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Proceeding Paper

Foliar Application with Plant-Derived Extracts Enhances Growth, Physiological Parameters, and Yield of Potatoes (Solanum tuberosum L.) †

by
Siphokuhle Mbuyisa
1,
Isa Bertling
1,* and
Bonga Lewis Ngcobo
2
1
School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, P Bag X01, Pietermaritzburg 3209, South Africa
2
Department of Horticulture, Faculty of Applied Sciences, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa
*
Author to whom correspondence should be addressed.
Presented at the 3rd International Electronic Conference on Agronomy, 15–30 October 2023; Available online: https://iecag2023.sciforum.net/.
Biol. Life Sci. Forum 2023, 27(1), 34; https://doi.org/10.3390/IECAG2023-15385
Published: 27 October 2023
(This article belongs to the Proceedings of The 3rd International Electronic Conference on Agronomy)

Abstract

:
The current reliance on pesticides and synthetic fertilizers has been vital to sustain and even increase agricultural production. The continuous, excessive use of these traditional practices has negatively affected consumers’ health and burdened ecosystems. The use of plant extracts has the ability to improve plant growth and agricultural productivity. This study was, therefore, conducted to determine the effects of foliar plant extract application on potato growth, as well as on certain physiological and yield attributes. The treatments included extracts of the seaweed Ascophyllum nodosum, aloe vera leaves, garlic bulbs and moringa leaves. From four weeks after planting onwards, five healthy, equal-sized potato plants received 50 mL of the above-mentioned plant extracts as foliar applications. These treatments were repeated weekly until harvesting. Data on growth and physiological parameters were collected weekly. Pre-harvest foliar application of various plant extracts significantly enhanced (p ≤ 0.05) the plant growth and yield attributes of the potatoes. The best growth and yield responses were observed following ANE and MLE applications. A positive influence of various foliar plant extract applications on the growth and yield of potatoes was demonstrated. Further validation of the response of other crops is still necessary to promote the adoption of this approach.

1. Introduction

Potato (Solanum tuberosum L.) is a member of the Solanaceae family, native to South America, but is now grown in most parts of the world [1]. Amongst the cash crops, potatoes are one of the world’s most important non-grain food crops, with a global production of about 376 million tons, with China as the largest producer, contributing approximately 94 million tons annually [2]. Potatoes are also recognized as a staple food, being the third most-consumed food crop worldwide, following rice and wheat [1]. The worldwide per capita potato consumption reached 33.1 kg in 2020, which is possibly due to the health and nutritional benefits that potatoes offer [2]. According to Zaheer et al. [3], potatoes are an excellent source of dietary fiber, carbohydrates, high-quality protein, vitamins, minerals and other metabolites. Being rich in health-promoting metabolites, potatoes possess high antioxidant activities, which help to reduce the risk of chronic diseases, including heart disease, diabetes and cancer [4].
In recent decades, there has been a rapid increase in potato demand. For all potato growers, it has, therefore, become of immense importance to produce this crop profitably, at a minimum input cost. Additionally, modern agriculture demands sustainable crop production, searching for alternative methods to sustain plant development with little or no compromise to yield. Potato farmers are facing a major challenge of biotic and abiotic factors aligned with climate change. These include drought, salinity, weed infestation, pests and diseases, which can all devastatingly affect the growth and yield of potatoes [5]. Given these challenges, synthetic pesticides and inorganic fertilizers have become vital for the production of crops and their protection against biotic and abiotic constraints [6]. The current reliance on industrially based inputs may, however, pose multiple threats to human health and impart harmful effects on the ecosystem [7]. In addition, Lucas et al. [8] revealed that the continuous, excessive usage of such chemicals might result in the development of new pathogen strains that could become difficult to control, despite the efficacy of the chemical. The aim of modern plant agriculture is, therefore, to reduce the utilization of these chemicals to a minimum, thus making crop farming simpler and offering healthier, safer and sustainably produced goods.
Farmers are, therefore, continuously exploring and developing alternative approaches to crop farming as they try to overcome the challenges of long-term production viability [7]. Among the several proposed strategies, the use of plant extracts has been identified as a promising, innovative, eco-friendly and sustainable approach that could improve crop production and crop protection. Recent studies have tested this method on a broad spectrum of solanaceous crops, such as potatoes [9], sweet peppers (Capsicum annuum L.) [10] and tomatoes (Solanum lycopersicum L.) [11,12]. The present study, therefore, aims to evaluate the influence of foliar application of plant extracts on the growth and certain physiological and yield attributes of potatoes.

