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Ahmad, N. 1999. Fertilizer scenario in Pakistan: policies and development. In: Proc. Conference on Agriculture and Fertilizer Use by 2010. NFDC Publication 2/99. Islamabad.

Ahmad, N. & Chaudhry, A. G. 2000. Fertilizer use at farm level. NFDC publication 4/2000. Islamabad.

Ahmad, N. 2000. Integrated plant nutrition management in Pakistan: status and opportunities. In: Proc. Symposium on Integrated Plant Nutrition Management, NFDC. pp:18-37. Islamabad.

Ahmad, N. & Rashid, M. 2003. Fertilizers and their use in Pakistan. Extension Guide. Islamabad.

Ahmad, N. & Muhammad, T. 1998. Fertilizer plant nutrient management and self reliance in agriculture. The Pakistan Development Review 37:4, 217-233.

FAO/UNESCO. 1974. Soil Map of the World 1:5 000 000. Volume I. Legend. UNESCO, Paris.

FAO. Web Site: Rome.

Government of Pakistan. 1994. 1990 Census of agriculture. Agricultural Census Organization. Economic Affairs and Statistics Division. Islamabad.

Government of Pakistan. 2001. Water resources development. Ten year perspective development plan. Planning Commission. pp 277-292. Islamabad.

Government of Pakistan. 2003. Agricultural statistics: 2001-02 Ministry of Food, Agriculture and Livestock. Islamabad.

Government of Pakistan. 2003. Pakistan Economic Survey 2002-03. Ministry of Finance. Islamabad.

Mian, A. & Javed, Y. 1993. The soil resources of Pakistan - their potential, present stage and strategies for conservation. Sector paper for National Strategy. 53 pp. Islamabad.

NFC-National Fertilizer Corporation of Pakistan Ltd. 1981. A study on differential impact of fertilizer price increase on its use in Pakistan: Fertilizer use pattern in Pakistan Rabi 1980-81. NFC-NFDC. Islamabad.

NFDC. 1989. Crop response to fertilizer. NFDC Publication 4/89. Islamabad.

NFDC. 1998. Micronutrients in agriculture. Pakistan Perspective Publication No. 4/98. Islamabad.

NFDC. 2000. Fertilizer use survey. NFDC Publication. Islamabad.

NFDC. 2001. Balanced fertilization through phosphate promotion. FAO/IMPHOS/ NFDC Report. Islamabad.

NFDC. 2003. Fertilizer Review 2002-03, National Fertilizer Development Centre (NFDC), Planning and Development Division. Islamabad.

NFDC. National Fertilizer Development Centre. 1996. Fertilizer use on wheat: farm level survey Rabi 1991-92. Mimeo. Islamabad.

PARC. 1980. Crop ecological regions in Pakistan. Memograph. Islamabad.

Twyford, I. T., Ghaffar Chaudhry, M. & Muhammad Sadiq. 1995. Plant nutrition policies and strategies for sustainable agricultural development in Pakistan: executive summary, policy options and action programme. National Fertilizer Development Centre. Islamabad.

Twyford, I. T., Bajwa, M. I. & Tahir Saleem, M. 1993. Fertilizer use at farm level in Pakistan. National Fertilizer Development Centre. Islamabad.

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