Abstract
Purpose
Utilization of food waste as composting materials offers a sustainable solution to manage waste and reduce reliance on fertilizers.
Method
This study is focused on the efficiency of food waste compost and the effect of the addition of magnetite (Fe3O4) nanoparticles on the growth and heavy metals uptake by roselle (Hibiscus sabdariffa) for the cultivation period of 127 days. Five different treatments were applied, namely soil (S), food waste compost (F), a mixture of soil and Fe3O4 (SM), a mixture of soil and food waste compost (SF), and a mixture of soil, food waste compost, and Fe3O4 (SFM).
Results
After 127 days of cultivation, the plant height averaged at 803 mm with 26 leaves produced across all treatments. Total leaf area, fruit production, and biomass yield were different (P < 0.05) among the treatments. Roselle crops grown under soil and food waste (SF) media produced the highest yield (12.15 g/plant), the most number of fruits (11 fruits/plant), and the highest leaf area (1200 cm2/plant). The accumulation of heavy metals in plant tissues was lower than the toxicity levels. There was no difference in the heavy metal content in all growing media, except for Ni, Mn, and Pb. Roselle crops applied with Fe3O4 showed no difference (P > 0.05) from its control (without Fe3O4) in relation to growth performance.
Conclusion
The findings of this study showed that food waste can be applied in composting to promote plant growth. Therefore, it can be considered as a substitute for chemical fertilizers. Meanwhile, the application of Fe3O4 appeared to be experimental-condition dependent.
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Introduction
Food waste (FW) surplus, which is estimated to be over one million tons every year, is commonly managed via landfilling. Landfilling is regarded as an environmentally unsustainable solution due to its high energy requirement and large land space utilization (Moh and Manaf 2014; Chew et al. 2018). In Malaysia, FW is classified under municipal solid waste, which accounts for 45% of the total waste produced (Manaf et al. 2009; Aja and Al-Kayiem 2014). Landfilling has been the most preferred technique for handling 80–95% of the municipal solid waste in Malaysia (Aja and Al-Kayiem 2014). According to Jereme et al. (2013), Malaysians end up throwing up to 930 tons of unconsumed food daily, and most of these food wastes are generated by households, wet and night markets, restaurants, hotels, and others.
As opposed to landfilling, composting may offer a sustainable and eco-friendly solution to overcome these issues, apart from enhancing soil productivity, yield, and growth of crops (Petersen et al. 2003), and reducing reliance on fertilizers (Lin et al. 2013). Many countries have considered turning FW into compost as a way to overcome disposing FW in landfills or incineration (Cerda et al. 2018). Composting can be regarded as an effective way to handle FW by turning them into value-added products for agricultural application. By converting FW into compost, the organic contents in FW, such as carbohydrates, starch, cellulose, proteins, lipids, as well as nutrients (e.g., nitrogen and phosphorus) can be utilized as organic fertilizers or as soil amendments.
Various factors may, however, contribute to the quality of FW compost as the sources of FW vary by their heterogeneous compositions, sources, and the eating habits of consumers (Cerda et al. 2018). Several studies have concluded that when FW compost is applied as soil additive, it promotes plant growth and improves biomass and nutrition provision (Choy et al. 2015; Ronga et al. 2016; Kaur et al. 2017). Nevertheless, the quality of the food compost produced depends on various factors, such as moisture content, carbon and nitrogen ratio, aeration, porosity, bulk density, and organic matter (Azim et al. 2018; Waqas et al. 2018). In addition, the effectiveness of compost as soil additive depends on its ability to reduce metal bioavailability or uptake by plants or crops by retaining them in bound form (Adejumo et al. 2018). Therefore, investigation of heavy metals in plants grown using compost-amended soil is vital to ascertain no sign of metal toxicity.
