Nitrogen contribution to wetland rice by green manuring with Sesbania spp. in an alkaline soil

Ghai, S. K.; Rao, D. L. N.; Batra, Lalita

doi:10.1007/bf00257915

Cited by 33 publications

(16 citation statements)

References 2 publications

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“…Alternatively, green manuring of such soils may be done for the improvement of soil structure and enhancement of N content. Ghai et al (1988) reported that sesbania [Sesbania bispinosa (Jacq.) W. Wight or Sesbania aculeata Pers.…”

Section: Macronutrientsmentioning

confidence: 99%

Degradation processes and nutrient constraints in sodic soils

Qadir¹,

Schubert²

2002

Land Degrad Dev

378

186

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Accumulation of excess sodium (Na þ ) in a soil causes numerous adverse phenomena, such as changes in exchangeable and soil solution ions and soil pH, destabilization of soil structure, deterioration of soil hydraulic properties, and increased susceptibility to crusting, runoff, erosion and aeration, and osmotic and specific ion effects on plants. In addition, serious imbalances in plant nutrition usually occur in sodic soils, which may range from deficiencies of several nutrients to high levels of Na þ . The structural changes and nutrient constraints in such soils ultimately affect crop growth and yield. The principal factor that determines the extent of adverse effects of Na þ on soil properties is the accompanying electrolyte concentration in the soil solution, with low concentration promoting the deleterious effects of exchangeable Na þ even at exchangeable sodium percentage (ESP) levels less than 5. Consequent to an increase in the use of poor quality waters and soils for crop production, the problems of sodic soils can be expected to increase in future. The mechanisms that explain sodic behaviour can provide a framework in which slaking, swelling and dispersion of clay together with nutrient constraints in sodic soils may be assessed so that the practices to manage such soils can be refined for long-term sustainable agriculture.

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Section: Macronutrientsmentioning

confidence: 99%

Degradation processes and nutrient constraints in sodic soils

Qadir¹,

Schubert²

2002

Land Degrad Dev

378

186

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“…N loss could be reduced further if the ammonia pool resulting from urea hydrolysis was partly substituted by green manures or organic manures. Ghai et al (1988) reported that Sesbania aculeata, if grown for 45 days and green manured, enriches alkali soils by contributing 122 kg N ha-1 for rice crop. Rao and Batra (1983) reported that N losses were completed by the fourth day in upland soil, but were least at 40 kg N ha-1 .…”

Section: Nitrogenmentioning

confidence: 98%

Salt-Affected Soils: Their Reclamation and Management for Crop Production

Gupta

Abrol

1990

Advances in Soil Science

270

161

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“…Alternatively, green-manuring of such soils can be used to improve soil structure and enhance N content. Ghai et al (1988) reported that sesbania (Sesbania bispinosa), grown for 45 days and greenmanured, enriched sodic soils by making up to 122 kg N ha À1 available to the rice crop that followed it. It has also been shown that soil N levels can be increased by up to 80 kg ha À1 solely through the action of sesbania roots alone (i.e.…”

Section: Soil Fertility (Nutrient Availability Status)mentioning

confidence: 99%

Sodicity‐induced land degradation and its sustainable management: problems and prospects

Noble²,

et al. 2006

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Currently at least 20 per cent of the world's irrigated land is salt-affected. However, projections of global population growth, and of an increased demand for food and fibre, suggest that larger areas of salt-affected soil will need to be cropped in the future. About 60 per cent of salt-affected soils are sodic, and much of this land is farmed by smallholders. Ameliorating such soils requires the application of a source of calcium (Ca 2þ ), which replaces excess sodium (Na þ ) at the cation exchange sites. The displaced Na þ is then leached from the root zone through excess irrigation, a process that requires adequate flows of water through the soil. However, it must now be recognized that we can no longer conduct sodic soil amelioration and management solely with the aim of achieving high levels of crop productivity. The economic, social, and environmental impacts of different soil-amelioration options must also be considered. A holistic approach is therefore needed. This should consider the cost and availability of the inputs needed for amelioration, the soil depth, the level to which sodicity needs to be reduced to allow cropping, the volume and quality of drainage water generated during amelioration, and the options available for drainage-water disposal or reuse. The quality and cost of water available for post-amelioration crops, and the economic value of the crops grown during and after amelioration should also be taken into account, as should farmers' livelihoods, the environmental implications of amelioration (such as carbon sequestration), and the long-term sustainable use of the ameliorated site (in terms of productivity and market value). Consideration of these factors, with the participation of key stakeholders, could sustainably improve sodic soil productivity and help to transform such soils into a useful economic resource. Such an approach would also aid environmental conservation, by minimizing the chances of secondary sodicity developing in soils, particularly under irrigated agriculture.

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Nitrogen contribution to wetland rice by green manuring with Sesbania spp. in an alkaline soil

Cited by 33 publications

References 2 publications

Degradation processes and nutrient constraints in sodic soils

Degradation processes and nutrient constraints in sodic soils

Salt-Affected Soils: Their Reclamation and Management for Crop Production

Sodicity‐induced land degradation and its sustainable management: problems and prospects

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