The use of seaweed-based bioproducts has been gaining momentum in crop production systems owing to their unique bioactive components and effects. They have phytostimulatory properties that result in increased plant growth and yield parameters in several important crop plants. They have phytoelicitor activity as their components evoke defense responses in plants that contribute to resistance to several pests, diseases, and abiotic stresses including drought, salinity, and cold. This is often linked to the upregulation of important defense-related genes and pathways in the plant system, priming the plant defenses against future attacks. They also evoke phytohormonal responses due to their specific components and interaction with plant growth regulation. Treatment by seaweed extracts and products also causes significant changes in the microbiome components of soil and plant in support of sustainable plant growth. Seaweed extracts contain a plethora of substances which are mostly organic, but trace levels of inorganic nutrient elements are also present. Fractionation of seaweed extracts into their components and their respective bioassays, however, has not yielded favorable growth effects. Only the whole seaweed extracts have been consistently proven to be very effective, which highlights the role of multiple components and their complex interactive effects on plant growth processes. Since seaweed extracts are highly organic, they are ideally suited for organic farming and environmentally sensitive crop production. They are also very compatible with other crop inputs, paving the way for an integrated management approach geared towards sustainability. The current review discusses the growth and functional effects evoked by seaweed extracts and their modes and mechanisms of action in crop plants which are responsible for elicitor and phytostimulatory activities. The review further analyses the potential value of seaweed extracts in integrated crop management systems towards sustainable crop production.

https://www.mdpi.com/2223-7747/10/3/531/pdf

Biostimulant Properties of Seaweed Extracts in Plants: Implications towards Sustainable Crop Production

Enhancing productivity through integrated nutrient management is pertinent to sustainable intensification of agricultural ecosystems. Field experiments were conducted during 2012 and 2013 in Eastern Himalayas with extracts from Kappaphycus alvarezii (K sap) and Gracilaria edulis (G sap) to assess growth, productivity and quality enhancement of rice (Oryza sativa). A Petri dish experiment was also conducted to assess the efficacy of saps in improving germination percentage and seedling vigour of rice seedlings. Field experiment included foliar spray of K and G saps (2.5, 5, 10 and 15% concentrations) with 100% recommended dose of fertilizers (RDF) along with water spray + 100% RDF (control). The rice seeds soaked with lower concentrations (2.5 and 5%) of K and G saps recorded higher germination percentage, root and shoot length and seedling vigour index as compared to water soaking. Whilst soaking in higher concentrations (7.5% and above) reduced the germination percentage and seedling vigour index. Foliar spray of K or G sap at 5% and above concentrations + 100% RDF significantly increased plant height, dry matter accumulation, chlorophyll index, crop growth rate, yield attributes and yield of rice (5.4 to 18.4% higher) as compared to control. Application of K or G sap at 10% concentrations + 100% RDF also increased micro-nutrient (Fe, Cu, Zn and Mn) and protein concentration in rice grains. Thus, foliar application of 10% K or G sap along with 100% RDF is a recommendable option for improving yield and quality of rice and sustaining soil fertility in eastern Himalayas and similar agroecosystems elsewhere.

Seaweed extract as organic bio-stimulant improves productivity and quality of rice in eastern Himalayas

The present study aimed to assess not only the efficacy of sap from two seaweeds Kappaphycus alvarezii (K-sap) and Gracilaria edulis (G-sap) on productivity and quality of Zea mays under rain-fed condition, but also to quantify whether sap application is beneficial in terms of lowering the carbon and phosphate footprint of mineral fertilizers per unit of produce. Field experiment was carried out to test 18 treatments, viz., 5 concentrations (2.5, 5.0, 7.5, 10 and 15 %) each of K-sap and G-sap applied along with recommended rate of fertilizers (RRF); 3 concentrations (7.5, 10 and 15 %) of each of the two types of sap applied along with 50 % RRF; alongside 2 control treatments T1 (water spray along with 100 % RRF) and T18 (water spray along with 50 % RRF). The optimal treatments that enhanced the grain productivity of maize were 5 % G-sap or 7.5 % K-sap applied in conjunction with 100 % RRF and the grain yield enhancements ranged from 21.4 to 29.8 % as compared to T1. Significant increase in P (35.5 %) and K (14.4 %) content in grains was observed through G-sap application, suggesting bio-stimulation in absorption of these elements. Notably, stover yield production at reduced RRF in certain combinations with sap was at par with T1 suggesting a possible saving on fertilizer requirement for fodder production under rain-fed conditions. Compared to T1, there was marked reduction of 17.5 and 23.1 % in global warming potential per unit of produce when 7.5 % K-sap and 5 % G-sap were used respectively in conjunction with 100 % RRF.

