr study. Thirty hectares of the variety replaced pasturelands. Currently, owing to low profits 'Pincen' wheat were grazed with Angus heifers during 3 yr (1995)(1996)(1997) from grain crops, many farmers are attempting to reuntil apex differentiation. The different grazing pressures were obbuild their cattle stocks. Crops for grain and pastures tained through different stocking rates, adjusted every 21 d according compete for land use and make it more difficult to return to forage mass, predicted forage production rate, and an estimated to livestock production. forage allowance of 10, 15 and 20 kg dry matter (DM) heifer Ϫ1 d Ϫ1 The use of wheat as a forage and grain dual-purpose for high, medium, and low pressures, respectively. The three treat-(DP) crop is aimed at reducing competition between ments were randomly allocated within a complete block design with areas devoted to grain and forage crops. The income two replications. Every 21 d forage samples were clipped and forage stability of this system should be higher because both mass and plant composition were recorded and in vitro dry matter beef and wheat commodities are available for market digestibility (IVDMD), crude protein (CP), and neutral detergent fiber (NDF) were determined. Spike density and grain production

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