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Agronomy 2018, 8(12), 292; https://doi.org/10.3390/agronomy8120292

Optimizing Potassium Application for Hybrid Rice (Oryza sativa L.) in Coastal Saline Soils of West Bengal, India

1
Bidhan Chandra Krishi Viswavidyalaya, Regional Research Station (CSZ), Kakdwip 743347, South 24 Parganas, West Bengal, India
2
Ramakrishna Mission Vivekananda Educational and Research Institute, Sasya Shyamala Krishi Vigyan Kendra, Narendrapur, Kolkata 700103, West Bengal, India
3
International Plant Nutrition Institute, South Asia (East India and Bangladesh) Program, 36 Gorakshabasi Road, Kolkata 700028, West Bengal, India
4
International Plant Nutrition Institute, Asia and Africa Programs, Palm Drive, B-1602, Golf Course Extension Road, Sector-66, Gurgaon 122001, Haryana, India
5
International Plant Nutrition Institute, South Asia Program, 354, Sector 21, Gurgaon 122016, Haryana, India
6
Soils and Environment Research Group, Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Melbourne, VIC 3010, Australia
*
Author to whom correspondence should be addressed.
Received: 23 October 2018 / Revised: 27 November 2018 / Accepted: 27 November 2018 / Published: 4 December 2018
(This article belongs to the Special Issue Fertilizer Application on Crop Yield)
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Abstract

The present study assesses the response of hybrid rice (variety Arize 6444) to potassium (K) application during rainy (wet) seasons of 2016 and 2017 in coastal saline soils of West Bengal, India. The study was conducted at the Regional Research Farm, Bidhan Chandra Krishi Viswavidyalaya, Kakdwip, West Bengal. The soil is clayeywith acidic pH (5.91), saline (Electrical conductivity/EC 1.53 dS m−1) and of high K fertility (366 kg ha−1). The experimental plots were laid out in a randomized complete block design with five (5) K treatments (0, 30, 60, 90, and 120 kg K2O ha−1) with four replications. Plant height, dry matter (DM) in different plant parts, number of tillers, and grain yield were measured in each treatment for the determination of optimum K dose. The study revealed that the stem, leaf, and grain dry matter production at 60 days after transplanting (DAT) and harvest were significantly (p ≤ 0.05) higher at 90 kg K2O ha−1 application. The number of tillers hill−1 was also higher (p ≤ 0.05) in plants fertilized with 90 kg K2O ha−1 over K omission. At harvest, grain K concentration improved (p ≤ 0.05) with K fertilization at 90 kg K2O ha−1, 116% more than the zero-K. Omission of K application from the best treatment (90 kg K2O ha−1) reduced grain yield by 3.5 t ha−1 even though the available K content was high. Potassium uptake restriction due to higher Mg content in the soil may have caused reduced uptake of K leading to yield losses. The present study also showed higher profits with 90 kg K2O ha−1 with higher net returns (US$ 452 ha−1) and benefit:cost ratio (1.75) over other treatments from hybrid rice (var. Arize 6444). From the regression equation, the economic optimum level of K (Kopt) was derived as 101.5 kg K2O ha−1 that could improve productivity of hybrid rice during the wet season in coastal saline soils of West Bengal. View Full-Text
Keywords: hybrid rice; K use efficiency; potassium; saline tract hybrid rice; K use efficiency; potassium; saline tract
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Banerjee, H.; Ray, K.; Dutta, S.K.; Majumdar, K.; Satyanarayana, T.; Timsina, J. Optimizing Potassium Application for Hybrid Rice (Oryza sativa L.) in Coastal Saline Soils of West Bengal, India. Agronomy 2018, 8, 292.

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