2. Materials and Methods

2.1. Plant Material and Growing Conditions

A pot experiment was performed in a glasshouse at the Controlled Environment Facility (CEF) of the University of KwaZulu-Natal, Pietermaritzburg, South Africa (29°37′32.9″ S 30°24′18.8″ E). The environmental conditions inside the glasshouse were maintained at 25 ± 2 °C and 65% relative humidity (RH) during the day, while the temperature and RH were kept constant at 13 ± 2 °C and 72% at night, respectively. Locally purchased baby potatoes, cv. ‘Sifra’, were planted as seed tubers at a depth of 10 cm into 10 L plastic pots filled with a mixture of sandy soil and Gromor® (Gromor, Cato Ridge, South Africa) potting mix. The plants were irrigated using an automated drip irrigation system, dispensing approximately 50 mL per 10 L pot daily.

2.2. Experimental Design

This study was laid out following a completely randomized design (CRD) with five replications. Five healthy, similar-sized ‘Sifra’ sprouted baby potatoes, randomly selected, were used per treatment, with five seed tubers per replicate, giving 25 experimental units (10 L pots). The experiment consisted of four treatments, namely ANE (brown algae Ascophyllum nodosum extract), MLE (moringa leaf extract), GBE (garlic bulb extract) and AVE (aloe vera leaf extracts), plus the control (no extract application). The above-mentioned treatments were directly applied to the potato leaves using a hand-held pressure sprayer, and each plant received 50 mL. The first foliar application of the treatments was performed four weeks after planting (vegetative stage), and the treatment applications were repeated weekly until harvest.

2.3. Extract Preparation

The plant materials used for the extract preparations were obtained from various suppliers. Brown algae (Ascophyllum nodosum) powder (Nature’s Choice) was bought locally (Dis-Chem, Woodburn Mall, Pietermaritzburg, South Africa), whereas healthy aloe vera plants were bought locally from Woodland nursery, (Pietermaritzburg, South Africa). Fresh moringa (Moringa oleifera) leaf powder (MLP) was supplied by a commercial supplier (runKZN, Pietermaritzburg, South Africa), while fresh Egyptian white garlic was bought from a local supermarket. The extracts used, ANE, AVE, MLE and GBE, were prepared following the procedure described in reference [12], with slight modifications.

2.4. Determination of Vegetative Growth and Certain Physiological and Yield Parameters

  • Plant height, number of leaflets and number of leaves
Plant growth parameters, including the plant height and the number of fully expanded leaves and leaflets, were recorded from the first treatment application until the tuber bulking stage of potato growth and development at 7-day intervals. Plant height (cm) was measured from the base of the stem to the tip of the terminal bud using a tape measure. The number of leaves and leaflets were counted manually.
  • Leaf area
From the first treatment application until the tuber bulking stage, the leaf area of the entire potato plant was estimated directly from leaf length and width measurements. The leaf area was then calculated using the formula described in reference [13]:
LA = 11.98 + 0.06 L × W,
where LA = leaf area (cm2), L = leaf length (cm) and W = leaf width (cm).
  • Leaf chlorophyll content index
The leaf chlorophyll content index was determined using a portable, non-destructive and lightweight instrument (CCM-200plus—Opti-Sciences Inc., Hudson, NH, USA). At the tuber bulking stage, a total of four plants, randomly selected from each treatment, were measured.
  • Yield and fresh tuber mass
At the mature tuber stage, all the tubers were harvested from all the replicates. The total tuber yield (tuber number/plant) and tuber mass (g) were recorded immediately after harvesting.
  • Statistical analysis
The results obtained were subjected to a one-way analysis of variance (ANOVA) using GenStat statistical software (GenStat®, 18th edition, VSN International, Hemel Hempstead, UK). Means separation was performed using Duncan’s multiple range test with at a 5% (p ≤ 0.05) significance level.

