Question

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Answer 1

Answer:

1) Sources of soil nutrient include:

Organic matter decomposition.

Precipitation.

Biological nitrogen fixation.

Inorganic fertilizer application.

2) soil microorganisms play an essential role in decomposing organic matter, cycling nutrients and fertilising the soil. ... Soil microbes are of prime importance in this process. Soil microbes are also important for the development of healthy soil structure

3) cyanobacteria (or blue-green algae) Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium

4) When the nutrient level is too low, the plant cannot function properly and produce the food necessary to feed the worlds' population. Once crops are harvested for human consumption, the natural supply of nutrients in the soil must be “re-filled”. This is why farmers add nutrients to their soils.

5)the waste from farm animals, used to make plants grow better

is the accumulated excrement of seabirds and bats. As a manure, guano is a highly effective fertilizer due to its exceptionally high content of nitrogen, phosphate and potassium: key nutrients essential for plant growth. Guano was also, to a lesser extent, sought for the production of gunpowder and other explosive materials.

6)

Answer 2

Answer:

Answers :-

1. nitrogen (N) and phosphorus (P) .

2. The role of microorganisms present in air is to decompose the organic matter to make the soil more fertile. They also develop healthy soil structure.

3. Azotobacter and Rhizobium bacteria.

4. It becomes essential for farmers to add additional fertilizers to the soil because when the soil loses its nitrogen compounds called nitrates then the soil becomes nitrogen deficient. then the farmers refill the nitrogen compounds, so that the plants can make the proteins from nitrogen gas.

5. The waste from farm animals which is used to make plants grow better is called muck.

6. the waste substance passed from the bodies of seabirds, that is used by farmers to make plants grow well is called Guano.

It is rich in nitrogen, phosphate and potassium.

7. In the form of Ammonia.

8. Nitrogen and phosphorus.

Hope it helps you....

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