Plant-Substrate Relations 1. What do these initial questions suggest about the ecological significance of plant-substrate relations? a. A pathogen-free plant growing on a sandy soil is chlorotic, as compared to other plants growing on a calcareous loam. What does chlorotic mean, and why might that be consequential? b. Why might an herbivore prefer and be more productive feeding on younger forage rather than senescent forage? c. A rancher expressed concern about grazing his/her livestock on rangeland with seleniferous soils and abundant milk vetches. Why? d. Another cattle producer was hesitant to feed forage from a recently nitrogen-fertilized site that had then been hit by an unusually early frost. Why? e. Soil testing revealed an area to have adequate nutrient levels as well as a high electrical conductivity and low water potential. Is that combination of any concern, and what might it suggest? f. How might soil conditions compare between an area of native tall grass prairie and a nearby area with a century-old
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