Effect of Vegetal- and Seaweed Extract-Based Biostimulants on Agronomical and Leaf Quality Traits of Plastic Tunnel-Grown Baby Lettuce under Four Regimes of Nitrogen Fertilization

Nitrogen (N) fertilizers play a crucial role in agriculture, representing a powerful tool for farmers for increasing yields throughout the seasons under both optimal and suboptimal conditions. At the same time, their synthetic/chemical nature could have several influences on ecosystems and human health. For this reason, there is an urgent need to find new and more sustainable means of production to increase plant productivity and optimize nitrogen use. An experiment was conducted in a plastic tunnel to assess the response of baby lettuce crop to the foliar application of three plant biostimulants (PBs): Legume-derived protein hydrolysate (LDPH) ‘Trainer®’, tropical plant extract (TPE) ‘Auxym®’ and seaweed extract (SwE) from Ecklonia maxima ‘Kelpak®’ under different N rates of 0, 10, 20 and 30 kg N·ha−1. The responses of baby lettuce plants were assessed in terms of yield, growth parameters and physicochemical composition of the leaves. The fresh yield of baby lettuce in both biostimulant-treated and untreated plants was positively affected by increasing N rates from 0 to 20 kg N·ha−1, reaching a plateau thereafter indicating luxury N conditions at 30 kg N·ha−1. However, high N fertilizer application (20 and especially 30 kg N·ha−1) resulted in undesirable decreases in antioxidant activities and total ascorbic acid (TAA). Under non-fertilized regimens, foliar PBs application boost growth and yield of baby lettuce in comparison to non-treated plants. Foliar spray with LDPH and especially SwE elicited significant increases in marketable fresh yield (averaging 14%, 6% and 7% at 10, 20 and 30 kg N·ha−1, respectively) compared to TPE and untreated plants. Improved agronomical performance of baby lettuce under optimal (10 kg N ha−1) and especially suboptimal N regimens (0 kg N ha−1) was associated with increasing photochemical efficiency and a better activity of photosystem II (higher Soil Plant Analysis Development-SPAD index and chlorophyllous pigments biosynthesis). The application of LDPH enhanced antioxidant capacity and TAA in baby lettuce leaf and did not increased nitrate content as recorded in SwE and TPE treatments. Overall, plant biostimulants may be considered as a sustainable tool of production to increase leafy vegetable productivity in low fertility soils.

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Effect of Seaweeds on Growth and Yield of Boro Rice (Oryza sativa L.)

Current Journal of Applied Science and Technology ◽

10.9734/cjast/2020/v39i3331015 ◽

2020 ◽

pp. 28-34

Author(s):

Madhusri Pramanik ◽

Dhananjoy Dutta ◽

Indranil Samui

Keyword(s):

West Bengal ◽

Foliar Application ◽

Oryza Sativa L ◽

Block Design ◽

Foliar Spray ◽

Seaweed Extract ◽

Growth And Yield ◽

Cost Ratio ◽

Residual Soil ◽

Boro Rice

Introduction: Seaweed extract, an organic bio-stimulant has emerged as a promising tool for increasing crop growth and yield without affecting soil health and environment. Aim: i) To study the efficacy of seaweed extract on growth and yield of boro rice ii) To evaluate the nutrients uptake and residual soil fertility under different treatments iii)To assess the economic viability of using the bio-stimulants in rice production. Study Design: Seven treatments were laid out inrandomized block design with three replications. Place and Duration of the Study: Boro seasons of 2016-17 and 2017-18 at Instructional Farm of BCKV, Nadia, under new alluvial zone of West Bengal. Methods: Field experiment was carried out in boro (summer) rice (cv. Satabdi) with seven treatments viz., T1-100% RDF (120:60:60 kg/ha N, P2O5 and K2O), T2-100% RDF+ biozyme liquid @ 2.5ml/l of water (seed soaking), T3-100% RDF + biozyme liquid @ 10ml/l of water (root dipping), T4- 100% RDF+ biozyme granule @15 kg/ha (soil application at 15 and 45 DAT)+ liquid @ 625 ml/ha (foliar spray at 15 and 45 DAT), T5-75% RDF + biozyme liquid, T6-75% RDF+ biozyme granule+ liquid and T7-75% RDF+ amaze-X granule @ 10kg/ha at 45 DAT + biozymegranule + liquid. Results: Results revealed that the maximum grain yield (4.88 t/ ha) was obtained under T7 followed by T4 and T6, however, the net return (Rs.25576/ha) and benefit-cost ratio (1.51) of T6 treatment gave maximum. Conclusion: It may be concluded that T7 treatment performed best in terms of growth and yield of Boro rice but T6 treatment gave the highest B:C ratio and net income which is supposed to be more economical to the small and marginal farmers. Therefore, integrated use of 75% RDF and biozyme soil & foliar application can be recommended for boro rice under new alluvial zone of West Bengal.

