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| Filter results3 paper(s) found. |
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1. Do Soil Nitrogen Tests Relate to Nitrogen Mineralization in First-year Corn Following Alfalfa?Corn (Zea mays L.) is the most frequent first-year crop grown following alfalfa (Medicago sativa L.) in the Upper Midwest. In the majority of cases, first-year corn does not respond to fertilizer N, but sometimes large amounts are needed to optimize yield. The pre-sidedress and Illinois soil N tests (PSNT and ISNT, respectively) are early-season tests used to predict corn yield response to fertilizer N. These tests measure specific fractions of soil N and define a critical concentration to separate... |
2. Switchgrass Response to Nitrogen: Trade-offs between Quantity and QualityIn 2009 and 2010, a study was conducted at four loca tions in southwest Wisconsin to determine optimal nitrogen (N) fertilizer rates and harvest timings for switchgrass quantity and quality. The study was conducted as a randomized complete bloc k, split plot design with five main plot treatments (0, 56, 112, 168, and 224 kg ha -1 of N) and three split plot treatments (mid-fall, late- fall, and early spring harvest). Dry matter (D M) yields increased between 2009 and 2010 and were most often maximized... |
3. Soil Carbon Additions Improve Soil Nutrient Cycling and Yield of CornIncreasing soil organic matter and the associated soil carbon is known to positively influence nutrient cycling, and agronomic practices such as conservation tillage and cover crops can facilitate soil carbon increases in the long term. Alternatively, the direct addition of carbon amendments to the soil may serve as an alternative solution for enhancing nutrient cycling in the short-term, which was the basis for this research. Our objective was to assess the potential of granular carbon amendments... D. Danzl, D. Below, D. Sible |