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1. Soil Test Interpretation: Saturated Paste, EC, SAR and CECSoils of neutral to alkaline pH of the Western United States often contain elevated levels of soluble salts and / or higher concentrations of sodium. Elevated concentrations of soluble salts limit crop growth and sodium may impact water management. Competent agricultural management of these soils is dependent on laboratory analysis of: soil soluble salts and there composition and the irrigation water soluble salt constituents. Soil analysis based on the saturated... R. Miller |
2. Biological and Chemical Drivers of Nutrient Dynamics in the Rhizosphere: Applications for Crop ManagementThe rhizosphere (soil volume around plant roots) is a "hot spot" of plant-microbe- soil interactions, and biological and chemical dynamics in this region play a large role in plant access and uptake of nutrients. Crop plants can influence these dynamics in the rhizosphere to facilitate availability and uptake of nutrients, and can form symbiotic or antagonistic relationships with rhizosphere soil microbes, who either facilitate or compete with plants for nutrient... N. Tautges |
3. Reliability of Soil and Plant Analyses for Making Nutrient RecommendationsNutrient management is dependent on the collection of soil and plant samples for analytical testing and assessment. The quality of the analytical test are subject to bias and precision of the measurements made by the testing laboratory. Failure to understand lab analyses uncertainty can lead to over confidence in the management recommendation. Test uncertainty varies by soil and plant test methods utilized and by performance capability of the testing laboratory. Generally soil methods that provide... R. Miller |
4. Evaluation of N Uptake Analysis As a Tool for Determing Potato N StatusPlant tissue testing has become the primary method for evaluating nitrogen availability for potatoes during the growing season. This study was conducted to determine if plant N uptake rates referenced to absorbed solar radiation could also be used as a tool to quantitatively assess plant N status of different potato varieties. Nitrogen fertilizer, as NH4NO3 (34-0-0), was applied to Russet Burbank, Gem Russet, Bannock Russet and Summit Russet at three rates (0, 100, or 300 kg N/ha) using two... J. Stark, S. Love, C. Mcintosh |