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Journal of the Indian Society of Soil Science
Year : 2007, Volume : 55, Issue : 2
First page : ( 167) Last page : ( 174)
Print ISSN : 0019-638X.

Effect of rock phosphate, superphosphate and their mixtures with FYM on soybean and soil-P pools in a typic hapludalf of Meghalaya

Majumdar B.*,1, Venkatesh M.S.2, Kumar Kailash3,  Patiram

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

*Corresponding author: (Email: bijju5@rediffmail.com)

Present address: 1Division of Crop Production, Central Research Institute for Jute and Allied Fibres, Nilganj, Barrackpore, Kolkata, West Bengal, 700120

2Indian Institute of Pulses Research, Kanpur, Uttar Pradesh

3Centrtal Institute for Sub-tropical Horticulture, Rehmankhera, Lucknow, Uttar Pradesh, 227107

Received:  December,  2004; Accepted:  June,  2007.

Abstract

A field experiment was conducted for five consecutive years on a phosphorus-deficient Typic Hapludalf to study the efficiency of SSP (single superphosphate), RP (rock phosphate) and their mixtures along with FYM on soybean. The yield, P uptake, protein and oil content of soybean increased significantly with P alone or with FYM irrespective of sources over control and maximum values were recorded with SSP @ 60 kg P2O5 ha−1 + FYM, followed by SSP + RP (1:1) @ 60 kg P2O5 ha−1 + FYM. The organic carbon, available P and N in soil increased by 11.5 to 35.4, 23.1 to 199 and 7.5 to 15.5%, respectively over the initial status in various treatments after 5 years of cropping. The fate of applied P in soil indicated that total and organic P increased significantly with different sources of applied P and organic P contributed 48.9 to 53.7% of total P. Among inorganic fractions, significant increase in saloid-P, Al-P, Fe-P and Ca-P but depletion in reductantsoluble and occluded-P was observed. The P use efficiency was higher at lower doses of applied P with the maximum value (21.3%) recorded with SSP @ 30 kg P2O5 ha−1 + FYM treatment. Application of 60 kg P2O5 ha−1 through SSP alone or with FYM was most efficient dose for production of high quality soybean and forms of P build up followed by 60 kg P2O5 ha−1 as SSP + RP (1:1) with or without FYM in acid Alfisol of Meghalaya.

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Key words

Rock phosphate, superphosphate, FYM, soybean, P-fractions, Typic Hapludalf.

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