~ 1518 ~ International Journal of Chemical Studies 2020; 8(2): 1518-1521 P-ISSN: 2349–8528 E-ISSN: 2321–4902 www.chemijournal.com IJCS 2020; 8(2): 1518-1521 © 2020 IJCS Received: 19-01-2020 Accepted: 21-02-2020 Mahafuzar Rahaman Department of Agronomy, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal, India Kanu Murmu Department of Agronomy, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal, India Corresponding Author: Mahafuzar Rahaman Department of Agronomy, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal, India Growth and yield response to the application of different bio-stimulants on summer paddy Mahafuzar Rahaman and Kanu Murmu DOI: https://doi.org/10.22271/chemi.2020.v8.i2w.8976 Abstract A field experiment was conducted during rabi season of 2017-18 and 2018-19 at “C” block farm B.C.K.V Mohanpur, to study the growth and yield response of rice to the application of different bio- stimulants. The experimental design was “RBD” having ten treatments and three replications.Three types of bio-stimulants (Soligro,Opteine and Biozyme) along with vermiwash are applied in different formulation i.e granular and foliar application and combination of different time of application (Basal, Tillering and Panicle initiation Stage) along with Recommended dose of Fertilizer (RDF). The highest plant height and CGR were observed significantly in 100% RDF+ Soligro Granule at Basal and 30 DAT over control. Highest yield attributes and grain yield found in 100% RDF+ Opteine liquid at 30 DAT and 60 DAT treatment resulting in an increase by 35.03% grain yield, respectively compared to the control. The maximum straw yield was also achieved with the application of 100% RDF+ Soligro Granule at 30 and 60 DAT. Keywords: Seaweed extract, bio-stimulant, growth and yield parameters, rice Introduction Rice is central to the lives of billions of people around the world. Possibly the oldest domesticated grain (~10,000 years provides 21% of global human per capita energy and 15% of per capital protein. It is predicted that a 50 - 60% increase in rice production will be required to meet demand from population growth by 2025.India needs to produce 281 MT of food grains by 2020 to meet the food demand of 1.3 billion populations with an annual growth target of 2 per cent (Shetty et al., 2013) [10] . A rapidly growing world population has highlighted the need to significantly increase food production in the context of a world with accelerating soil and water shortages as well as climatic stress. This all the problem has generated new interest in the application of bio-stimulants in form of solid and liquid seaweed extracts because of their potent plant growth and yield enhancing properties through metabolic benefits, increased nutrient uptake, changes in plant tissue composition, increased resistance to frost, triggering disease response pathways and increasing stress tolerance (Zhang et al., 2003) [13] longer self-life of fruit and better seed germination (Tay et al. 1987, Stirk and Van Staden, 1997) [17, 11] . In recent years, the use of marine algae extracts as biofertilizers has allowed the partial substitution of conventional mineral fertilizers. These can be used as liquid extracts for foliar and soil applications, or in granular form as soil improvers and fertilizer. More than 15 million tons of seaweeds are produced annually (FAO, 2006) [4] . A bio-stimulant is an organic substance, when applied in small amounts enhances the plant growth and development and such response cannot be achieved by application of traditional plant nutrients (EBIC, 2012) [3] . Very little work on Seaweed fertilizer in rice has been reported so far. However, there is a lot of information have come out on the nutrient management of high yielding variety of rice. Considering the aforesaid facts this study aims to find an effective and efficient combination of bio-stimulant to increase the growth and yield of summer rice. Materials and Method Experimental site and soil information The field experiment was conducted in the Boro season of 2017-18 and 2018-19 on inceptisol at ‘C’ Block Farm of Bidhan Chandra Krishi Viswavidyalaya of Nadia district, of West Bengal