Nanoparticles are emerging to overcome agricultural issues, such as low soil fertility, pest attack, stagnancy of crop production, poor irrigation, climate uncertainty, and polluted soil (Baker et al. 2017). Nanoparticles can enhance crop growth and simultaneously act as fungicides, insecticides, herbicides, and pesticides (Parisi et al. 2015). For example, ZnO nanoparticles were used for seed germination and root of Chick pea (Cicer arietinum) (Pandey et al. 2010) while magnetite (Fe3O4) was used for pumpkin (Cucurbita maxima) growth (Zhu et al. 2008). Among various nanoparticles, Fe3O4 is useful in agricultural application due to its ability to undergo absorption, translocation, and accumulation for plant growth promotion (Wang et al. 2011). Nevertheless, the performance of Fe3O4 is dependent on its properties, types of plants, and the specific conditions of the experiment itself (Lin and Xing 2007). Previous studies showed that the effects of Fe3O4 on the growth of plants vary from inhibition to promotion, as well as having no effect (Zhu et al. 2008; Wang et al. 2011; Konatea et al. 2018). Studies on the application of Fe3O4 nanoparticles are still lacking, particularly on its ability to enhance crop growth when incorporated into soil medium.
This study chose tea leaves, coffee grounds, lemongrass leaves, eggshells, and banana peels as they are readily available, produced in large quantities, and contain nutrients, such as nitrogen, phosphorus, and potassium. Their essential elements content, natural liming properties, and fungicides behavior have been contemplated to be beneficial in the plant growth mechanism (Morikawa and Saigusa 2011; Kalemelawa et al. 2012; Abd El-Azeem et al. 2013; Al-Yousef 2013). Although extensive studies have been conducted on FW composting, very limited information is available on the combined effects of FW and Fe3O4 on plant growth.
The objective of this study was to evaluate the performance of FW compost and Fe3O4 on the growth of roselle (Hibiscus sabdariffa) within 127 days of cultivation. Various combinations of treatments were investigated, namely soil (S), FW compost (F), mixture of soil and Fe3O4 (SM), mixture of soil and FW compost (SF), and mixture of soil, FW compost, and Fe3O4 (SFM) to determine their effects on the growth of roselle, measured in terms of height, number of leaves, number of fruits, dry weight of fruits, and total leaf area.
Materials and methods
Preparation of food waste materials
The FW compost used in this study consisted of tea leaves, coffee grounds, banana peels, eggshells, and lemongrass leaves. These wastes were collected from cafeterias in Universiti Malaysia Sarawak and food stalls in Desa Ilmu, Kota Samarahan, Sarawak. All samples were air dried at ambient temperature of ~ 30 °C. Coffee grounds, banana peels, and eggshells were then oven-dried to overcome problems associated with fungi and pests (Table 1). Each waste sample was ground to pass through a 2.0-mm sieve (Quest Scientific FGR-350). The waste samples of tea leaves, coffee grounds, banana peels, eggshells, and lemongrass leaves were then mixed (on a volume basis) at 41%, 13%, 20%, 13%, and 13%, respectively, to form a composting media (Guidoni et al. 2018).
Experimental design and husbandry
A completely randomized design experiment was initiated using five growing media, namely soil (S), food waste compost (FW), soil + magnetite (SM), soil + food waste compost (SF), and soil + food waste compost + magnetite (SFM) in four replicates. The soil (S) media was a potting mixture of red burnt soil, humus compound, burned husks, coco peat, charcoal, and river sand, which was manufactured by Kean Being Lee Industries (M) Sdn. Bhd. The magnetite powder (Fe3O4) nanoparticles were synthesized according to the procedures published by Kanakaraju et al. (2018). Plastic pots (6.0 L) were filled with these growing media according to the ratio by volume of each component (Table 2).
Fifty seeds of the roselle plant were sown in a plastic tray (0.3 × 0.25 × 0.1 m) filled with a mixture of coco peat and top soil (1:1 by volume). The ratio of 1:1 was chosen based on minor modifications to the procedures proposed by Sutari et al. (2018). The tray was placed in a shaded pavement area outside the laboratory at the Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, Kota Samarahan, Malaysia. After 15 days, roselle seedlings that produced four leaves were selected and transplanted into 6.0 L pots containing each growing medium (S, F, SM, SF, and SFM). In each pot, only one plant was transplanted and used for detailed measurement. After 4 weeks from the sowing day, the pots were placed in an open area outside the laboratory, where the plants received full sunlight (5 h of sunshine per day). In this location, the average daily humidity was 87%. The mean daily minimum and maximum air temperatures were at 24 °C and 32 °C, respectively. The mean monthly rainfall was 462 mm throughout the growing period (127 days). Except for rainy days, the pots were watered daily at ~ 500 mL/pot.
