Phosphorus Crisis Flashcards

1
Q

What are the 3 major pools of phosphorus?

A
  • Labile P e.g. orthophosphate
  • Complex inorganic P
  • Organic P
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2
Q

How much labile P in soil?

A

0.1-1%

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3
Q

What countries have low levels of labile P and high Fe?

A

Brazil and Australia

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4
Q

How much mined rock phosphate is applied each year?

A

18 million tonnes / year

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5
Q

How much rock phosphate makes 1kg of P?

A

7Kg rock phosphate = 1Kg of P

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6
Q

What can be done to combat the phosphorus crisis?

A

Direct:
- Increase plant P use efficiency
- Reduce reliance on rock phosphate
- Improve recycling of organic P
Indirect:
- Improve crop resistance
- Improve P recovery
- Improve animal P use efficiency

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7
Q

What is the importance of microbes in agriculture?

A
  • Plant growth promotion
  • Plant pathogen suppression
  • Nutrient acquisition
  • Bioremediation
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8
Q

What are the niches in the plant microbiome?

A

Phyllosphere : above ground mass
Rootendosphere : roots
Rhizosphere : zone of chemical, biological, and physical influence around roots

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9
Q

What is rhizodeposition?

A

Process in which plants attract microbes.
Occurs in rhizosphere

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10
Q

How many microbes are there in soil?

A

10^10 - 11 cells per gram of soil

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11
Q

When was the rhizosphere termed?

A

1904

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12
Q

What is different about the early and late research of plant microbiomes?

A

Early: culture dependent
Late: culture independent

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13
Q

What does in situ analysis of gene and enzyme expression in the microbiome allow?

A

Links structure and function to biotic and abiotic conditions

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