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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2018: 95.39
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2018: 95.39
For more details click here

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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
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Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2018: 95.39
NAAS RATING 2020: 5.38

Int.J.Curr.Microbiol.App.Sci.2018.7(4): 390-399
DOI: https://doi.org/10.20546/ijcmas.2018.704.044


Precision Nitrogen Management Based on NDVI and In-Season Estimates of Response Index in Wheat
Rekha Ratanoo1*, Satish Kumar2, A.K. Dhaka2 and Lalit Rolaniya1
1Department of Agronomy, Punjab Agricultural University, Ludhiana, Punjab-141004, India
2Department of Agronomy, CCS Haryana Agricultural University, Hisar, Haryana-125001, India
*Corresponding author
Abstract:

Fertilizer N management using optical sensor (GreenSeeker®) was evaluated at CCSHAU, Hisar. The experiment was laid out in randomized block design with three replications. There were 12 treatments comprising N application with and without using GreenSeeker. N application without using GreenSeeker consisted of two treatments having recommended dose (150 kg/ha) in two (75 kg/ha each) and three (50 kg/ha each) equal splits. GreenSeeker guided N application was combined with fixed rate (75, 100 and 125 kg/ha) and fixed time N application (nine treatments) as basal and at 25 DAS. GreenSeeker was used with each fixed level of N application at 2nd (50 DAS) and/or 3rd irrigation (65 DAS). One treatment was control where no fertilizer N was applied. During the procedure of finding out fertilizer N requirement using GreenSeeker, NDVI values and related parameters were calculated and analyzed. In general, NDVI values were higher in treatment having higher dose of fixed rate N at planting and CRI stage. At 65 DAS (3rd irrigation) the increase in NDVI values was more in treatment having N application at 50 DAS (2nd irrigation) with or without using GreenSeeker and it ranged from 11.7 to 22.2% as compared to treatment having no N application at 2nd irrigation where it was only 2.6 to 9.1%. Responsiveness of a particular treatment to further addition of applied fertilizer i.e. Response index (RINDVI) values were inversely proportional to amount of fixed rate N application. RINDVI values remained low throughout the crop growth stages where frequency of N application was higher. Total N uptake and NDVI values were highly correlated and values of coefficient of determination were higher at middle crop growth stages as compared to early and late stages.


Keywords: Wheat, GreenSeeker (GS), optical sensor, NDVI, response index
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How to cite this article:

Rekha Ratanoo, Satish Kumar, A.K. Dhaka and Lalit Rolaniya. 2018. Precision Nitrogen Management Based on NDVI and In-Season Estimates of Response Index in Wheat.Int.J.Curr.Microbiol.App.Sci. 7(4): 390-399. doi: https://doi.org/10.20546/ijcmas.2018.704.044