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What is meant by legumes, and similar plants, “fixing “ nitrogen in soil?
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- Soil 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.How do Biofertilisers enrich the fertility of soil? How does cyanobacteria acts as biofertiliser?Why is nitrogen fixation so energetically costly?
- How do the nitrogen fixers help in fixing Nitrogen for the plant?Why is nitrogen important to living things? What type of organism is responsible for making nitrogen available to plants?Micronutrient deficiency is, or may be:Group of answer choices A.) pH dependent B.) affected by excess macro and secondary nutrients. C.) Is not as typical in acidic soil environments as in alkaline soil environments. D.) All of the above
- How do soil bacteria and mycorrhizae contribute to plantnutrition?Organisms which synthesise their own food are called: A) autotrophs B) heterotrophs C) auxotrophs D) saprotrophsHow would green manure and soil microorganisms work together in enhancing soil fertility and crop yield? Name the targeted element and TWO (2) additional benefits brought by green manures to the soil?
- Available Nutrients occur in the soil generally in the form of:Group of answer choices A.) Ions (cations and anions) B.) Organic complexes C.) Molecular structures D.) Simple sugars.All of the following are true about soil microorganismsEXCEPT:(a) They never affect or change the physical characteristicsof their soil microenvironment.(b) They are considered to be a part of the soil.(c) All major microbial taxonomic groups can be found insoil (bacteria, fungi, algae, protists, viruses).(d) Species of the genus Clostridium contain important hu-man pathogens found in soil.(e) They are important as decomposers in the carbon andnitrogen cycles.Which element is responsible for causing soil salinity?At what concentration does the soil become saline?