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CHLOROPHYLLMETER-BASED NITROGEN MANAGEMENT OF WHEAT IN EASTERN INDIA

Published online by Cambridge University Press:  27 February 2017

MAINAK GHOSH ,
DILLIP KUMAR SWAIN ,
MADAN KUMAR JHA  and
VIRENDRA KUMAR TEWARI
MAINAK GHOSH
Affiliation:
Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur, West Bengal, India Department of Agronomy, Bihar Agricultural University, Sabour, Bihar, India
DILLIP KUMAR SWAIN*
Affiliation:
Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur, West Bengal, India
MADAN KUMAR JHA
Affiliation:
Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur, West Bengal, India
VIRENDRA KUMAR TEWARI
Affiliation:
Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur, West Bengal, India
*
§Corresponding author. Email: [email protected]
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Summary

Topdressing of N fertilizer, whenever leaf greenness, as measured by Chlorophyllmeter (SPAD), falls below the threshold value can be used for site-specific N management in wheat cultivation. Herein, a field experiment was conducted to analyse the effect of SPAD-based N management on wheat productivity and N use efficiency during the dry season of 2010/11 and 2011/12 on acid lateritic soil of eastern India. The experiment had 12 treatments, with nine treatments combining three SPAD thresholds (38, 40 and 42) and three N levels (15, 25 and 35 kg N ha−1) as real time N management (RTNM), one fixed time N management (FTNM), one farmers’ fertilizer practise (FFP) and control (Zero N), with three replications. The grain yield of RTNM ranged from 90 to 113% as that of FTNM, but using considerably less N. Maintaining SPAD threshold of 40 up to heading stage by topdressing 25 kg N ha−1 at each time (N25S40) caused the highest grain yield (4483 kg ha−1). While saving 22.5 kg N ha−1 (18.8%), N25S40 increased agronomic N use efficiency by 58.5%, nitrogen recovery efficiency by 15.1% and partial factor productivity of applied N by 26.4% when compared with conventional fertilizer recommendations (i.e. FTNM). The SPAD-based N management strategy was found very promising in efficiently managing N fertilizer in wheat for improving wheat productivity and N use efficiency.

Type
Research Article
Information
Experimental Agriculture , Volume 54 , Issue 3 , June 2018 , pp. 349 - 362
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Copyright
Copyright © Cambridge University Press 2017 

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