The impact of duckweed growth on water quality in sub-tropical ponds

Sengupta, Saurabh; Medda, C.; Dewanji, Anup

doi:10.1007/s10669-010-9293-6

Cited by 11 publications

(5 citation statements)

References 22 publications

(15 reference statements)

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“…Duckweeds are capable of colonizing open water surfaces in several days on account of their extremely rapid growth rate. 17,30 In the present study, duckweed biomass was estimated to be maintained at about 90 g (dry weight) m −2 (about 1250 g (fresh weight) m −2 ) in floodwater (Fig. 3), which was similar to the biomass of 1600 g (fresh weight) m −2 in wastewater reported previously.…”

Section: Weed Controlsupporting

confidence: 89%

“…Formation of the duckweed covering layer was the main factor in suppressing weed growth. Duckweeds are capable of colonizing open water surfaces in several days on account of their extremely rapid growth rate 17, 30 . In the present study, duckweed biomass was estimated to be maintained at about 90 g (dry weight) m −2 (about 1250 g (fresh weight) m −2 ) in floodwater (Fig.…”

Section: Discussionmentioning

confidence: 54%

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A non‐chemical weed control strategy, introducing duckweed into the paddy field

Wang

et al. 2022

Pest Management Science

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BACKGROUND Herbicide resistance in weeds and environmental pollution resulting from excessive application of chemical herbicides keeps increasing. Development of environment‐friendly and effective weed management strategies are required for sustainable agricultural production. In this study we investigated the effects of duckweeds (Landoltia punctata (G. Meyer) Les & D. J. Crawford and Spirodela polyrhiza (Linnaeus) Schle iden) introduction on the weed community and rice growth in paddy fields. RESULTS The study was conducted in the two rice‐growing seasons (2018 and 2019) with three treatments: rice grown without duckweed introduction (CK), with L. punctata introduction (LP), and with S. polyrhiza introduction (SP). On average, LP and SP significantly reduced total weed density by more than 90% and 97%, respectively. Early in the rice‐growing season, both duckweed species completely prevented weed growth. Further, both species significantly promoted rice plant growth in the advanced stages. SP significantly improved grain yield of rice by 23%. Light transmittance, temperature of the floodwater and soil, floodwater pH, and dissolved oxygen content significantly decreased following introduction of the duckweeds, indicating that the duckweeds introduction might inhibit weeds growth by altering environmental factors. CONCLUSION This study provides a possible environment‐friendly way to inhibit weed biomass in the paddy field by introducing duckweeds and interpreted the possible reasons of the impacts of duckweed on environmental variables. Weed control is beneficial for rice growth. Duckweed coverage might be limited in open fields and the associated practice requires additional investigation. © 2022 Society of Chemical Industry.

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Section: Weed Controlsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 54%

A non‐chemical weed control strategy, introducing duckweed into the paddy field

Wang

et al. 2022

Pest Management Science

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“…They are probably the best macrophyte to convert nutria-ent to biomass [3,[8][9][10]. Duckweeds systems have been used to remove pollutants from varying qualities of domestic wastewater [3,6,[11][12][13][14], septage [15], and agricultural wastewater such as swine water [13,16]. It has been reported that these plants help in the uptake of heavy metals from polluted waters as well as improve the overall quality of eutrophic water bodies [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Influence of Salinity on Duckweed Growth and Duckweed Based Wastewater Treatment System

Wendeou¹,

Aïna²,

Crapper³

et al. 2013

JWARP

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The growth of duckweed (Spirodela polyrrhiza) was investigated in an outdoor batch system under 15 different conductivities ranging from 200 μS/cm to 3000 μS/cm with average 110 µmol/m 2 daylight intensity. The growth was performed in an anaerobically treated domestic wastewater using an initial plants population of 50 fronds. Increase in Relative Growth Rate-RGR-(in terms of fresh weight and number of fronds) had a significant non-linear (polynomial) relationship with the conductivity. The maximum RGR related to fresh weight of 0.176 was observed at the conductiviity of 1200 µS/cm while the maximum RGR related to fronds number was 0.193 at the conductivity of 800 µS/cm. The optimum range for duckweeds growth was found to be between conductivities of 600 µS/cm and 1400 µS/cm. The maximal rates of removal of COD of 14.5 mg/day, 2 4 PO  of 0.65 mg/day, NTK of 15.68 mg/day, faecal coliforms of 100% and turbidity of 80.8% were observed in this range. The COD and 2 4 PO  removal rates were highly correlated to the growth rate, with the correlation factor of up to 0.783 and, then to the conductivity. The NTK reduction was positively related to the conductivity.

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“…Fantail goldfish was successfully reared in this study when the pH range was 7.81 ± 0.39 to 7.89 ± 0.46. The impact of duckweed growth on water quality in sub-tropical pond sediment has been reported to be significant at pH values 6.9 and 9.1 [32]. The pH values in ponds with aquatic plants are generally slightly alkaline in the range of 7-8 [18].…”

Section: In Situ Water Qualitymentioning

confidence: 99%

Effects of Aquatic Plants on Nutrient Concentration in Water and Growth Performance of Fantail Goldfish in an Aquaculture System

et al. 2021

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The effects of two aquatic plants, duckweed (Lemna sp.) and azolla (Azolla sp.), on the growth performance of fantail goldfish (Carassius auratus) and dissolved nutrient concentrations were studied. The experiments were carried out in triplicate sets over a period of seven weeks. Eight specimens of fantail goldfish (length = 5.16 ± 0.06 cm; body weight = 2.30 ± 0.06 g) were released into each of the aquariums containing 40 L of water. Submerged sponge filters were used as the substrate (bed) for the nitrifying bacteria to facilitate nitrification. The fish were provided feed at the rate of 2% of their body weight twice daily. In situ and ex situ water parameters (temperature, dissolved oxygen, pH, total suspended solids, ammonia, nitrite, nitrate, and phosphate), body weight and length of the Fantail goldfish, and wet weight of aquatic plants were measured weekly. The results showed no significant differences (p > 0.05) in any of the three aquariums in water temperature, pH, and dissolved oxygen. Survival of the fish was 100%. The highest food conversion ratio and specific growth rate were observed in the aquarium stocked with duckweed, followed by the aquarium with azolla and the control set (p < 0.05). The concentrations of nutrients (ammonia and nitrate) were recorded lowest (p < 0.05) in the aquarium with azolla, followed by duckweed and the control. The results suggested that aquatic plants were effective in absorbing nutrients and can serve as biofilters to create better conditions for the growth of the fantail goldfish.

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The impact of duckweed growth on water quality in sub-tropical ponds

Cited by 11 publications

References 22 publications

A non‐chemical weed control strategy, introducing duckweed into the paddy field

A non‐chemical weed control strategy, introducing duckweed into the paddy field

Influence of Salinity on Duckweed Growth and Duckweed Based Wastewater Treatment System

Effects of Aquatic Plants on Nutrient Concentration in Water and Growth Performance of Fantail Goldfish in an Aquaculture System

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