JEB logo

Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

About Journal
    Home
    Obituary: Dr. R. C. Dalela
    Editorial Board
    Reviewer Panel
    Publication Policies
    Guidelines for Editors
    Guidelines for Reviewers
    Abstracting and Indexing
    Subscription and Payments
    Contact Journal
    About Triveni Enterprises
 
Read Journal
    Current Issue
    Journal Archives
 
For Authors
    Guidelines for Authors
    Terms and Conditions
    Fees and Payments
    Track Paper Status
 

Google Search the Journal web-site:


    Abstract - Issue Jul 2018, 39 (4)                                     Back


nstantaneous and historical temperature effects on a-pinene

Extinction coefficient and photosynthetically active radiation  use efficiency of summer rice as influenced by transplanting dates

 

P.K. Chakraborty1*,  S. Banerjee1, A. Mukherjee1, R. Nath2 and S. Samanta3

1Department of Agricultural Meteorology & Physics, Bidhan Chandra Krishi Viswa Vidyalaya, Mohanpur-741 252, India

2Department of Agronomy, Bidhan Chandra Krishi Viswa Vidyalaya, Mohanpur-741 252, India

3Department of Environmental Studies, Visva-Bharati, Santiniketan-731 235, India

*Corresponding Author E-mail: pramitikumar27@gmail.com

 

 

 

Key words

Biometric parameters

Extinction coefficient

PAR use efficiency

Summer rice

Transplanting dates

 

 

 

Publication Data

Paper received : 06.06.2017

Revised received : 25.09.2017

Re-revised received : 18.11.2017

Accepted : 02.12.2017      

 

Abstract

Aim: The present study was conducted to quantify the extinction coefficient and photosynthetically active radiation (PAR) use efficiency of widely cultivated variety “Shatabdi” under changing dates of transplanting and to suggest the farmers for proper transplanting window in this zone.    

 

Methodology: Thirty five-day-old rice seedlings were transplanted during January and February at three different dates (D1, D2 and D3) at a gap of 14 days with four irrigation regimes under strip plot design having three replications. Plant samples were taken at 14 days interval from each experiment and biometric parameters like LAI etc. and meteorological parameters like Incident PAR were estimated.        

 

Results: The results showed that the extinction coefficient decreased with delay in transplanting. The PAR use efficiency for biomass accumulation ranged from 2.07 to 2.19 g MJ-1 when transplanting dates varied from D1 to D3. The maximum grain yield was noted under D1 or D2 with no significant variation but a sharp reduction in yield was observed under D3. The PAR use efficiency for grain yield was noted under D2 (1.23 g MJ-1). The intercepted PAR at different phenophases significantly affected the grain yield.       Â    

 

Interpretation: On the basis of radiation utilization efficiency the crop may be transplanted within first fortnight of February in this zone.

 

 

Copyright © 2018 Triveni Enterprises. All rights reserved. No part of the Journal can be reproduced in any form without prior permission. Responsibility regarding the authenticity of the data, and the acceptability of the conclusions enforced or derived, rest completely with the author(s).

Â