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Articles by Mathieu Ngouajio
Total Records ( 2 ) for Mathieu Ngouajio
  Dieudonne N. Baributsa , Eunice F. Foster , Kurt D. Thelen , Alexandra N. Kravchenko , Dale R. Mutch and Mathieu Ngouajio
  The increasing cost of nitrogen fertilizer and the need for a N source for low-input and organic farmers have led to the increased exploration of legume cover crops as an alternative to N fertilization. Reliable cropping strategies are needed to enhance legume cover crop use as a N source. Interseeding legume cover crops into corn (Zea mays L.) can affect corn yield and cover crop dry matter. This study, conducted at the Kellogg Biological Station in Hickory Corners, MI, from 2002 to 2005, evaluated (i) the impact of interseeded cover crops on corn yield at various corn densities (37,500 to 75,000 plants ha–1) and (ii) the effect of corn density on cover crop dry matter (DM) when corn was interseeded with red clover (Trifolium pratense L.) or chickling vetch (Lathyrus sativus L., var. AC Greenfix). Interseeded cover crops did not affect corn yield at any corn density. Interseeded cover crop DM decreased as corn density increased. The subsequent spring, red clover DM was similar regardless of previous corn density; AC Greenfix did not regrow. Interseeded cover crops produced less DM than monoculture cover crops. Cover crops can be interseeded into corn densities up to 75,000 plants ha–1 without corn yield reduction and still produce substantial DM the subsequent spring. Interseeding corn with red clover could be used in low-input farming systems to reduce N fertilizer costs, especially in developing countries and in organic farming systems.
  Guangyao Wang , Mathieu Ngouajio , Milton E. McGiffen and Chad M. Hutchinson
  Cover crops are widely used in both conventional and organic systems to protect and improve the soil. This study evaluated the effect of summer cover crop and management system on the production of fall romaine lettuce (Lactuca sativa L.) and spring cantaloupe (Cucumis melo L.) from 1999 to 2003. Cover crop treatments included cowpea [Vigna unguiculata (L.) Walp.] incorporated (CPI), cowpea used as mulch (CPM), sudangrass [Sorghum bicolor (L.) Moench] incorporated (SGI), and a bare ground control (BG). The management system treatments included conventional (CON), integrated crop management (ICM), and organic (ORG). The CPM and SGI increased soil organic matter content and changed the soil N profile. Soil organic matter was higher and nitrate leaching was lower in the ORG system. The CPM plots had less weed growth during the lettuce crop, but higher weed biomass during the cantaloupe crop in the first year. During the cantaloupe season, weed biomass in the ORG increased over years relative to the CON system. The CPI plots had the highest lettuce yield in the first 2 yr, while SGI and CPI had higher cantaloupe yield. Lettuce yield in the ORG system increased over years relative to the CON system, but cantaloupe yield in the ORG system was lower in all four seasons. This study showed that cover crops could be used to improve cropping systems and that the soil and plants previously under long-term conventional system changed significantly during organic transition.
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