Assessment of potassium status in soils under different land use systems of Assam

ANSHUMAN DAS; D R BISWAS; DEBARUP DAS; V K SHARMA; RUMA DAS; PRASENJIT RAY; AVIJIT GHOSH; NILIMESH MRIDHA; S S BISWAS

doi:10.56093/ijas.v89i7.91646

Authors

ANSHUMAN DAS PhD Scholar, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
D R BISWAS Principal Scientist, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
DEBARUP DAS Scientist, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
V K SHARMA Principal Scientist, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
RUMA DAS Scientist, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
PRASENJIT RAY Scientist, ICAR-National Bureau of Soil Survey & Land Use Planning, Regional Centre, Jorhat, Assam
AVIJIT GHOSH Scientist, ICAR-Indian Grassland and Fodder Research Institute, Jhansi, Uttar Pradesh
NILIMESH MRIDHA Scientist, ICAR-National Institute of Natural Fibre Engineering and Technology, Kolkata, West Bengal
S S BISWAS Scientist, ICAR-National Research Centre for Orchids, Dikling Road, Pakyong, Sikkim.

https://doi.org/10.56093/ijas.v89i7.91646

Keywords:

Exchangeable K, Land use systems, Non-exchangeable K, Potassium pools

Abstract

The knowledge on contribution of potassium (K) from different pools become pertinent for evaluating soil fertility status and providing better interpretation in near future. The present study aims to assess the soil K pools under major land use systems of Assam, viz. mulberry, sugarcane, tea and rice-mustard under three depths (0-15, 15-30 and 30- 60 cm) and categories them, based on the content of exchangeable K (Exch-K) and non-exchangeable K (NEK). In 0-15 cm soil depth, Exch-K content was highest in the rice-mustard land use system (49.7 mg/kg) whereas, NEK content were highest in the mulberry land use system (1351 mg/kg). Both Exch-K and NEK content were found to be highest under mulberry system at 15-30 and 30-60 cm depth. Mulberry and rice-mustard land use systems had higher amounts of NEK but lower in available K, thereby, need maintenance dose of K. The NEK pools were included along with Exch-K in categorising soils into nine groups for evolving better strategies to manage soil K fertility. Results revealed that most of the soils were in category with low Exch-K and NEK content. Irrespective of depths, soils from nine sites were low in both Exch-K and NEK. The third category soils with low Exch-K and high NEK had the second highest number of soils in all the depths.Thus, soils having low levels of both Exch-K and NEK, the K must be applied immediately to sustain crop productivity under different land use systems.

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