Abstract
Relevance. Plant growth biostimulants based on natural raw materials are ecologically safe and harmless to humans. Stevia (Stevia rebaudiana Bertoni) contains in its leaves sweet diterpene steviol glycosides, which are similar in structure and properties to gibberellins, as well as a number of other valuable biologically active compounds. Water extracts from stevia leaves are capable to accelerate growth, to increase the yield and quality of plants. However, further study and development of application technologies of the extracts for specific crops and different growing conditions are required. The purpouse of this work is to investigate the effect of an aqueous extract from stevia leaves on the yield and quality of lettuce and small radish under photoculture conditions. Materials and methods. The objects of the study were lettuce var. Typhoon and small radish var. Riesenbutter. The plants were grown in photoculture at the biopolygon of the FSBSI Agrophysical Research Institute (St. Petersburg) at an illumination of 10–20 klx, a temperature of 22–26°С (day) and 18–20°С (night). Watering was carried out with water, top-dressing was carried out with Knop's nutrient solution three times a week. Peat with mineral additives was used as a substrate. The original extract was prepared by extraction from stevia dry leaves powder with hot water (80°С) in a ratio of 1 g of leaves: 100 ml of water. Foliar treatment of plants was carried out twice at dilution of the original extract from stevia leaves 1:10, 1:50, and 1:100 (extract : water) at the rate of 0.20-0.25 ml / lettuce plant and 0.09-0.1 ml / radish plant; control plants were treated with water. The data were processed according to standard procedures using the Excel 2016 software. Results. Foliar treatment with an extract from stevia leaves did not significantly affect the size and weight of radish root crops, but increased the yield due to a decrease in the number of bolting plants. A significant decrease of bolting was observed in all treatment options (by 34-51%). When using a dilution of 1: 100, the yield of marketable root crops increased by 20% and the yield per sq. m. – by 25%. Foliar treatment with stevia extracts increased the mass of lettuce plants, as well as their biological value. The content of photosynthetic pigments, sugars, and vitamin C significantly increased, and a tendency towards a decrease in the content of nitrates was observed. According to data, we recommend for foliar treatment are dilutions of the original extract 1:50 and 1: 100. The effect of using of an extract from stevia leaves is similar in action to some biostimulants from plants with hormone-like properties, which determines the possibility of using it as a safe plant growth stimulant.
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Claims 10
Claim · model-written summary
Foliar stevia leaf extract did not significantly affect the size and weight of radish root crops.
- Taxon
- radish
Raphanus sativuse1 - Treatment
- Foliar treatment with an extract from stevia leavese1
- Outcome
- size and weight of radish root cropse1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Foliar treatment with an extract from stevia leaves did not significantly affect the size and weight of radish root crops, but increased the yield due to a decrease in the number of bolting plants”
Claim · model-written summary
Foliar stevia leaf extract increased radish yield through fewer bolting plants.
- Taxon
- radishRaphanus sativuse1
- Treatment
- Foliar treatment with an extract from stevia leavese1
- Outcome
- yielde1
- Direction
- increasede1
- Qualifier
- due to a decrease in the number of bolting plantse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Foliar treatment with an extract from stevia leaves did not significantly affect the size and weight of radish root crops, but increased the yield due to a decrease in the number of bolting plants”
Claim · model-written summary
Foliar stevia leaf extract significantly decreased bolting of radish by 34-51% in all treatment options.
- Taxon
- radishRaphanus sativuse2
- Treatment
- treatment optionse1
- Outcome
- boltinge1
- Direction
- decreasee1
- Value
- 34-51%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A significant decrease of bolting was observed in all treatment options (by 34-51%)”
e2“Foliar treatment with an extract from stevia leaves did not significantly affect the size and weight of radish root crops”
Claim · model-written summary
Dilution 1:100 of the stevia leaf extract increased marketable radish root crop yield by 20%.
- Taxon
- radishRaphanus sativuse2
- Treatment
- dilution of 1: 100e1
- Outcome
- yield of marketable root cropse1
- Direction
- increasede1
- Value
- 20%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“When using a dilution of 1: 100, the yield of marketable root crops increased by 20% and the yield per sq. m. – by 25%”
e2“Foliar treatment with an extract from stevia leaves did not significantly affect the size and weight of radish root crops”
Claim · model-written summary
Dilution 1:100 of the stevia leaf extract increased radish yield per square metre by 25%.
- Taxon
- radishRaphanus sativuse2
- Treatment
- dilution of 1: 100e1
- Outcome
- yield per sq. m.e1
- Direction
- increasede1
- Value
- 25%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“When using a dilution of 1: 100, the yield of marketable root crops increased by 20% and the yield per sq. m. – by 25%”
e2“Foliar treatment with an extract from stevia leaves did not significantly affect the size and weight of radish root crops”
Claim · model-written summary
Foliar stevia leaf extract increased the mass of lettuce plants and their biological value.
- Taxon
- lettuce
Lactuca sativae1 - Treatment
- Foliar treatment with stevia extractse1
- Outcome
- mass of lettuce plantse1
- Direction
- increasede1
- Qualifier
- as well as their biological valuee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Foliar treatment with stevia extracts increased the mass of lettuce plants, as well as their biological value”
Claim · model-written summary
Foliar stevia leaf extract significantly increased photosynthetic pigment, sugar and vitamin C content of lettuce.
- Taxon
- lettuceLactuca sativae2
- Treatment
- Foliar treatment with stevia extractse2
- Outcome
- content of photosynthetic pigments, sugars, and vitamin Ce1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The content of photosynthetic pigments, sugars, and vitamin C significantly increased”
e2“Foliar treatment with stevia extracts increased the mass of lettuce plants, as well as their biological value”
Claim · model-written summary
Foliar stevia leaf extract tended to decrease nitrate content of lettuce.
- Taxon
- lettuceLactuca sativae2
- Treatment
- Foliar treatment with stevia extractse2
- Outcome
- content of nitratese1
- Direction
- decreasee1
- Qualifier
- a tendency towardse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“and a tendency towards a decrease in the content of nitrates was observed”
e2“Foliar treatment with stevia extracts increased the mass of lettuce plants, as well as their biological value”
Claim · model-written summary
The authors recommend foliar application of the stevia leaf extract at 1:50 and 1:100 dilutions.
Verbatim
e1“on the yield and quality of lettuce and small radish under photoculture conditions”
e2“we recommend for foliar treatment are dilutions of the original extract 1:50 and 1: 100”
Claim · model-written summary
The authors conclude the stevia leaf extract can be used as a safe plant growth stimulant.
Verbatim
e1“on the yield and quality of lettuce and small radish under photoculture conditions”
e2“which determines the possibility of using it as a safe plant growth stimulant”
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