Tag Archives: biostimulants

939-955 A. Sarov, K. Kostenarov and E. Tzvetanova
An optimization model for evaluating the economic effect of foliar treatment with biostimulants on spring rape
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An optimization model for evaluating the economic effect of foliar treatment with biostimulants on spring rape

A. Sarov¹*, K. Kostenarov² and E. Tzvetanova³

¹Institute of Agricultural Economics, Agricultural Academy, Department ‘Economics and Management of Agriculture, Food and Agrarian Policy’, Str., ‘Tsarigradsko shose’ No 125, block 1, BG1113 Sofia, Bulgaria
²New Bulgarian University, Department ‘Economics’, Ovcha Kupel 2, 21 Montevideo Blvd, BG1618 Sofia, Bulgaria
³New Bulgarian University, Department ‘Administration and Management’, Ovcha Kupel 2, 21 Montevideo Blvd, BG1618 Sofia, Bulgaria
*Correspondence: angel.sarov@gmail.com

Abstract:

The aim of the study is to evaluate the economic effect of foliar treatment with biostimulants: chitosan, vermicompost and vermicompost + nature-identical growth regulator on organic production of spring rape on organic production of spring rape. Two-years field trials were conducted using a block method with foliar treatment in 2 phenological phases (in rosette and flowering phase). The biological response of the culture at different doses of the biostimulators was investigated. The obtained primary results were used as input data for the construction of an economic-mathematical model for economic evaluation The treatment of spring rape with biostimulators has a positive effect on the yield of the crop. After that, a specific agricultural holding in the region is selected, which will serve as a model on which to construct the optimization model for evaluating the economic efficiency. In this farm, along with the intended crops in the production structure, spring canola is added – controls and treated with BS. The results are optimal after using chitosan in a dose of 500 mL daa^-1. The results of this research show the economic benefits of using biostimulants, which are extremely important for farmers. They are an alternative to the requirements of the European Union’s Green Deal At the heart of the Green Deal is the Farm to Fork (F2F) and the ‘Biodiversity Strategy’ (BS) strategy, which was launched by the European Commission in May 2020 to achieve a fair, healthy and sustainable food system by 2030. Under the F2F strategy, there is a need to reduce reliance on pesticides and antimicrobials, reducing excess fertilization, increasing areas for organic farming, improving animal welfare and reducing biodiversity loss. With the announcement of the goals and intentions of the Green Deal and its manifestations in agriculture, preparations also began for preliminary assessments of the consequences and impact that it will have on the entire food chain and for its transposition into the Common Agricultural Policy. At the same time, science research on alternatives to traditional conventional technologies is increasing. The results of the studies also took into account a set of assumptions for simulations of farm incomes, production and product prices.

Key words:

biostimulants, economic effect, optimization model, spring rape

703-711 R.K.S. Silva, P.F.M. da Silva, L.M. Nascimento, T.A.N. de Araújo and E.P. Vendruscolo
How do rhizobacteria species influence the growth and yield of soybean in a tropical environment?
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How do rhizobacteria species influence the growth and yield of soybean in a tropical environment?

R.K.S. Silva¹, P.F.M. da Silva¹, L.M. Nascimento¹, T.A.N. de Araújo² and E.P. Vendruscolo³*

¹UniEVANGÉLICA - Universidade Evangélica de Goiás, Universitária Avenue, km. 3.5, 75083-515, Anápolis, Brazil
²Universidade Federal de Pelotas, Eliseu Maciel Avenue, 96010-610, Capão do Leão, Brazil
³Universidade Estadual de Mato Grosso do Sul, MS 306 Rd., km 6.4, 79540-000, Cassilândia, Brazil
*Correspondence: agrovendruscolo@gmail.com

Abstract:

