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Apu-apu plant (Pistia stratiotes)
is able to grow rapidly in culture medium given inorganic compounds. P. stratiotes cultured in a culture
medium that has been given NPK fertilizer. P.
stratiotes cultured in a culture medium that has been given NPK fertilizer.
A CRD with 5 concentrations of inorganic fertilizers tested, i.e., 0 (Co); 15
(T1); 20 (T2); 35 (T3); and 50 g/10 L (T4). Observation of growth and decrease
of the inorganic compound in culture medium was done 5 times, every 3 days. The
results show that the best growth was identified in plants grown in T4. At the
end of the experiment, 18.8 g BW with a daily growth rate was 17.9% of the
baseline value of BW. On the 7th day of the experiment, the decrease
was 0.187 mg/L (N) and 0.237 mg/L (P). So P.
stratiotes were able to absorb relatively high N and P from water and use
it for its growth.
Keywords: Pistia stratiotes, Growth, Inorganic
materials absorption
INTRODUCTION
Pistia stratiotes is a species of water plants most commonly found in the public waters in Pekanbaru City, Riau. These aquatic plants usually grow in waters that have been polluted, especially those that contain a lot of organic waste, due to the large amount of waste disposal of the food industry, households, markets and so forth [1]. The waste has resulted in an increase in the content of inorganic compounds in general waters. As a result, the content of inorganic compounds in general waters around the city of Pekanbaru to be high and this, in turn, will affect the balance of the ecosystem of public waters [2].
MATERIALS AND METHODS
This research was conducted in February-March 2018 and tested at Aquatic Biology Laboratory Faculty of Fisheries and Marine University of Riau. Testing of Pistia stratiotes on N and P was done by using a completely random design with 1 factor and 5 levels. Then the pH, DO and temperature conditions during the experiment were observed.
Experimental design
In this experiment was used Completely Randomized Design. Treatment is an inorganic compound with 5 levels (dose 0, 15, 20, 35, 50 g) and repeated 5 times. Observations are made every 3 days for 15 days. The observed responses were changes in root length (cm), leaf (mm), number of leaves (sheets/plants), new shoots (fruit), biomass (wet weight) and Pistia stratiotes ability to absorb nitrate and phosphate compounds in experimental media [11,12]. The experimental container uses a circular plastic jar. While the Pistia stratiotes test sample used was 7 g weight, which was cultured in water as much as 10 L/container and on the bottom of the container was given 200 g of soil substrate from the reservoir in public waters.
Data analysis
Data of measurement result of NO3, PO4, pH, temperature were analyzed descriptively. Daily growth rate calculator (LPH) Pistia stratiotes used the formula:
Α = Wt –Wo / t
Information:
α=Daily growth rate (g/day);
Wt=Final weight of Pistia stratiotes (g)
Wo=Initial weight of Pistia stratiotes (g)
t=Length of maintenance (days)
The ability of Pistia stratiotes in absorbing organic compounds is calculated using the formula:
Rate P = Nutrientearly – Nutrientend
/ Tend - Tearly
While analyzing the change of wet weight (biomass) using SPSS Ver.17 with a significance level a=1%.
RESULTS AND DISCUSSION
Pistia stratiotes water growth
Biomass increase: From the experimental results, it is known that the highest growth of wet weight of Pistia stratiotes occurred at 50 g treatment with the average of 18.8 g wet weight increase. At the 0 g treatment is known to be very slow growth with an average of 7.8 cm. The height of this wet weight growth is due to absorption of N and P elements from the culture medium so that it affects growth and is very good for the growth of Pistia stratiotes. Idris [38], the increase of biomass in aquatic plants can occur due to the presence of luxury consumption which is marked by the decrease of nutrients in the waters. Excessive Luxury consumption is a common response to water plants in accumulating N and P elements higher than normal and used for growth, as a form of food reserves to support its growth activity (Table 1 and Figure 1) [13].
The highest number of shoots was found in the 50 g treatment with a shoot-increase range of 4-11 fruit/plants. The treatment of inorganic compound 0 g is the least shoot growth (0-4 fruits/plant), and this new shoot comes from stolen. A stolen is more formed on test media containing nutrients. Bey et al. [10], more stolen is formed on the test water which contains many nutrients (inorganic material) in high concentration so that the number of tillers produced more and more. The formation of saplings in the Pistia stratiotes plant comes from stolen.
Rijal [15] said that Pistia stratiotes are a plant that can breed not only generatively through pollination on flowers, but also vegetative. Breeding can be done because it is able to form stolen. The stolen can be cut off at the end and will be released and grow into a new individual. These aquatic plants can grow rapidly, as they can be done by generative and vegetative by using stolen so that with these abilities, plants can grow and can expand and form large colonies that can cover the entire surface of the waters available to them [16] (Table 2 and Figure 2).
At the 50 g treatment known to occur the largest growth of root length, with a total average growth of 13.2 cm. While the longest root length growth is on the treatment of 0 g inorganic compounds with a total growth rate of 10.4 cm. This can happen because the elements of nitrate and phosphate in the test medium affect root growth in plants. Sitrabio [19] said that the function of phosphorus (P) element for plants is for root growth, flowering, ripening fruit/seed/grain. The P element also serves for the preparation of cell nuclei, fats, and proteins. In addition, P element also serves to stimulate cell plant defense and enlarge cell tissue.
The treatment of inorganic compounds with a dose of 50 g has the longest root growth. This is caused by Pistia stratiotes water plants using N-nutrient elements in the test medium for root length growth. Walstad [20] explains that many N compounds in the waters will be able to accelerate the growth of roots but also can damage the plant because it can be toxic to the roots [21]. The Pistia stratiotes water plant utilizes the excess of N elements in test media for root growth (Table 3 and Figure 3).
Leaf growth is more likely to grow in high concentrations of inorganic compounds so that the number of leaves produced is also more numerous, but the number of leaves decreases with increasing dose of inorganic compounds on the test media, there has been a change of inorganic compounds into glutamine [23]. In the test medium, the ammonium changes into glutamine that takes place rapidly in the leaves will accelerate the formation of new leaves. The impact will be the number of leaves that many in a relatively short time (Table 4 and Figure 4).
From this experiment, it is known that leaf length growth is faster in giving the dosage of inorganic compound 15 g, but the higher the inorganic compound is given it inhibits the growth of leaf length (20 g, 35 g and 50 g). Fertilizers or inorganic compounds are given can only accelerating the growth of shoots, root length and wet weight in the Pistia stratiotes water plant (Table 5 and Figure 5).
Plants derive the ingredients necessary for growth through the roots by absorbing water from the surrounding environment by isotonic means. Roots also absorb minerals along with water absorption [30]. The transport of water and mineral salts is carried out by absorption by root cell cells, after passing through the root cells, which dissolves into the wood vessels (xylem) and then there will be vertical transport from root to stem to leaf, then taken to all parts of the plant by plant tissues, i.e., phloem [31].
CONCLUSION
The growth of Pistia stratiotes in culture medium given inorganic compounds shows the growth of water plants biologically. The longest leaf growth and the fastest number of leaves occur in the treatment of inorganic compounds 15 g/10 L of water. In the treatment of inorganic compounds, 50 g/10 L can affect the weight gain of wet, root length, and new shoots. The fastest daily growth is in the 50 g treatment, with the growth of 18% per day. The result of SPSS ver.17 analysis showed that the effect was very different from the inorganic compound treatment of 35 g and 50 g/10 L water.
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