Measurement of plant growth and analysis of heavy metal uptake
Plant height and the number of leaves were measured and counted at 7-day intervals for a period of 112 days. The crop entered into the flowering phase after 92 days after sowing. Following this event, the number of fruits produced was counted at weekly interval until the time of harvest. The roselle plants were harvested after 127 days after sowing. Following harvest, the above ground biomass was separated into fruits, leaves, and stems. Total leaf area was measured using a leaf area meter (AT Delta-T Devices, UK). A piece of 25 cm2 paper was used to calibrate the instrument prior to measurement. The dry weight of the fruits, leaves, and stems were measured using an electronic scale after these yield components were oven-dried (70 °C) for 2 days. Each component was then ground into solid powder for analysis of heavy metals.
The plants, top soil, and FW compost samples were acid digested using procedures described by Uddin et al. (2016). Specifically, the samples were digested using a mixture of concentrated HNO3 and HCl (ratio of 1:3). Approximately 1 g of dry weight plant sample was added into a 50-mL Pyrex beaker and heated on a hotplate at 95 °C. Then, the acids were added to the sample and heated for 5 h. The resultant solution was filtered using a filter paper and diluted to 100 mL of solution. The concentrations of Pb, Cd, Ni, Al, Cu, Mn, Zn, and Fe were determined using Flame Atomic Absorption Spectroscopy (FAAS) (iCE 3000 Thermo Scientific).
Nutrient analysis
The growing media (before and after roselle cultivation) and plant tissues were analyzed for nitrogen (N), phosphorus (P), and potassium (K) contents. Total nitrogen was analyzed using the Kjedahl method, which comprised digestion, distillation, and titration. Available phosphorus was determined using the Bray and Krutz II method. As for potassium content, the samples were digested according to the EPA Method 3050B. The FAAS was used to analyze the potassium concentration in the samples.
Iron leaching test
This experiment was conducted only with the soil + magnetite (SM) and soil + food waste compost + magnetite (SFM) growing media. Magnetite was applied a week after transplanting (22 days after sowing) to allow the crops to acclimatize, as well as to avoid transplanting shock. The purpose of magnetite addition was to determine its effect on the growth of roselle. Given that iron (Fe) is one of the mineral components of magnetite, the aim of this experiment was to assess the leaching potential of Fe to the environment following its application to the growing media.
The bottom of the pot was covered with cotton cloth to prevent medium (soil or food waste compost) erosion into the leachate, as shown in Fig. 1. Then, the pot was placed on the small pail to collect the leachate. The leachate was formed from the drainage of irrigation. The leachate was collected once a week and iron leaching trend was monitored for 17 weeks (127 days) of plant growth. The leachate was digested according to EPA Method (3010A). Then, the level of Fe content in the leachate was determined using FAAS.
Statistical analysis
All variates were analyzed using the one-way analysis of variance (ANOVA). Treatment means were compared using the Turkey test whenever the ANOVA indicated that the differences among treatments presented as P < 0.05. Standard errors of the mean were reported for each measured variable.
Results and discussion
Plant height
Crops grown in all media started to show a sharp increment in plant height after 85 days after sowing (Fig. 2). In most treatments, the growth pattern appeared to be sigmoidal. The growing media did not affect the height of the roselle plants (P > 0.05). These plants reached the average height of 803 (± 46.2) mm after 127 days after sowing in all treatments.
Food waste (F) medium was highly aerated and provided more porous segments (Ruggieri et al. 2009), which might not have been suitable for long-term plant growth, despite being an essential characteristic for seed germination. Optimum macroporosity could influence the water retention potential to the medium compactness, resulting in an improved plant growth performance (Drewry et al. 2008). Thus, soil (S) may provide a better porosity compared with food compost alone. Potting mixed soil contained air porosity of 25–30% and water holding capacity of ~ 36% (Beardsell et al. 1979). Crops cultivated in soil and food waste compost (SF) showed an exponential growth after 99 days and began to outperform the plants grown in F, SM, and SFM media.
Leaf production
The total number of leaves did not differ among the treatments (P > 0.05). Across all treatments, the crop produced 27 ± 1.4 leaves after 127 days after sowing (Fig. 3). The production of leaves was indicative of the plant development and it is independent of plant growth. The appearance of leaves started to increase exponentially after 99 days for crops cultivated in SF media and 106 days for those grown in food waste compost (F). It is believed that during this time, the plants have produced secondary leaves and have begun to expand their canopy, where they will vigorously compete for light and nutrient. Therefore, the rate of leaf production would determine its success in establishment. In these treatments (SF and F media), plants that formed secondary leaves earlier than plants in other media have the advantage of capturing more incoming radiation through the expansion of the canopy.
