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Why is the weathering of bedrock in a New Hampshire forest responsible for such a small fraction of the nutrients available to plants?
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- The practice of crop rotation uses nitrogen fixation to create fertile fields. First, a plant without a nitrogen-fixing relationship, such as corn, is planted. After the harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the nitrogen-fixing plant, however, it is plowed under. The cycle continues in this manner. Which of the following is not an abiotic factor that affects plants being used in crop rotation? a) NH3 availability b) Soil temperature c) Herbivore density d) Oxygen concentrationWhy is the Nitrogen content of Fertilizers so important?The practice of crop rotation uses nitrogen fixation to create fertile fields. First, a plant without a nitrogen-fixing relationship, such as corn, is planted. After the harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the nitrogen-fixing plant, however, it is plowed under. The cycle continues in this manner. Why would nitrogen-fixing plants be plowed under instead of harvested? a) To increases usable nitrogen in the soil. b) To increase water retention. c) Nitrogen-fixing plants are not a food crop. d) To decrease bacteria in the soil.
- Generally, coniferous trees provide softwood lumber, whereas deciduous trees provide hardwood lumber. a) Which type is much more common in Canada’s forests and in Canada’s forest product output? b) Where should you look to find hardwood trees, north or south? Why? c) Name three hardwood species and three softwood species. d) Describe typical uses for softwood lumber and for hardwood lumber.Why do tropical and temperate soils have different rates of nutrient regeneration?Why are total soil concentrations poor indicators of the amounts of ions that may bioaccumulate (enter the food chain)?
- In some circumstances, grasses that initially lose tissues from being consumed by animals such as elk or cattle regrow more than they would have otherwise, and benefit from the moderate levels of grazing. Which of the following terms would best describe such a plant-herbivore interaction?a) Commensalismb) Mutualismc) Predationd) ParasitismWhat process adds water until the water table rises and envelops the deep roots of plants, resulting in a loss of productivity and ultimately killing them? Options A.) Salinization B.) Desertification C.) Soil crosion D.) Overgrazing E.) WaterloggingHow do the nitrogen-fixing genera Azospirillum and Rhizobium associate with plant roots? Rhizobium stays on the outside of the roots of tropical grasses, while Azospirillum grows inside the roots of legumes. Azospirillum and Rhizobium both stay on the outside of roots. Azospirillum stays on the outside of the roots of tropical grasses, while Rhizobium grows inside the roots of legumes. Azospirillum and Rhizobium both grow inside specialized root cells.
- A shortage of phosphorus in the soil would make it difficult for a plant to makeSoil microorganisms, collectively referred to as dizotrophs, fix 90% of the inert nitrogen gas to ammonium and nitrate. There are two-main types of nitrogen-fixing bacteria: free-living (nonsymbiotic) and mutualistic (symbiotic). Describe the mutualistic relationship between Rhizobium and legumes. What is the advantage of using legumes as a cover crop in agricultural systems? A point of interest is that the nitrogenase enzyme complex is highly sensitive to oxygen. This is a major problem for free-living aerobic species such as cyanobacteria and species of the genera Azotobacter and Beiigrinckia. Describe two ways the bacteria can overcome to levels of oxygen in their cells.The practice of crop rotation uses nitrogen fixation to create fertile fields. First, a plant without a nitrogen-fixing relationship, such as corn, is planted. After the harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the nitrogen-fixing plant, however, it is plowed under. The cycle continues in this manner. Crop rotation would allow the farmer to reduce which of the following? a) Planting seeds. b) Watering the fields. c) The use of manufactured fertilizer. d) The burning of fossil fuels by farm equipment.