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The effects of an agropastoral system on the production of soybean and wheat were investigated by comparing (from 2007 to 2009) agropastoral plots that had been reconverted from 4-year pasture (Guinea grass: Panicum maximum; 2003 to 2007) to crop cultivation, with control plots that had been continuously cropped over 13 years with soybean and wheat at CETAPAR-JICA. In 2003, Guinea grass pastures were converted from 10-year continuous cultivated soybean and wheat fields, and then grazed intensively from 2004 to 2007, while the control plots continued to be cultivated with soybean and wheat. Animal production in converted pastures was very high and the weight gain per hectare was 1,113 to 1,500 kg/ha over 3 years after introducing an intensive grazing system with supplemental feeding in dry season. The average daily gain was maintained at 0.554 to 0.621 kg/head/day despite a high stocking rate (4.5-6.0 UA/ha). However, after the reconversion in 2007, the soybean yields from 2008 to 2009 were 3.71 and 1.24 ton/ha, which were 1.02 and 1.43 times higher than those in the control plots, respectively. In 2008, the wheat yield was 2.72 ton/ha, the same as that in the control plots. Thus, we concluded that the agropastoral effects on the soybean and wheat yield were small after reconversion to intensive grazing. The reason for the small effect is likely to be the low supply of Guinea grass litter under high grazing pressure, which did not result in any accumulation of the organic matter in the soil.

jarq/jarq. japan agricultural research quarterly

Evaluation of an Agropastoral System Introduced into Soybean Fields in Paraguay: Effects on Soybean and Animal Production under Intensive Grazing Systems