Total leaf area
The total leaf area was measured following harvest at 127 days after sowing (Fig. 4). Treatments showed significant differences between SF and SM crops at P < 0.05 (Fig. 4). As expected, SF crops with total leaves of 34 ± 2.5 cm2 (Fig. 3) gave the largest leaf area of 1212 ± 160.0 cm2 (Fig. 4). In contrast, SM crops have a canopy size of 460 ± 34.4 cm2 because they only produced 23 ± 1.3 cm2 leaves at the time of harvest. Thus, the addition of FW compost into the soil at 1:1 volume ratio has elevated the growth performance of roselle crop. The FW compost supplied additional macronutrients to the crop, which promoted both vegetative and reproductive growth. In addition, the results from the analyses of nitrogen, phosphorus, and potassium contents showed that these macronutrients were present in large amounts in FW compost (F) (refer to Fig. 6).
Number of fruits
The final numbers of fruits produced were varied among the growing media (P < 0.01) (Fig. 5). The first fruit was initiated after 92 days for crops cultivated in soil (S), and soil and food waste compost (SF). At 106 days after sowing, crops sown in SF media began to produce fruits exponentially and outnumbered the production of crops in other treatments. As a result, crops in SF media produced the highest number of fruits (11 ± 1.1 fruits) at 127 days of growth. The ability of SF crops to produce more fruits could be related to its early canopy establishment (Fig. 3). SF crops produced secondary leaves earlier (after 99 days) compared with crops from other treatments. The production of secondary leaves led to the formation of branches within the plants. Consequently, more growing points were available for fruit initiation. Roselle crops grown in SM media showed the slowest progress in fruit production. Its productivity started only after 99 days after sowing, and the rate of fruit production was only one fruit per week. Thus, following the observation period of 4 weeks, this treatment has only yielded up to 4 ± 0.8 fruits at day 127 and recorded the lowest number of fruits among all treatments.
Yield
The dry matter yield of fruits and vegetative components of these roselle plants were different (P < 0.05) among all treatments (Table 3). For fruit production, crops cultivated under S, F, and SFM media produced an average biomass of 1.78 g/plant. The mixture of both soil and FW compost was able to supply additional nutrients and improve the porosity of the soil. These conditions, in turn, increased the water infiltration into the soil, root penetration, crop nutrient uptake, and water uptake. In contrast, the growing media based on food waste compost alone (F) and soil + magnetite (SM) were inadequate to support the growth of roselle crops (Figs. 2, 3, 4 and 5), and consequently, giving the lowest fruit yield (~ 0.46 g/plant). Total dry matter production for crops cultivated in S and SF media gave the highest aboveground biomass of ~ 11.37 g/plant, which was contributed by the heaviest weight of fruits, leaves, and stems (Table 3).
Effect of Fe3O4 on plant growth
The growth performance in response to magnetite application was compared between roselle crops cultivated in soil + magnetite (SM), and its control, soil (S) growing media. The results showed that crops grown merely in soil performed better without the application of Fe3O4. For example, the canopy size of S crops was bigger (795 ± 36.8 cm2) than the canopy size of SM crops (460 ± 34.4 cm2) (Fig. 4). Crops in S medium produced slightly more fruits (5 ± 0.3 fruits) than those in SM media (4 ± 0.4 fruits) (Fig. 5). The total aboveground biomass in S crops was also two times heavier (10.59 ± 0.647 g) than the SM crops (5.17 ± 0.475 g) (Table 3).
Similarly, the comparison between SFM and its control SF showed that the addition of Fe3O4 into the growing medium has reduced the yielding ability of roselle crops. For example, SFM crops yielded only 7 ± 1.7 fruits compared with SF crops (11 ± 1.1 fruits) after 127 days (Fig. 5). In addition, the total aboveground biomass produced by SFM crops was much lower, at 7.03 ± 2.541 g/plant compared with the total aboveground biomass produced by SF crops (12.15 ± 2.343 g/plant) (Table 3). Crops grown in SFM media also produced a smaller canopy size of 716 ± 226.8 cm2 compared to 1212 ± 153.0 cm2 from SF treatment (Fig. 4).