The application of rhizobacteria has gained space in agricultural production, given the demand for more sustainable systems. However, most of the results obtained are related to soil or seed application, leaving a gap in relation to the foliar application of these microorganisms. The objective of this work was to evaluate the impact of foliar application of different types of growth-promoting rhizobacteria on morphological aspects and production components of soybean. For this, the foliar application of four rhizobacteria (Serratia sp.; Bacillus subtilis; Bacillus sp.; Pseudomonas fluorescens) was used, as well as a control without inoculation. Morphological variables of growth and production components were analyzed. The yield ratio of the treatments with rhizobacteria, concerning the control was also calculated. The foliar application with different rhizobacteria in soybean did not affect the vegetative parameters of plant height, stem diameter and dry weight of the canopy. For the number of pods per plant, number of grains per plant and grain yield the use of Bacillus sp. was superior to the other treatments, providing an average increase of 27.65%, 20.32% and 28.59%, respectively. Also, the Serratia sp., Bacillus subtilis and Pseudomonas fluorescens application increased the grain yield by 8.49%, 10.73% and 5.71%, respectively. In conclusion, for the condition of the tropical region where this study was conducted, the foliar application with different growth-promoting rhizobacteria in soybean did not interfere in the vegetative development of soybean plants. In addition, considering the factors related to the increase of production in cultivated areas, all rhizobacteria have the potential to improve yield gains when applied as foliar treatment, especially the Bacillus sp.

Key words:

Bacillus sp., biological inputs, biostimulants, Glycine max, growth promotion, regenerative agriculture

793-804 Y.N. Sassine, T.K. Sajyan, A. El Zarzour, A.M.R. Abdelmawgoud, M. Germanos and S.M. Alturki
Integrative effects of biostimulants and salinity on vegetables: Contribution of bioumik and Lithovit®-urea50 to improve salt-tolerance of tomato
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Integrative effects of biostimulants and salinity on vegetables: Contribution of bioumik and Lithovit®-urea50 to improve salt-tolerance of tomato

Y.N. Sassine¹, T.K. Sajyan¹²*, A. El Zarzour¹, A.M.R. Abdelmawgoud³, M. Germanos¹ and S.M. Alturki⁴

¹Lebanese University, Faculty of Agriculture, Department of Plant Production, Beirut, Lebanon
²University of Forestry, Faculty of Agronomy, Department of Agronomy, 10 Kliment Ohridski blvd, BG1797 Sofia, Bulgaria
³National Research Center, Department of Vegetable Researches, Dokki, Cairo, Egypt
⁴King Faisal University, College of Agricultural and Food Sciences, Department of Arid Land Agriculture, P.O. Box 400, Al Ahsa 31982, Kingdom of Saudi Arabia
*Correspondence: tony.sajyan@st.ul.edu.lb

Abstract:

The separate and combined effect of lithovit-urea50 and bioumik was tested on salt-stressed tomato crops. Salinity was induced using three different NaCl solutions (2, 4 and 8 dS m^-1). Under the salinity effect, all aspects of plant growth were inhibited. Total chlorophyll and carotenoids reduced from mg g^-1 FW and 1.1 mg g^-1 FW at 2 dS m^-1 to reach 1.01 mg g^-1 FW and 0.66 mg g^-1 FW at 8 dS m^-1 in control plants. Plants treated by the combination of both products had the highest chlorophyll and carotenoids content with 2.24 mg g^-1 FW and 1.34 mg g^‑1 FW, 1.88 mg g^-1 FW and 1.05 mg g^-1 FW, and 1.39 mg g^-1 FW and 0.86 mg g^-1 FW respectively at 2, 4 and 8 dS m^-1. Treating plants by this combination maximized flower number, fruit weight, yield and fruit diameter at 2 dS m^-1 (17 flowers, 47.93 g, 431.1 g plant^-1 and 3.23 cm respectively) and 4 dS m^-1 (15flowers, 36.45 g, 291.85 g plant^-1 and 2.8 cm respectively). The separate application of bioumik minimized cell electrolyte leakage at 2 dS m^-1 (8.82%) compared to control (11.43%). Additionally, plants treated by lithovit-urea and bioumik had the highest relative water content with 107.3%, 96.5% and 91.2% respectively at 2, 4 and 8 dS m^-1. N, Ca and Mg in roots were significantly the highest at 2 dS m^-1 (4.5%, 2.6% and 0.5% respectively), at 4 dS m^-1 (3.74%, 2.49% and 0.48% respectively) and at 8 dS m^-1 (3.21%, 2.61% and 0.32% respectively). K content in roots was maximized following the separate application of bioumik with 3.21% at 2 dS m^-1 and 2.55% at 8 dS m^-1. Conclusively, lithovit-urea and bioumik helped plants in tolerating salt-stress with an optimal effect obtained after their combination.

Key words:

biostimulants, growth, physiology, salinity, small scale fertilizers, tomato