/pdf/sustainable-enhancement-in-yield-and-quality-of-rain-fed-1vdbgo1i9t.pdf

Sustainable enhancement in yield and quality of rain-fed maize through Gracilaria edulis and Kappaphycus alvarezii seaweed sap

Seaweeds are important marine renewable resources. Use of seaweeds as fertilizers has allowed for substitution in place of conventional synthetic fertilizers. This study was conducted to examine th...

Effect of seaweed sap as foliar spray on growth and yield of hybrid maize

The objective of this investigation was to evaluate the impact of seed priming with seaweed liquid extracts (SLEs) prepared from three Egyptian seaweeds (Ulva fasciata, Cystoseira compressa, and Laurencia obtusa) in a concentration of 20 g L-1 on seed germination and seedling growth of Vigna sinensis and Zea mays as well as the effectiveness of these extracts in ameliorating salinity stress. Laurancia extract (LLE) induced the maximum positive response in germination as well as producing the maximum increases in all seedling morphological parameters with percent of response 87.14% for hypocotyl growth of V. sinensis and 85.71% coleoptile elongation of Z. mays. The maximum amylase and protease activities were recorded with LLE priming. Ulva, Cystoseira, Laurencia liquid extract consortium (UCLLE) induced the highest promotion effect for both V. sinensis and Z. mays giving significant increments for all growth criteria, dry biomass 0.301 and 0.438 g seedling-1, Chl a 18.98 and 13.79 mg g-1 FW, total carbohydrates 460.88 and 518.14 g seedling-1, protein 219.72 and 207.49 g seedling-1 respectively. Seeds primed with UCLLE consortium exhibited remarkable tolerance for salinity stress, meanwhile the highest ameliorating effect was pronounced with 10% SW supplementation. Priming with SLEs enhances the growth of either V. sinensis or Z. mays under salinity stress, whereas UCLLE consortium induced significant increases in biomass 0.231 and 0.379 g seedling-1, respectively. Seed priming with SLEs enhanced guaiacol peroxidase activity giving the highest value with UCLLE consortium conjugated with 25% SW (12.47 and 13.05 μmol min-1 g-1 FW), respectively. Application of Canonical Corresponding analysis (bi-plot) demonstrates a significant correlation between variables of SLEs components and germination indices of the two plants concluding total nitrogen, total phosphorous, potassium, ascorbic acid, and amino acids besides carbohydrate content. Therefore, results maintain the concept of SLEs as agricultural biocatalyst which could be practiced as prospective biostimulants for being feasible, sustainable, eco-friendly, and effective in improving salinity tolerance for some plants.

Seaweed extracts as prospective plant growth bio-stimulant and salinity stress alleviator for Vigna sinensis and Zea mays

A field experiment was conducted during the rabi season of 2012-13 at Research cum Instructional Farm of Indira Gandhi Krishi Vishwavidyalaya, Raipur (Chhattisgarh) to study the effects of seaweed saps on growth, yield, nutrient uptake and economic of maize (sweet corn) in Matasi soil of Chhattisgarh. The foliar spray of two different species (namely Kappaphycus and Gracilaria) was applied thrice at different interval of crop with different concentrations (0, 2.5, 5.0, 7.5, 10.0 and 15% v/v) of seaweed extracts. Foliar applications of seaweed extract significantly enhanced the growth, yield, nutrient uptake and B:C ratio parameters. The green cob yield (189.97 q ha-1) and fodder yield (345.19 q ha-1) were recorded highest under treatment (T8) 15% G Sap + recommended dose of fertilizer (RDF) which was significant similar with treatment 15% K Sap + RDF (185.24 q ha-1) in case of green cob yield. The highest N, P and K uptake by green cob and fodder were observed under 15% G Sap + RDF (T8). Treatment 15% G Sap + RDF (T8), recorded maximum gross return (Rs. 2,07,230 ha-1), net return (Rs. 1,38,756 ha-1) and B:C ratio (2.0), which was followed by treatment 15% K Sap + RDF (T4) with net return (Rs. 1,33,199 ha-1) and B:C ratio (1.95). Treatment 15% G Sap + RDF (T8) gave Rs. 45,996 ha-1 more as compared to Water spray + RDF (T9).