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Improvement of antioxidant activities and yield of spring maize through seed priming and foliar application of plant growth regulators under heat stress conditions

Semina Ciências Agrárias ◽

10.5433/1679-0359.2017v38n1p47 ◽

2017 ◽

Vol 38 (1) ◽

pp. 47 ◽

Cited By ~ 2

Author(s):

Ijaz Ahmad ◽

Shehzad Maqsood Ahmed Basra ◽

Muhammad Akram ◽

Allah Wasaya ◽

Muhammad Ansar ◽

...

Keyword(s):

Heat Stress ◽

Grain Yield ◽

Foliar Application ◽

Antioxidant Activities ◽

Foliar Spray ◽

Seed Priming ◽

Chlorophyll Contents ◽

Exogenous Application ◽

Hybrid Maize

Heat stress during reproductive and grain filling phases adversely affects the growth of cereals through reduction in grain’s number and size. However, exogenous application of antioxidants, plant growth regulators and osmoprotectants may be helpful to minimize these heat induced yield losses in cereals. This two year study was conducted to evaluate the role of exogenous application of ascorbic acid (AsA), salicylic acid (SA) and hydrogen peroxide (H2O2) applied through seed priming or foliar spray on biochemical, physiological, morphological and yield related traits, grain yield and quality of late spring sown hybrid maize. The experiment was conducted in the spring season of 2007 and 2008. We observed that application of AsA, SA and H2O2 applied through seed priming or foliar spray improved the physiological, biochemical, morphological and yield related traits, grain yield and grain quality of late spring sown maize in both years. In both years, we observed higher superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) activity in the plants where AsA, SA and H2O2were applied through seed priming or foliar spray than control. Membrane stability index (MSI), relative water contents (RWC), chlorophyll contents, grain yield and grain oil contents were also improved by exogenous application of AsA, SA and H2O2 in both years. Seed priming of AsA, SA and H2O2was equally effective as the foliar application. In conclusion, seed priming with AsA, SA and H2O2 may be opted to lessen the heat induced yield losses in late sown spring hybrid maize. Heat tolerance induced by ASA, SA and H2O2 may be attributed to increase in antioxidant activities and MSI which maintained RWC and chlorophyll contents in maize resulting in better grain yield in heat stress conditions.

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EFFECT OF FOLIAR APPLICATION OF VERMIWASH ON GROWTH AND QUALITY OF BRINJAL

Journal of Wastes and Biomass Management ◽

10.26480/jwbm.01.2021.31.34 ◽

2020 ◽

Vol 3 (1) ◽

pp. 31-34

Author(s):

M. Yasmin ◽

M.S. Rahman ◽

M.A. Rahman ◽

F.S. Shikha ◽

M.K. Alam

Keyword(s):

Agricultural Research ◽

Foliar Application ◽

Foliar Spray ◽

Growth Yield ◽

Nutrient Content ◽

Growth And Yield ◽

Control Treatment ◽

Research Station ◽

Water Control

The experiment was conducted at Regional Agricultural Research Station (RARS), Jamalpur, Bangladesh during the period of 2019-2020 and 2020-2021 to investigate the effect of vermiwash on growth, yield and quality of brinjal and to find out suitable foliar dose of vermiwash for optimizing the yield of brinjal. There were five treatments comprising T1= Chemical fertilizer (CF) + foliar spray of distilled water (control), T2 = CF + foliar spray of 10% vermiwash, T3 = CF + foliar spray of 20% vermiwash, T4 = CF + foliar spray of 30% vermiwash and T5= CF + foliar spray of 40% vermiwash. Results revealed that, vermiwash treated brinjal plants showed better growth and yield parameters than the control plants. The highest average brinjal fruit yield (29.99 t ha-1) was found in T3 treatment i.e., foliar spray of 20% concentration of vermiwash and the lowest (26.35 t ha-1) came from control. On the other hand, nutritional quality (moisture content, TSS, β carotene and nutrient content) were seen to be higher in vermiwash treated treatment compared to control treatment. The study suggests that, 20% concentration of vermiwash could be used as effective foliar spray for eco-friendly and higher yield of brinjal.

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Relief Role of Lysine Chelated Zinc (Zn) on 6-Week-Old Maize Plants under Tannery Wastewater Irrigation Stress

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17145161 ◽

2020 ◽

Vol 17 (14) ◽

pp. 5161

Author(s):

Rehan Ahmad ◽

Wajid Ishaque ◽

Mumtaz Khan ◽

Umair Ashraf ◽

Muhammad Atif Riaz ◽

...

