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Journal of the Indian Society of Soil Science
Year : 2004, Volume : 52, Issue : 1
First page : ( 29) Last page : ( 34)
Print ISSN : 0019-638X.

Effect of Different Farming Systems on Phosphorus Fractions in an Acid Alfisol of Meghalaya

Majumdar B.*, Venkatesh M.S., Kumar Kailash,  Patiram

Division of Soil Science, ICAR Research Complex for NEH Region, Umiam, Meghalaya, 793103

*Corresponding author: (E-mail: bijju5@rediffmail.com)

Received:  December,  2002; Accepted:  December,  2003.

Abstract

The effect of eight watershed-based fanning systems consisting of livestock farming (FSW1), forestry (FSW2), agroforestry (FSW3), agriculture (FSW4), agri-horti-silvi-pastoral (FSW5), horticulture (FSW6), natural fallow (FSW7) and abandoned jhum land (FSW8) on different forms of P was studied after 17 years of adoption under rainfed condition on hill slopes of Meghalaya. All the forms of P except organic P were significantly highest in FSW4 followed by FSW1 and FSW5 and the lowest values of inorganic P were recorded in FSW8 followed by FSW7. The FSW8 registered the highest value of organic P, which was 60.7% of total P while the contribution of organic P to total P was lowest (32.7%) in FSW4 suggesting higher P mineralization in this system. Among the inorganic fractions of P, the highest value was recorded for reductant soluble P, followed by AI-P, Fe-P, occluded-P, Ca-P and saloid bound P, respectively, in all the systems except FSW7 and FSW8. There was a continuous increase in all the P fractions from top to bottom of the watersheds under different farming systems. The FSW1, FSW4, FSW5 and FSW6 with terraces in the bottom retained relatively higher magnitude of all the forms of P. Soil pH, ECEC and base saturation showed significant positive correlation with all the forms of P.

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Key words

Farming systems, phosphorus fractions, Alfisol.

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