Roselle plants could be deduced to demonstrate low tolerance to direct application of Fe3O4. This could be due to the Fe3O4 powder having no attachment to the soil, and also likely due to the non-optimized amount of Fe3O4. This observation corroborates the results in a study reported by Zhu et al. (2008), whereby the addition of Fe3O4 in soil did not favor the growth of pumpkin.
Nutrients and plant tissue analysis
In all growing media, the levels of nitrogen, phosphorus, and potassium content were higher prior to crop cultivation (initial) compared with post-harvest (Fig. 6a–c). The initial nitrogen content in SF media was 342.8 mg/kg, which reduced to 290.2 mg/kg after 127 days (post-harvest) (Fig. 6a). The declining nutrient level as a function of time is expected as the loss of nutrients was accounted for from the uptake by plants and leaching. In addition, the cultivation of roselle during the wet season (total precipitation of 1848 mm throughout the growing period) is believed to be the main cause of nutrient leaching. However, the amounts of nitrogen, phosphorus, and potassium losses from the growing media via leaching and plant uptake were not assessed in this present study, and should be considered in future work.
The initial contents of all macronutrients were in abundance in the food waste compost (F) media, with 938.75 mg/kg of nitrogen, 2.09 mg/kg of phosphorus, and 78.68 mg/kg of potassium. The inclusion of banana peels, which constituted the second largest component in the food waste compost, could have contributed to the high level of potassium. Banana peels provide potassium nutrition, which is beneficial for fruit development (Kalemelawa et al. 2012). Nevertheless, the nutrient compositions for the individual components that make up the food waste, namely tea leaves, coffee grounds, banana peels, eggshells, and lemongrass leaves were not quantified. This was an oversight in this study and therefore, should be included in future study. In plant tissues, the concentrations of phosphorus and potassium were found to be the highest in the soil (S) treatment (Fig. 6b–c). The mobility of the phosphate ions in soil could have increased the phosphorus uptake by the plants through rhizosphere acidification and root proliferation, which provide enzyme-catalyzed hydrolysis to secrete the organic phosphorus (Jing et al. 2010; Shen et al. 2011).
Accumulation of heavy metals in plant tissue
The chemical properties of the top soil and FW compost are presented in Table 4. FW compost recorded a slightly higher pH than the top soil. The basic condition of FW compost could be attributed to the eggshells and banana peels, which could serve as a liming material (King’ori 2011) and an alkalinity agent with great acidic controlling properties (Barreira et al. 2008), respectively. The top soil recorded a higher concentration of metals compared to FW compost. Iron (Fe) and aluminum (Al) were found to be present in elevated concentrations in the top soil. In the case of FW compost, Al and Fe were detected to be high, but their concentrations were relatively lower than those in the top soil.
The concentrations of lead (Pb), cadmium (Cd), and copper (Cu) found in roselle crops were negligible (0–0.05 mg/kg) (Fig. 7). With the exception of SFM treatment, Pb was not detected in roselle plant tissues. In contrast, a previous study reported that Pb was detected in roselle plant tissues from the application of organic manure into soil (Wuana and Mbasugh 2014). The initial sample of growing media did not indicate the presence of Cd, but after 127 days of cultivation, the presence of Cd could be associated with organic matter and carbonate. This association provided a mobility pathway for Cd to be taken up by the plant, together with iron (Fe) mineral dissolution (Muehe et al. 2013). Hence, Cd is known as a mineral-associated contaminant.
Crops grown merely on soil (S) and food waste compost (F) have extracted the least amount of nickel (Ni) (0.11 and 0.15 mg/kg, respectively) compared to crops grown in the rest of the growing media (~ 0.22 mg/kg). The highest level of manganese (Mn) (1.44 mg/kg) was found in crops cultivated in food waste compost (F), followed by SFM crops (0.74 mg/kg). The concentrations of zinc (Zn) and Fe were 0.59 and 1.62 mg/kg, respectively, across all growing media. Fe content in plant tissues was higher compared with the contents of Cu, Zn, and Pb, which are similar to the results reported by Chiroma et al. (2012). This could be due to the high possibility of Fe strategizing its translocation from the growing medium to the plant tissue, mainly on the interaction of ferric chelate reductase, which ended up mostly in the leaf chloroplast (Jeong and Connolly 2009).
