By G Manju Sainath, DH News Service, Bangalore: The violent and tragic twist to the shortage of fertilisers in the State claimed the lives of two farmers to police firing. As a possible answer to the fertiliser shortage, an agriculture scientist has suggested an effective substitute to chemical fertilisers. Presently, the fertilisers available were combinations of nitrogen, phosphorus and potassium, whose excess use can be dangerous for soil, plant and the micro-organisms, helpful to the soil. But the lure for profits in short period drive farmers to go for the chemical fertilisers. The growing demand for the chemical fertiliser also gives room for the black marketing of the fertilisers. A soil scientist, Dr Gurupada N Dandagi, associated with the Dharwad Agriculture University, has presented an alternative solution to meet the growing demand for fertiliser and save the land from abusing it with chemical fertiliser. Dr Dandagi said, presently the fertiliser crisis has been created because of the dependence on import of certain materials, which otherwise is abundantly available in India in its natural form. The scientist said rock phosphorus, commonly known as