1.-T or F Bio-available N is commonly the most limiting nutrient in terrestrial
ID: 119970 • Letter: 1
Question
1.-T or F Bio-available N is commonly the most limiting nutrient in terrestrial ecosystems.
2.-T or F Acid soils can result in greater solubility of many transition metal species.
3.-T or F Potassium in mica interlayers is plant-available and easily leached
4.-T or F The Phosphorus forms in the atmosphere are an important source of Phosphorus inputs into soils and terrestrial ecosystems.
5.-T or F Reduced forms of metals such as Fe2+ and Mn2+ tend to be more soluble than oxidized forms found in soils.
6.-T or F Plant macronutrients are less concentrated in animal manures than in manufactured fertilizers.
7.-T or F Most soil K+ is found in insoluble minerals and non-expanding clay interlayers
Explanation / Answer
1. Bio-available N is commonly the most limiting nutrient in terrestrial ecosystems.
Answer: TRUE
Explanation: Generally growth of plants in terrestrial ecosystems is often limited by the availability of nitrogen(N) and phosphorus (P). Because both of these are considered as limiting plant growth in most ecosystems.
2. Acid soils can result in greater solubility of many transition metal species.
Answer: FALSE
Explanation: Soil acidification will have a major impact on agricultural productivity and sustainable farming systems. Soil acidity can decrease the availability of essential nutrients and Increase the impact of toxic elements.
3. Potassium in mica interlayers is plant-available and easily leached.
Answer: FALSE
Explanation: The nutrients present in the layered silicate structure of mica are not easily accessible to plants because they are non-exchangeable to the soil solution. Basically micas consists of two tetrahedral sheets and this is the reason why K in most soils is not leached easily.
4. The Phosphorus forms in the atmosphere are an important source of Phosphorus inputs into soils and terrestrial ecosystems.
Answer: TRUE
Explanation: Deposition of dust particles from the atmosphere also can bring phosphorus into terrestrial ecosystems. In some cases weathering of soil and parent rocks are the other major reasons for introduction of phosphorus to a terrestrial ecosystem.
5. Reduced forms of metals such as Fe2+ and Mn2+ tend to be more soluble than oxidized forms found in soils.
Answer: TRUE
Explanation: Yes the reduced forms of ferrous iron Fe2+ and manganese Mn2+ are much more soluble than oxidized forms found in soils.
6. Plant macronutrients are less concentrated in animal manures than in manufactured fertilizers.
Answer: TRUE
Explanation: Plants do require 13 nutrients and they cannot distinguish between an organic or synthetic fertilizer. The nutrient content of organic fertilizer varies greatly among source materials and readily degradable materials make better nutrient sources.
7. Most soil K+ is found in insoluble minerals and non-expanding clay interlayers
Answer: FALSE
Explanation: Depending on the type of soil and environmental conditions, potassium availability in plants may vary. Because oxygen levels are also important for uptake of potassium by plants.
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