Keyword(s):

Amino Acids ◽

Amino Acid ◽

Plant Growth ◽

Foliar Application ◽

Antioxidant Activities ◽

Foliar Spray ◽

Tannery Wastewater ◽

Organic Load ◽

Maize Plants

Tannery wastewater mainly comes from leather industries. It has high organic load, high salinity, and many other pollutants, including chromium (Cr). Tannery wastewater is generally used for crop irrigation in some areas of Pakistan and worldwide, due to the low availability of good quality of irrigation water. As tannery wastewater has many nutrients in it, its lower concentration benefits the plant growth, but at a higher concentration, it damages the plants. Chromium in tannery wastewater accumulates in plants, and causes stress at physiological and biochemical levels. In recent times, the role of micronutrient-amino acid chelated compounds has been found to be helpful in reducing abiotic stress in plants. In our present study, we used lysine chelated zinc (Zn-lys) as foliar application on maize (Zea mays L.), growing in different concentrations of tannery wastewater. Zinc (Zn) is required by plants for growth, and lysine is an essential amino acid. Maize plants were grown in tannery wastewater in four concentrations (0, 25%, 50%, and 100%) and Zn-lys was applied as a foliar spray in three concentrations (0 mM, 12.5 mM, and 25 mM) during plant growth. Plants were cautiously harvested right after 6 weeks of treatment. Foliar spray of Zn-lys on maize increased the biomass and improved the plant growth. Photosynthetic pigments such as total chlorophyll, chlorophyll a, chlorophyll b and contents of carotenoids also increased with Zn-lys application. In contrast to control plants, the hydrogen peroxide (H2O2) contents were increased up to 12%, 50%, and 68% in leaves, as well as 16%, 51% and 89% in roots at 25%, 50%, and 100% tannery water application, respectively, without Zn-lys treatments. Zn-lys significantly reduced the damages caused by oxidative stress in maize plant by decreasing the overproduction of H2O2 and malondialdehyde (MDA) in maize that were produced, due to the application of high amount of tannery wastewater alone. The total free amino acids and soluble protein decreased by 10%, 31% and 64% and 18%, 61% and 122% at 25%, 50% and 100% tannery water treatment. Zn-lys application increased the amino acids production and antioxidant activities in maize plants. Zn contents increased, and Cr contents decreased, in different parts of plants with Zn-lys application. Overall, a high concentration of tannery wastewater adversely affected the plant growth, but the supplementation of Zn-lys assertively affected the plant growth and enhanced the nutritional quality, by enhancing Zn and decreasing Cr levels in plants simultaneously irrigated with tannery wastewater.

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The effect of foliar application of seaweed extract on potato

Agricultural and Food Science ◽

10.23986/afsci.72367 ◽

1989 ◽

Vol 61 (5) ◽

pp. 371-377

Author(s):

Paavo Kuisma

Keyword(s):

Foliar Application ◽

Growing Season ◽

The Other ◽

Seaweed Extract ◽

Growth And Yield ◽

Tuber Initiation ◽

Long Day ◽

Potato Growth ◽

Commercial Seaweed Extract ◽

Short Growing Season

The effect of foliar application of commercial seaweed extract on potato growth was studied in long-day conditions (60° 10' N 25°00' E) characterized by a cool and short growing season. The results showed that neither the doses, 0, 5, 10, 20 l/ha nor the spraying 24, 45, 58 days after the emergence had any remarkable influence on potato growth and yield if the other preconditions of production are in order. Only small, although insignificant benefit could be obtained with application done three weeks after emergence, clearly before tuber initiation.

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Strigolactone and Ethylene Inhibitor Suppressing Dark-induced Leaf Senescence in Perennial Ryegrass Involving Transcriptional Downregulation of Chlorophyll Degradation

Journal of the American Society for Horticultural Science ◽

10.21273/jashs04933-20 ◽

2021 ◽

pp. 1-8

Author(s):

Qiannan Hu ◽

Fei Ding ◽

Mingna Li ◽

Xiaxiang Zhang ◽

Shuoxin Zhang ◽

...

