Search

Soil pollution can occur due to agricultural waste, one of which is the excessive use of pesticides. Contaminants that are often found are heavy metal of copper (Cu). Rice plants will absorb and store heavy metal elements in polluted soil and waters, and these heavy metals will undergo a process of bioaccumulation in plants that affect plant growth. Efforts to deal with heavy metal contaminants have been carried out. In its application, plants such as hydrilla plant (Hydrilla verticillata) can be used to reduce pollution in the environment. This study aims to determine the effectiveness of using hydrilla plants in reducing heavy metal pollutant copper in flooded rice cultivation. This research was conducted from May-November 2022 at the Agrotechnology Greenhouse, and for laboratory testing it was carried out at the CDAST Laboratory, University of Jember. This research was conducted using a completely randomized design consisting of one factor with four replications. Giving hydrilla did not significantly affect the morphology of rice plants but had a significant effect on the increasing levels of chlorophyll. The concentration of copper in rice plants decreased after treatment with hydrilla plants compared to negative controls without hydrilla plants. In this study, it can be concluded that the use of hydrilla was able to reduce the levels of copper metal present in rice plants and did not affect the growth of rice plants morphologically. [ABSTRACT FROM AUTHOR]

ABSTRAK Serasah mempunyai peran penting dalam transfer logam dari tanaman ke dalam media lingkungan hidupnya. Tujuan penelitian mengkaji tingkat eliminasi logam Cu melalui proses defoliasi serasah daun Avicennia marina di tambak bandeng. Bahan penelitian terdiri dari air dan sedimen tambak serta serasah daun mangrove dari jenis A. marina. Destruksi logam Cu pada air, sedimen dan serasah menggunakan Tefflon bomb extraction, dilanjutkan dengan pengukuran logam Cu menggunakan AAS. Penelitian dilakukan selama 90 hari pada tambak bandeng wilayah Tapak Semarang, di dalamnya terdapat tumbuhan mangrove A. marina. Kadar logam Cu pada air tambak penelitian antara 0,02±0,007 - 0,05±0,008 mg/L. Konsentrasi logam Cu pada sedimen tambak penelitian berkisar antara 15,20±1,77 - 25,03 ±4,77 mg/kg, Faktor Konsentrasi (FK) air dan sedimen tambak penelitian antara 500.52 - 897,70. Serasah daun A. marina mengandung logam Cu 2,346±0,536 – 5,285±2,091 mg/kg. Hasil penelitian menunjukkan terdapat kemampuan serasah A. marina dalam mengembalikan logam Cu ke lingkungan hidupnya. Perbandingan antara serasah dengan air dan sedimen menunjukkan bahwa kemampuan serasah dalam mengembalikan Cu ke perairan (46,92 - 228,72) lebih besar dari pada ke sedimen lingkungan hidupnya (0,094 - 0,318). ABSTRACT Avicennia marina litter plays an important role in the heavy metal transfer from the plant into its environment. It occurs due to its ability in eliminating the metal from its tissue, as its adaptation to metal – polluted environment. The purpose of this research was to examine the elimination level of Cu through a defoliation process of A. marina into milkfish pond. The objects of the research were water, sediment and A. marina litter. The destruction of Cu in water, sediment and litter was accomplished using Tefflon bomb extraction, followed by measurement of Cu using AAS. The study was conducted in milkfish pond in Tapak region at Semarang city for 90 days, in which the A. marina plants grow. The value of copper content in the water pond was between 0.02 ± 0.007 to 0.05 ± 0.008 mg / L. The concentration of Cu in the sediment ranged from 15.20 ± 1.77 to 25.03 ± 4.77 mg / kg, the concentration factor (CF) of water and waste sediment with water and sediment ranged from 500.52 - 897, 70. The content of Cu in A. marina litter was 2.346 ± 0.536 to 5.285 ± 2.091 mg / kg. The result of the research showed the ability of A. marina litter to reconstruct copper to its environment. The comparison between the ability of A. marina litter to reinstate Cu to water (46.92 to 228.72) is greater than that of the sediment to its environment (.094-.318).