https://journals.ansfoundation.org/index.php/jans/article/download/716/672

Effect of seaweed saps on growth, yield, nutrient uptake and economic improvement of maize (sweet corn)

A field experiment was conducted during rabi 2012–13 at Research-cum-Instructional Farm, IGKV, Raipur, Chhattisgarh (India) to study the effects of seaweed saps on growth, yield, nutrient uptake and economic of potato in Inceptisol soil. Foliar spray of the extracts of two seaweeds (Kappaphycus and Gracilaria) was done on potato crop separately twice at different concentrations (0, 2.5, 5.0, 6. 25, 7.5 and 10.0% v/v). Foliar application of seaweed extract significantly enhanced growth, yield, nutrient uptake and benefit: cost ratio (B: C) in potato crop. The highest tuber yield was observed with the applications of 10% Gracilaria sap + recommended dose of fertilizer (RDF), followed by 10% Kappaphycus sap + RDF treatment showing 11.31 and 9.37% tuber yield increase, respectively, over control (water spray + RDF). The highest uptake of N, P and K by tuber and haulm was observed in 10% Gracilaria sap + RDF treatment. The highest net return ha−1 (Rs. 1, 14, 871) and B: C ratio (1.21) were observed with the application of 10%Gracilaria sap + RDF.

Effect of Seaweed Saps on Growth, Nutrient Uptake and Yield of Potato (Solanum tuberosum L.)

A field experiment was conducted during the rabi season of 2012–13 at Raipur to study the effects of seaweed saps on yield, nutrient uptake and nutrient use efficiency of potato (Solanum tuberosum L.) and soil fertility status in Inceptisol of Chhattisgarh. Foliar spray was applied thrice at different concentrations (0, 2.5, 5.0, 6.25, 7.5, and 10.0% v/v) of seaweed extracts, viz. Kappaphycus and Gracilaria. Foliar applications of seaweed extract significantly enhanced the yield, nutrient uptake and soil fertility parameters. The highest tuber yield was recorded with the application of 10% Gracilaria Sap + recommended dose of fertilizer (RDF), followed by 10% Kappaphycus Sap + RDF extract resulting in an increase by 11.31 and 9.38% tuber yield, respectively comparedto the control (water spray +RDF). The highest NPK uptake by tuber and haulm were observed under 10% Gracilaria Sap + RDF. After the harvest of the crop indicated maximum available N (265.51 kg ha−1) and available K (389.39 kg ha−1) was observed under 10% Gracilaria Sap+ RDF. Higher values of available P (11.77 kg ha−1) was recorded with 6.25% Kappaphycus Sap + 50% RDF.

Effects of seaweed saps on soil health and productivity of potato (Solanum tuberosum L.)

The experiment was carried out at Research Cum Instructional Farm of the Indira Gandhi Krishi Vishwavidalaya, Raipur (C.G.) during kharif season of 2012 and 2013. The per cent increase in the grain yield and straw yield by 12 days old seedlings (25 cm x 25 cm + S2-3, T2)was 30.13 per cent over 21 days old seedlings. The treatment 25 cm X 25 cm with 2-3 seedlings (T 2 ) was also produced maximum plant height (cm), yield parameters and ultimately the significantly highest grain yield (38.20 q ha -1 ) and straw yield (77.91 q ha -1 ).

Effect of planting geometry and seedling density on growth and yield of scented rice under sri based cultivation practices

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Ashok Pal

Author Tools

Chat about Author

Papers

Effect of seaweed saps on growth, yield, nutrient uptake and economic improvement of maize (sweet corn)

Effect of Seaweed Saps on Growth, Nutrient Uptake and Yield of Potato (Solanum tuberosum L.)

Effects of seaweed saps on soil health and productivity of potato (Solanum tuberosum L.)

Effect of planting geometry and seedling density on growth and yield of scented rice under sri based cultivation practices