Keyword(s):

Leaf Senescence ◽

Perennial Ryegrass ◽

Foliar Application ◽

Chlorophyll Biosynthesis ◽

Photochemical Efficiency ◽

Foliar Spray ◽

Ethylene Biosynthesis ◽

Chlorophyll Degradation ◽

Ethylene Inhibitor ◽

Premature Leaf Senescence

Accelerated or premature leaf senescence induced by dark conditions could be associated with chlorophyll degradation and regulated by hormones. To study the effects of strigolactone (SL) on dark-induced leaf senescence and to examine the interaction effects of SL and ethylene on regulating dark-induced leaf senescence, plants of perennial ryegrass (Lolium perenne) exposed to darkness for 8 days were treated with a synthetic SL analogue (GR24), aminoethoxyvinyl glycine [AVG (an ethylene biosynthesis inhibitor)], or SL and AVG by foliar spray. Chlorophyll content, photochemical efficiency, electrolyte leakage, and ethylene production were measured. Expressions of genes associated with leaf senescence, SL biosynthesis and signaling, ethylene biosynthesis and signaling, and chlorophyll biosynthesis and degradation were determined. Foliar application of GR24 promoted leaf senescence in perennial ryegrass grown in darkness, and the intensity of action increased with the GR24 concentration. SL-accelerated leaf senescence was associated with the downregulation of four chlorophyll biosynthesis-associated genes and upregulation of four chlorophyll degradation-associated genes. AVG had functions counteractive to SL, suppressing dark-induced leaf senescence by downregulating chlorophyll degradation genes and SL synthesis genes. Our results suggested that SL and ethylene interactively regulated leaf senescence, mainly by controlling chlorophyll degradation induced by darkness in perennial ryegrass.

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Foliar Application of Protein Hydrolysates on Baby-Leaf Spinach Grown at Different N Levels

Agronomy ◽

10.3390/agronomy12010036 ◽

2021 ◽

Vol 12 (1) ◽

pp. 36

Author(s):

Anna Bonasia ◽

Giulia Conversa ◽

Corrado Lazzizera ◽

Antonio Elia

Keyword(s):

Photosynthetic Activity ◽

Foliar Application ◽

N Uptake ◽

Protein Hydrolysates ◽

Growth And Yield ◽

N Availability ◽

Nitrate Accumulation ◽

N Assimilation ◽

N Rates ◽

N Use

Surpluses of N are associated with environmental and health problems. To optimise N use and reduce nitrate accumulation in leafy species like spinach, the application of biostimulants is suggested. An experiment in controlled conditions (growth chamber/soilless) evaluated baby-spinach responses to two protein hydrolysates (PHs) from plant (legume, Trainer®) and animal (meat, Isabion®) sources, combined with three N rates: 2 (N2, deficient), 8 (N8, sub-optimal), and 14 (N14, optimal) mM of N. Biometrical and morphological traits of shoots and roots as well as the physio-metabolic (gas exchange, N assimilation, and NUtE), physical, mineral, and antioxidant profiles of leaves were assessed. The legume-PH boosts growth and yield only at the highest N conditions, while there was no effect at lower N rates. The legume-PH modulates root architecture and chlorophylls has positive responses only at optimal N availability, such as an increase in N uptake, leaf expansion, and photosynthetic activity at the canopy level. The PHs do not improve NUtE, leaf colour, consistency, cations, or antioxidants. Neither do PHs have any effect on reducing nitrate accumulation. Legume-PH improves N assimilation only at optimal N availability, while meat-PH does not, reaching the highest nitrate value at the highest N rate (2677 mg kg−1 fw), even if this value is under the EC limits for fresh spinach.

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A Rice Variety (BRRI dhan29) Yield Performance as Influenced by Foliar Application of Salicylic Acid in Bangladesh

Agricultural Science ◽

10.30560/as.v2n1p263 ◽

2020 ◽

Vol 2 (1) ◽

pp. p263

Author(s):

Shahnaz Parveen ◽

Mohammad Issak ◽

Md. Sohanur Rahman ◽

Fakhar Uddin Talukder ◽

Shanta Islam

Keyword(s):

Salicylic Acid ◽

Grain Yield ◽

Biomass Production ◽

Foliar Application ◽

Block Design ◽

Rice Variety ◽

Foliar Spray ◽

Growth And Yield ◽

Control Treatment ◽

Yield Performance

Objective of this study was to examine and evaluate the role of different rates of salicylic acid (SA) as foliar spray on growth and yield performance of BRRI dhan29. The experiment was conducted at Sher-e-Bangla Agricultural University, Bangladesh from November, 2016 to May, 2017 following a randomized complete block design with five rates of SA in six replications. The results showed that the lower rate of SA (upto 0.75 mM) has a positive effect on rice biomass production including effective tiller per hill, filled grain per panicle, grain yield and straw yield. The highest dry matter production at both maximum tillering and panicle initiation stages was found at SA spray rate of 0.5 mM. The highest number of effective tillers per hill (14.7) as well as the highest filled grain (120.4) and grain yield (8.1 t/ha) were found at SA rate of 0.75 mM. However, the maximum biomass production was obtained at SA rate of 0.25 mM. The minimum grain yield (7.0 t/ha) was observed in the control treatment.