Among all heavy metals detected, aluminum (Al) was present in the highest amount of 2.39 mg/kg across all growing media. However, the presence of Al in plant tissues can be considered as low. This is because Al is mainly accumulated in the roots (underground) compared to aboveground, such as in stems, leaves, and fruits due to its low ability to be transported into higher parts of the plant (Ondo et al. 2017).
The heavy metal concentrations in plant tissues for all elements did not violate the permissible limits of World Health Organization (WHO) guidelines for vegetable crops (Bigdeli and Seilsepour 2008). Thus, roselle plant could be deduced to possess low tolerance to heavy metals. The pH values of soil (7.1) and FW compost (8.5) that were between neutral and basic would have prevented these heavy metals from being optimally absorbed (Table 4). According to Zheng et al. (2005), elements such as Cu, Fe, Mn, and Pb have great solubility and provide the bioavailability for plant uptake in the region of slightly acidic medium compared to a basic condition. Thus, the low amounts of heavy metals in roselle plant tissues shows that the fruits are safe to be consumed.
Iron leaching test
Fluctuation of Fe leaching in some weeks could be due to environmental factors, such as rainfall because the pots were placed in an open area. Rain water has been exposed to the pots, which could have contributed to the fluctuating trend of Fe content every week. SFM can be seen to be more dramatically affected by the Fe3O4 introduction to the medium (Fig. 8). The leachate might contain some amount of medium erosion from the SFM pots due to the texture of FW compost, which was light, aerated, and could easily pass through the cotton cloth into the leachate. This might have caused the higher Fe content in SFM leachate, which was not entirely from the addition of Fe3O4. SM treatment showed a marginal change in Fe leaching throughout a period of 127 days. Leachate from the SFM was at 18.8 ± 8.11 mg/L on day 29 of the highest Fe concentration. Meanwhile, day 57 recorded the lowest concentration of 0.5 ± 0.43 mg/L (Fig. 8). SM treatment showed the maximum Fe concentration of 1.6 ± 1.25 mg/L on day 50, while the lowest concentration of 0.2 ± 0.13 mg/L was collected on day 78. According to the Ministry of Health in Malaysia (MOH), Fe concentration limit is 1.0 mg/L for raw water bodies, which is then considered as suitable to be treated as water supply. The Department of Environment (DOE) in Malaysia has outlined the maximum amount of 5.0 mg/L of leachate discharge as inorganic Fe (Department of Environment 2010). Based on the leaching test, the high concentration of Fe was deemed unsuitable to be introduced to agricultural areas near water bodies, or water reservoirs to avoid Fe toxicity in water. The high concentration of Fe could also be attributed to the initial Fe levels present in soil and FW compost.
Conclusion
The application of FW compost to soil in the ratio of 1:1 has resulted in the best roselle plant growth and development. However, it showed no significant difference (P > 0.05) for most of the parameters studied. Biologically, there was an increasing trend for leaves, fruits, dry weight, and total leaf surface area due to FW inclusion compared to top soil (S) treatment. Thus, FW compost can be regarded as a useful substitute for commercial fertilizers since it has a significant effect on plant growth. The heavy metal uptake was insignificant for most of the metals studied, except for Ni, Mn, and Pb as the roselle plants showed low tolerance to heavy metal mobility to its tissues in different types of treatments. The performance of Fe3O4 was observed to be similar for all parameters studied compared to its control. Future studies can be performed by incorporating ferrofluid to the soil to increase its binding to the treatment medium. This approach could potentially impose synergistic effects on plant growth compared to the direct application of Fe3O4 as a solid powder to the treatment medium. In addition, the monitoring of the growth performance will also be continued after 127 days for soil combined with Fe3O4 due to the promising results. Future work needs to examine the links between the chemical and physical properties of each composting media and plant growth more closely.
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Acknowledgements
The authors would like to thank Dr Mohd Effendi Wasli and Mr Douglas Bungan for their assistance in nitrogen analysis, as well as Dr Freddy Yeo for provision of plastic pots.
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bin Shuhaimi, S.AD.N., Kanakaraju, D. & Nori, H. Growth performance of roselle (Hibiscus sabdariffa) under application of food waste compost and Fe3O4 nanoparticle treatment. Int J Recycl Org Waste Agricult 8 (Suppl 1), 299–309 (2019). https://doi.org/10.1007/s40093-019-00302-x
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DOI: https://doi.org/10.1007/s40093-019-00302-x