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Integrated Management of Inorganic and Organic Nitrogen and Efficiency in Potato Systems

Department of Crop and Soil Sciences, Michigan State Univ., W.K. Kellogg Biological Station, East Lansing, MI 48824-1325

View larger version (51K): [in this window] [in a new window]   Fig. 1. Potato tuber yield in container-grown plants amended with organic N sources, in the presence and absence of inorganic N fertilizer (adjusted to 224 kg N ha–1 availability from organic and inorganic N sources); least square means ± standard errors. Treatments with different letters are statistically different at P < 0.05.

View larger version (34K): [in this window] [in a new window]   Fig. 2. Nitrate-N dynamics monitored using an anion exchange membrane at two depths in the container experiment. Means are reported for NO3–N monitored every 15 d from membranes inserted initially 10 d after planting. Error bars are standard errors of means.

View larger version (38K): [in this window] [in a new window]   Fig. 3. Light-fraction organic matter from the 0- to 20-cm depth measured in the container experiment at harvest; mean and standard errors reported for weight and C and N content of the light fraction. Treatments with different letters are statistically different at P < 0.05.