Effect of long-term application of fertilizers on soil quality and rice yield in a salt-affected coastal region of India

Authors: Tripathi, S.¹; Chakraborty, A.²; Bandyopadhyay, B. K.³; Chakrabarti, K.¹

Source: Archives of Agronomy and Soil Science, Volume 54, Number 4, August 2008 , pp. 439-450(12)

Publisher: Taylor and Francis Ltd

Abstract:

The studied soils were collected from a 24-year long-term fertilizer experiment with rice (Oryza sativa L.) grown on tropical Typic Endoaquepts during monsoon season only. The organic carbon (OC) and total nitrogen (TN) status of the soils improved with the N100P22K42 treatment than the initial values at the start of the experiment. The available P status of the soils depleted in the N100P11K22 and N0P0K0 treatments than the initial value. Soil microbial biomass carbon (MBC) and basal soil respiration (BSR), activities of urease, acid and alkaline phosphatases as well as fluorescein diacetate hydrolyzing activity (FDHA) were the highest in the N100P22K42 treatment. The highest percentage of MBC in OC in the N100P22K42 treatment revealed the accumulation of organic matter with an overall improvement in nutrient status of soil, since MBC is a labile pool of plant nutrients. Long-term application of fertilizers (N100P22K42) had no deleterious effect on microbial and biochemical soil quality parameters. Rice grain yields were inconsistent with N100P0K0 and N0P0K0 while that of N100P22K42, N100P11K22 and N100P22K0 increased gradually during the course of the experiment for each block period of six years. The grain yield of rice showed high significant correlation with the microbial and biochemical soil parameters.

Keywords: microbial biomass; soil enzyme activity; long-term field experiment; chemical fertilizer; rice yield; coastal saline soil

Document Type: Research article

DOI: http://dx.doi.org/10.1080/03650340802214236

Affiliations: 1: Department of Agriculture Chemistry and Soil Science, Institute of Agricultural Science, University of Calcutta, Kolkata, India 2: Department of Agronomy, Bidhan Chandra Krishi Viswavidyalaya, West Bengal, India 3: Central Soil Salinity Research Institute, Regional Research Station, Canning Town, West Bengal, India

Publication date: 2008-08-01

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