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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 2017: 100.00
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2017: 100.00
For more details click here

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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
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Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2017: 100.00
NAAS RATING 2018: 5.38

Int.J.Curr.Microbiol.App.Sci.2019.8(9): 1382-1396
DOI: https://doi.org/10.20546/ijcmas.2019.809.159


Differential Response of Rice Hybrids and Varieties to Nitrogen Fertilization and their Exploitation in Andaman and Nicobar Islands
B. Gangaiah*, Adamala Sirisha, S. Swain and T. Subramani
Division of Natural Resource Management, ICAR-Central Island Agricultural Research Institute, Port Blair, Andaman & Nicobar Islands, India
*Corresponding author
Abstract:

In Andaman and Nicobar Islands, India, rice productivity is low due to traditional long duration variety (C-14-8) cultivation on poorly fertile soils with minimal or no fertilizer use due to heavy rains. In this context, ability of rice hybrids and high yielding varieties (HYV) under varying nitrogen supplies to adopt and enhance rice productivity and profits. Field study was made during 2015 rainy season in split plot design with three replications. Treatments formed by combination of 5 rice cultivars (3 hybrids: KRH-4, 28P09 & DRRH-3 and two HYV: WGL-14 and CARI Dhan-6) in main plot and four nitrogen (N) rates (0, 50, 100 and 150 kg/ha) as sub-plot treatments. Best performing cultivars (KRH-4 hybrid and WGL-14 variety) and nitrogen rate (100 kg) were evaluated in 2016 and 2018 seasons. Results (2015 season) have indicated that KRH-4 and 28P09 hybrids have 39.2 and 28.2% yield improvements over local HYV CARI Dhan-6 (2.09 t/ha). Above higher yields of hybrids with similar cost of cultivation as that of a variety have brought 3.16-4.52 times more profits. Grain yield exhibited linear response to nitrogen up to 150 kg rate, however, its application beyond 100 kg was not economically rewarding. Rice cultivar and nitrogen interaction indicated that KRH-4 hybrid was suitable for both no, low and high N inputs. Rice hybrid ‘28P09’ required N fertilization (100 kg) for its potential performance. Confirmatory trails of KRH-4 for two seasons (2016 & 2018) have shown 17.1% yield advantage over HYV ‘WGL-14’ over 3 seasons at 100 kg N rate. The study proved that hybrids are better candidates for Island ecosystem where response to N fertilization is rainfall dependent and soils have inherent fertility.


Keywords: Rice, Hybrid, Nitrogen, Net income, High yielding variety
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How to cite this article:

Gangaiah, B., Adamala Sirisha, S. Swain and Subramani, T. 2019. Differential Response of Rice Hybrids and Varieties to Nitrogen Fertilization and their Exploitation in Andaman & Nicobar Islands.Int.J.Curr.Microbiol.App.Sci. 8(9): 1382-1396. doi: https://doi.org/10.20546/ijcmas.2019.809.159