Graphite, soapstone, dolomite, rock phosphate, limestone and a variety of marbles are mined in the region, with some deposits of gold found around Jagpura.
22.
Unless systems change, shortages of rock phosphate could lead to shortages of inorganic fertiliser, which could in turn affect crop growth and cause starvation.
23.
Even so, a fertiliser called the " Christmas Island rock phosphate " had been used to rehabilitate the soil before the planting was begun.
24.
Hard rock phosphate : Slow-release source that is rich in calcium; more readily available in acid conditions, so not always the best for alkaline soil.
25.
However, scientists estimate that rock phosphate reserves will be depleted in 50 100 years and that " Peak Phosphate " will occur in about 2030.
26.
Superphosphates can be used as a source of phosphate, or if a natural source is preferred, finely-ground rock phosphate or blood and bone may be used.
27.
As with the timing of peak oil, the question is not settled, and researchers in different fields regularly publish different estimates of the rock phosphate reserves.
28.
Microorganisms produce organic acids, which cause the slow dissolution of phosphorus from rock phosphate dust added to the soil, allowing more phosphorus uptake by the plant roots.
29.
The world consumes around 140 million tons of high grade rock phosphate mineral today, 90 % of which goes into the production of diammonium phosphate ( DAP ).
30.
He said the process which involved piling up dry padi stalks and layering them with lime, urea, rock phosphate and water was a simple one requiring little cost.