3. Results

The plant extracts were able to improve the growth and certain physiological and yield attributes of the potatoes (Table 1). The growth parameters, including the plant height, number of leaves and leaflets as well as leaf area, were significantly increased (p ≤ 0.05) by plant extract foliar application, with the ANE and MLE treatments showing an outstanding and significant performance (Table 1). Consequently, these two treatments yielded the tallest plants (28.56 and 27.60 cm, respectively) and a higher number of leaflets (51.6 and 55, respectively), number of leaves (15.13 and 15.87, respectively) and larger leaf area (89.89 and 84.01 cm2/cm2, respectively) compared to the AVE, GBE and the control (Table 1). The physiological response of the potato plants was positively influenced by foliar application of the plant extracts, especially ANE, AVE and MLE; hence, a higher leaf chlorophyll content index (34.45, 34.89 and 33.88, respectively) than the GBE and the control was recorded (Table 1). Foliar application of the plant extract also had a considerable effect on the potato yield parameters, particularly the total tuber yield and the fresh tuber mass. The ANE notably had a pronounced effect on the yield attributes, producing more yield (10.00) with a heavier fresh mass (177.90 g) than the other treatments using AVE, GBE, or the control (Table 1).

4. Discussion

The enhanced vegetative growth, physiological and yield attributes could be due to the biofertilization and biostimulatory effect of the plant extracts [10]. The biofertilization and biostimulatory effects of ANE and MLE have been previously reported for potatoes [9], sweet peppers (Capsicum annuum L.) [10] and tomatoes (Solanum lycopersicum L.) [12]. Both ANE and MLE are excellent sources of minerals, including the following macro- and micro-nutrients: N, P, K, Ca, Mg, Zn and Na [14]. The presence of such minerals in the extracts increases nutrient availability, especially N, P, K, Mg and Zn, to the plant, boosting vegetative growth and physiological and yield attributes [15]. In addition to minerals, growth, physiological and yield promotion by ANE and MLE could also be ascribed to their bio-stimulatory effects, due to the presence of phytohormones such as auxins [indole-3-acetic acid (IAA)], gibberellins (GAs) and cytokinins (zeatin) [15,16]. The presence of such growth-promoting plant hormones in ANE and MLE could possibly induce the biosynthesis of endogenous plant hormones. Application of ANE and MLE, therefore, can modulate physiological processes, including cell expansion through cell division and cell elongation, resulting in vegetative growth and yield promotion (Table 1), as observed by Rayorath et al. [15] in Arabidopsis thaliana (L.). Enhanced leaf chlorophyll content following MLE and ANE application could possibly be due to enhanced gene transcripts involved in photosynthesis, cell metabolism and stress responses. Application of ANE and MLE suppresses cysteine protease activity [17], which ultimately results in the inhibition of chlorophyll degradation, thus delaying senescence in plants (Table 1).
In addition, ANE and MLE contain several antioxidant compounds, including ascorbic acid, tocopherols, flavonoids and polyphenol. Their presence triggers antioxidant biosynthesis, thereby reducing stress caused by reactive oxygen species (ROS) [18]. These ROS can cause cell and membrane degradation; hence, the antioxidant compounds found in ANE and MLE could promote growth and developmental processes by reducing ROS levels in potato plants [19]. Rioux et al. [20] reported that, in addition to containing minerals, plant hormones and antioxidant compounds, Ascophyllum nodosum extract can exhibit a wide range of growth- and yield-stimulatory effects due to the polysaccharides present in the extract. Such compounds include laminarin [β-glucan– (β-D-glucose polysaccharide)] and fucoidans (fucose-rich sulphated polysaccharides, consisting primarily of 1,2-linked a-L-fucose-4-sulfate units with very small amounts of D-xylose, D-galactose, D-mannose, and uronic acid), both exhibiting radical scavenging antioxidant activities [20]. Rayorath et al. [15] reported significant amounts of betaine (trimethylgycine, a non-protein methyl derivative of glycine) present in ANE, which play a significant role in counteracting metabolic dysfunctions brought on by stress, thus improving plant growth and productivity.
Improved vegetative growth (e.g., plant height, number of leaflets, leaves and leaf area) and certain physiological (leaf chlorophyll index) and yield (tuber yield and mass) attributes following plant extract applications (Table 1) are, therefore, in line with Haider et al. [9], who demonstrated a significant improvement in the growth and yield attributes of potatoes due to various ANE treatments. Similarly, Rajendran et al. [10] demonstrated that growth and yield parameters, such as the plant height, number of leaves and leaf area of sweet pepper plants, were significantly enhanced by foliar ANE and MLE applications. In addition, ANE and MLE applications to tomato plants grown under water-deficit conditions significantly improved plant height, number of leaves and branches as well as leaf area [11]. These findings correspond well with the present study. Various authors have also reported considerable increases in the leaf chlorophyll index following ANE foliar application in several crops, such as broccoli (Brassica oleracea var. italica) [21] and okra (Abelmoschus esculentus L) [22]. These findings agree with the present research.