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Comparative Response of Huanglongbing-Affected Sweet Orange Trees to Nitrogen and Zinc Fertilization under Microsprinkler Irrigation

Agriculture ◽

10.3390/agriculture10100489 ◽

2020 ◽

Vol 10 (10) ◽

pp. 489

Author(s):

Qudus O. Uthman ◽

Davie M. Kadyampakeni ◽

Peter Nkedi-Kizza ◽

Neriman T. Barlas ◽

Alisheikh A. Atta ◽

...

Keyword(s):

Foliar Application ◽

Growth Parameters ◽

Soil Depth ◽

Foliar Spray ◽

Fruit Weight ◽

Soil Application ◽

Zn Concentration ◽

Canopy Volume ◽

Application Methods ◽

N Rates

Nitrogen and micronutrients have a key role in many citrus plant enzyme reactions. Although enough micronutrients may be present in the soil, deficiency can develop due to soil depletion or the formation of insoluble compounds. The objectives of this study were to (1) determine the adsorption, distribution, and availability of Zn in a sandy soil; (2) compare the effectiveness of foliar and soil application methods of Zn on Huanglongbing [HLB] affected trees; (3) compare foliar application rates of Zn for HLB-affected trees; (4) determine the effect of N rates on yield, soil inorganic N distribution patterns, and tree growth parameters. Tree rows were supplied with three N rates of 168, 224 and 280 kg·N·ha−1 and Zn at single and double recommended rates (recommended rate = 5.6 kg·Zn·ha−1) using foliar and soil application methods, in a split-plot experimental design. The results show that Zn concentration in the 0–15 cm soil depth was three times higher than the 30–45 and 45–60 cm soil depths during the study. An adsorption study revealed high Zn (KD = 6.5) sorption coefficients at 0–15 cm soil depth, while 30–45 and 45–60 cm depths showed little sorption. Leaf Zn concentration for foliar spray was two times higher than the soil application method. A nitrogen level of 224 kg N ha−1 improved canopy volume when compared to other N levels at the expense of reduced fruit weight. Foliar Zn application at 5.6 or 11.2 kg ha−1 and N rate at 224 kg ha−1 appear to be adequate for improving the performance of HLB-affected citrus trees.

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Response of potassium nitrate on yield and yield contributing characters of boro rice cv. BRRI dhan28

International Journal of Multidisciplinary Perspectives ◽

10.18801/ijmp.010120.02 ◽

2020 ◽

Vol 01 (01) ◽

pp. 05-13

Author(s):

M. Hasan ◽

M. B. Akter ◽

M. M. Karim ◽

F. Yasmine ◽

A. K. Hasan

Keyword(s):

Grain Yield ◽

Foliar Application ◽

Block Design ◽

Foliar Spray ◽

Potassium Nitrate ◽

Growth And Yield ◽

Growth Stages ◽

Yield Production ◽

Initiation Stage ◽

Boro Rice

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, to explore the growth and yield performance of boro rice cv. BRRI dhan28 is influenced by foliar spray of potassium nitrate (KNO3) at four rice growth stages. The experiment consisted of four doses of KNO3 viz. 0 (Control), 0.25, 0.50 and 1.00 kg ha−1 and applied at four growth stages of rice development viz. at panicle initiation, at ear emergence, at anthesis period and at dough stage. This experiment was carried out in Randomized Complete Block Design (RCBD) with three replications with 10 m2 (4.0 m × 2.5 m) unit plot size and spacing between blocks and unit plots was 1 m and 0.5 m, respectively. Results revealed that foliar application of potassium nitrate at four growth stages significantly affected yield and yield contributing characters of BRRI dhan28. But most of the yield contributing characters did not differ significantly due to the interaction between potassium nitrate and stage of foliar spray. However, the foliar application of KNO3 @ 0.25 kg ha−1 showed the highest yield production (5.86 kg ha−1) while the lowest yield (4.85 kg ha−1) was found in control. Furthermore, better yield performances were recorded when the KNO3 was applied at panicle initiation stage rather than the other four growth stages. The total number of tillers, 1000–grain weight and grain yield, was higher with foliar spraying of a 0.25 kg ha−1 KNO3 at panicle initiation stage. From this experiment, it may be concluded that foliar application of KNO3 affected the yield performances of BRRI dhan28 and 0.25 kg ha−1 KNO3 produced the highest grain yield when applied at panicle initiation stage of boro rice.

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