Ghosh, Avijit and Bhattacharyya, Ranjan and Dwivedi, Brahma Swaroop and Biswas, Dipak Ranjan and Meena, Mahesh Chandra and Sarkar, Abhijit and Agarwal, Binay Kumar and Mahapatra, Prabhakar and Shahi, Dhirendra Kumar and Agnihorti, Rajesh and Sawlani, Ravi (2018) Depth dynamics of soil N contents and natural abundances of N-15 after 43 years of long-term fertilization and liming in sub-tropical Alfisol. Archives of Agronomy and Soil Science, 64 (9). pp. 1290-1301. ISSN 0365-0340

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Abstract

The aim of this study was to understand impacts of long-term (43years) fertilization on soil aggregation, N accumulation rates and N-15 in surface and deep layers in an Alfisol. Soil samples from seven treatments were analysed for N stocks, aggregate-associated N in 0-30 cm and the changes in N-15 in 0-90 cm depths. The treatments were: unfertilized control (control); recommended N dose (N); recommended N and phosphorus doses (NP); recommended N, P and potassium doses (NPK); 150% of recommended N, P and K doses (150% NPK); NPK + 10Mg FYM ha(-1) (NPK + FYM) and NPK + 0.4Mg lime ha(-1) (NPK + L). Results revealed that plots under NPK + FYM had similar to 39% higher total N concentrations than NPK + L in 0-30 cm soil layers. In NPK + L, macro-aggregates had 35 and 11% and microaggregates had 20 and 9% lower N-15 values than NPK + FYM in 0-15 and 15-30 cm soil layers, respectively. However, plots receiving NPK + FYM had similar to 39% greater deep soil (30-90 cm) N accumulation than NPK + L. These results would help understanding N supplying capacity by long-term fertilization and assist devising N management strategies in sub-tropical acidic Alfisols.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Taylor & Francis.
Subjects:	Agronomy > Plant and Soil Scienc Agronomy
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	04 Feb 2020 08:25
Last Modified:	04 Feb 2020 08:25
URI:	http://npl.csircentral.net/id/eprint/3832

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