Environmental consequences of agricultural development: a case study from the Green Revolution state of Haryana, India

The Green Revolution in India has achieved self-sufficiency in food product ion. However, in the state of Haryana this has resulted in continuous envir onmental degradation, particularly of soil, vegetation and water resources. Soil organic matter levels are declining and the use of chemical inputs is intensifying. Newly introduced crop varieties have been responsive to inpu ts but this has necessitated both increased fertiliser application and use of irrigation resulting in water contamination by nitrate and phosphate and changes in the ground water table. With 82% of the geographic area already under cultivation, the scope for increased productivity lies in further in tensification which is crucially dependent on more energy-intensive inputs. Declining nutrient-use efficiency, physical and chemical degradation of so il, and inefficient water use have been limiting crop productivity, whilst the use of monocultures, mechanisation and an excessive reliance on chemica l plant protection have reduced crop, plant and animal diversity in recent years. About 60% of the geographical area faces soil degradation (waterlogg ing, salinity and alkalinity) which threatens the region's food security in the future. Since 1985, the water table has risen more than 1 m annually, and patches of salinity have started to appear at the farm level. The situa tion is worse in higher rainfall areas where waterlogging follows shortly a fter the rains. Apart from affecting agricultural crops, a high water table causes floods even following slight rains due to the reduced storage capac ity of the soil. Such ecological impacts are motivating farmers to reduce f ertiliser and pesticides use. This has led to an increased investment in al ternative technology and products including an interest in Integrated Pest Management. The paper discusses major physical, hydrological, chemical and biological constraints relating to soil and water resources for ecosystem s ustainability. (C) 2000 Elsevier Science B.V. All rights reserved.