Poster Number 283
See more from this Division: A08 Integrated Agricultural Systems
See more from this Session: Crop Management (Posters)
Abstract:
Grain production of all crops was greatly influenced by year, which provided significantly different environments including precipitation, temperature, and diseases pressure, except sunflower and field pea which had relatively consistent yields through out the study period. Oil content ingrain tended to be affected by year more than grain protein content. The year affect had a similar pattern on all crops biomass production as well. Tillage system had a significant impact on grain yield, but not grain quality. In general, grain yields of all crops were significantly lower in the no-till system than the conventional- and minimum-tillage systems. The exception was soybean which had a significantly higher yield in no the no-tillage system than the conventional- and minimum-tillage systems. Biomass production had a similar pattern to grain yield and grain quality was not affected by tillage system. Grain and biomass yields of non-legume crops responded to increased N fertilization up to 90 kg/ha except hard red spring wheat, which had the highest yield at 45 kg/ha and manure application had similar affects as chemical nitrogen fertilizer application on grain and biomass yield. Soil quality parameters were significantly changed by tillage systems and fertilization. This study shows that crop rotations with more three or more different crop types did not have a negative impact on soil quality. Soil organic matter and phosphorous at the 0 to 15.24 cm depth was highest in the not-till system and soil nitrogen at the 0 to 15.24 cm depth was not different among tillage systems. However, soil nitrogen at the 30.48 to 60.96 cm and 60.96 to 121.92 cm depths were significantly lower in the no-till system. Higher soil nitrogen in the subsurface soil was associated with increased nitrogen fertilization. These results show the potential for nitrogen leaching with increased fertilization and tillage. Manure application based on N rate increased both soil organic matter and phosphorous in the soil surface.
See more from this Division: A08 Integrated Agricultural Systems
See more from this Session: Crop Management (Posters)