X. Guano

Question 1

Minerals that are utilized as fertilizer materials are—

Answer 1

guano, phosphate rock, limestone, dolomite, magnesite, peat, pyrite and sulfur

Question 2

Among the sixteen chemical elements essential for plant growth, ____, _____, and _____ are needed in large amounts. Air and water provide these elements. The rest, supplied by soil, are nitrogen, phosphorus, sulfur, potassium, calcium, magnesium, iron, manganese, zinc, copper, molybdenum, boron and chlorine which are needed in very small quantities.

Answer 2

carbon, hydrogen, and oxygen

Question 3

the accumulated excrement and remains of birds and bats, provide the most important organic source of phosphorus and nitrogen

Answer 3

Guano

Question 4

Under ideal conditions, the rate of deposition of modern guano deposits is as thick as ____ to ___ cm per year.

Answer 4

8 to 10 cm per year

Question 5

In the Philippines, most of the guano deposits are confined to _________ which are the natural habitat or breeding ground of birds (swallows) and bats.

Answer 5

limestone caves and caverns

Question 6

These deposits are light to dark brown, fluffy or feather-like in touch, and show wide variability from average of ____ to ____% in phosphorous pentoxide
content.

Answer 6

1.50 to 36.00%

Question 7

The local guano deposits are classified into:

Answer 7

(1) fresh guano;
(2) phosphatic soil; and
(3) phosphatized guano