5. Conclusions

The present study encourages the use of various plant extracts in the crop farming community. The pre-harvest foliar application of various plant extracts considerably enhanced the vegetative growth, physiological and yield attributes of potatoes. Since modern agriculture necessitates financially feasible and easily accessible organic inputs, the use of plant extracts, such as biofertilizers, biostimulants and bio-elicitors, could effectively be used as an ideal multi-active organic input to improve the crop growth and yield potential of agricultural crops. This research has shown that foliar applications of plant extracts, especially of ANE and MLE, have the potential to improve crop productivity and yield. The results presented in this study are, hence, of high significance to commercial as well as small-scale potato growers, as the use of organic plant extracts is an environmentally friendly and a sustainable approach to increasing crop productivity. Plant extracts have shown beneficial effects on solanaceous crops, but further validations of these effects on other crops is recommended.

Author Contributions

Conceptualization, S.M. and I.B.; methodology, S.M.; software, S.M.; validation, S.M., I.B. and B.L.N.; formal analysis, S.M.; investigation, S.M.; resources, B.L.N.; data curation, B.L.N.; writing—original draft preparation, S.M.; writing—review and editing, I.B. and B.L.N.; visualization, B.L.N.; supervision, I.B.; project administration, I.B.; funding acquisition, I.B. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by the National Research Foundation (NRF), grant number PMDS22061523208.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.

Acknowledgments

Technical support from Thokozani Nkosi is gratefully acknowledged. Siphokuhle also thanks NRF for funding. The authors’ family and friends are also well-appreciated for the physical and psychological support they provided to make this research successful.

Conflicts of Interest

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.

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Table 1. Growth, physiological and yield response of potatoes following plant extract applications.
Table 1. Growth, physiological and yield response of potatoes following plant extract applications.
TreatmentsPlant Height (cm)No. of
Leaflets
No. of LeavesLeaf Area (cm2/cm2)Leaf
Chlorophyll
Index (CCI)
Total Yield
(Tubers/Plant)
Fresh Tuber Mass (g)
Control24.26 c42.67 d12.73 c64.91 e28.78 b6.33 b130.5 d
ANE28.56 a51.6 b15.13 a89.89 a34.45 a10.00 a177.90 a
AVE24.37 c47.53 c13.87 b70.54 d33.88 a7.33 b144.6 cd
GBE26.43 b48.87 bc14.20 b76.60 c30.3 b6.33 b155.4 bc
MLE27.60 a55.00 a15.87 a84.01 b34.89 a8.00 b164.1 ab
LSD2.202.880.853.522.8981.8217.04
F pr.<0.001<0.001<0.001<0.001<0.0010.0060.001
Note: Values followed by different lower-case letters in each column are statistically different according to Duncan’s multiple range test (p ≤ 0.05). Control (no application), ANE (Ascophyllum nodosum extract), MLE (moringa leaf extract), GBE (garlic bulb extract) and AVE (aloe vera leaf extract). Values are means (n = 5).
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MDPI and ACS Style

Mbuyisa, S.; Bertling, I.; Ngcobo, B.L. Foliar Application with Plant-Derived Extracts Enhances Growth, Physiological Parameters, and Yield of Potatoes (Solanum tuberosum L.). Biol. Life Sci. Forum 2023, 27, 34. https://doi.org/10.3390/IECAG2023-15385

AMA Style

Mbuyisa S, Bertling I, Ngcobo BL. Foliar Application with Plant-Derived Extracts Enhances Growth, Physiological Parameters, and Yield of Potatoes (Solanum tuberosum L.). Biology and Life Sciences Forum. 2023; 27(1):34. https://doi.org/10.3390/IECAG2023-15385

Chicago/Turabian Style

Mbuyisa, Siphokuhle, Isa Bertling, and Bonga Lewis Ngcobo. 2023. "Foliar Application with Plant-Derived Extracts Enhances Growth, Physiological Parameters, and Yield of Potatoes (Solanum tuberosum L.)" Biology and Life Sciences Forum 27, no. 1: 34. https://doi.org/10.3390/IECAG2023-15385

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