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Production of Biofertilizers From Agro-Wastes

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 International Journal of Engineering and Techniques - Volume 4 Issue 1, Jan – Feb 2018
RESEARCH ARTICLE OPEN ACCESS

Production of Biofertilizers From Agro – Wastes

1
Vidhya Devi, 2Dr. V. Judia Harriet Sumathy
PG & Research Department of Biotechnology,Women’s Christian College,Chennai – 600006

Abstract:
In the past centuries, the farmers were eager in the usage of chemical fertilizers as it yielded
great number of crops. But eventually, they realized that chemical fertilizers affects the soil fertility and
kills the beneficial microbes which enhances the growth of the crops. The major issue they faced using
chemical fertilizers not only affected the soil but human beings as well. To overcome this problem
faced by farmers, Biofertilizers came as the solution. It is an ecofriendly method both to environment
and farmers. The Biofertilizer and biological waste are used to replace the usage of chemical fertilizers
as it does not contain any toxic substance and makes the soil enriched. Use of such natural products like
biofertilizers in crop cultivation will help in safeguarding the soil health and also the quality of crop
products. Solid State Fermentation has been defined as a fermentation process which is used in
cultivation of microorganisms under controlled conditions in the absence or near absence of free
water.It is a potential technology that is used in the production of microbial products such as feed, fuel,
food, chemical and pharmaceutical products. Solid substrate generally provides a good environment to
the microbial flora containing bacteria, fungi and yeast. The present study is aimed at producing
Biofertilizers from Agro - wastes using Solid State Fermentation.

Keywords — Chemical Fertilizers, Bio fertilizers, Microbial Products, Agro – wastes and Solid
State Fermentation.

INTRODUCTION

Biofertilizers are defined as preparations containing living cells or latent cells of efficient
strains of microorganisms that help crop plants’ uptake of nutrients by their interactions in the
rhizosphere when applied through seed or soil (Laditi et. al. 2012). They accelerate certain
microbial processes in the soil which augment the extent of availability of nutrients in a form
easily assimilated by plants (Moola Ram1 et. al. 2014). Very often microorganisms are not
as efficient in natural surroundings as one would expect them to be and therefore artificially
multiplied cultures of efficient selected microorganisms play a vital role in accelerating the
microbial processes in soil. Use of biofertilizers is one of the important components of
integrated nutrient management, as they are cost effective and renewable source of plant
nutrients to supplement the chemical fertilizers for sustainable agriculture (Bákonyi et. al.
2013). Several microorganisms and their association with crop plants are being exploited in
the production of biofertilizers (Rakesh Kumar Meena et. al. 2014). They can be grouped in
different ways based on their nature and function (Table 1).

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S. No. Groups Examples

N2 fixing Biofertilizers
Azotobacter, Beijerinkia, Clostridium,
1. Free-living
Klebsiella, Anabaena, Nostoc,
2. Symbiotic Rhizobium, Frankia, Anabaena azollae
3. Associative Symbiotic Azospirillum
P Solubilizing Biofertilizers
Bacillus megaterium var. phosphaticum,
1. Bacteria Bacillus subtilis
Bacillus circulans, Pseudomonas striata
2. Fungi Penicillium sp, Aspergillus awamori
P Mobilizing Biofertilizers
Glomus sp.,Gigaspora sp.,Acaulospora
1. Arbuscular mycorrhiza sp.,
Scutellospora sp. & Sclerocystis sp.
Laccaria sp., Pisolithus sp., Boletus
2. Ectomycorrhiza
sp., Amanita sp.
3. Ericoid mycorrhizae Pezizella ericae
4. Orchid mycorrhiza Rhizoctonia solani
Biofertilizers for Micro nutrients
Silicate and Zinc
1. Bacillus sp.
solubilizers
Plant Growth Promoting Rhizobacteria
1. Pseudomonas Pseudomonas fluorescens
Table 1 : Types of Biofertilizers

India’s agriculture is composed of many crops especially besides wheat and rice besides
pulses, potatoes, sugarcane, coffee, oil seeds and jute (Shah Alam and Rajendra Kumar
Seth, 2012; Dumitrescu et.al., 2009). Currently, the total agricultural output is lost due to
inefficiencies in harvesting, transport and storage of government subsidized crops. (
(Abdullahi et. al., 2012). Decline of agriculture is due to depletion of soil fertility and also
partially associated with unfavourable distribution of rainfall, drought, storm and floods. The
major problem faced by the farmers are high cost of inorganic fertilizers require for the plant
growth (Anita Khanafari et. al. 2012). The chemical fertilizer pollutes the air, soil and water
polluting agents during the production of crops. In the present study, different fruits are used
as bio fertilizers to check the efficiency in improving plant growth (Soh-Fong Lim and
Sylvester UsanMatu, 2015). The microorganisms present in various fertilizers which benefit
the plant growth have also been studied (Muhammad Yasin et.al., 2012).

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MATERIALS AND METHODOLOGY

COLLECTION OF SAMPLES

Agro – wastes (rotten fruits) were collected from the fruit market near CMBT. The five
different fruits used for the present study are watermelon, papaya, pine apple, custard apple
and guava (Figure 1). Fruits were cut into small pieces and smashed. They were used for
Solid-State Fermentation (SSF). The soil samples were collected from Kanchipuram and
Kolathur (Figures 2 - 3).

Figure 1: Collection of fruits wastes

Figure 2: Kanchipuram Figure 3: Kolathur

PREPARATION FOR FERMENTATION PROCESS

Two batch of fermentation process were carried out - BATCH – I & II.

MATERIALS REQUIRED
1. Polyethene bottle
2. Fruit wastes (rotten)
3. Distilled water
BATCH – I

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Five hundred grams of water melon wastes was placed in a polythene bottle which has a
capacity of 2.5 L. Hundred milliliters of water was added to it. The bottle was kept
undisturbed for 30 -40 days until the soluble product was formed. This soluble product was
filtered with a fabricated filter. The fermented solution is the first batch water melon
biofertilizer.

BATCH – II
Hundred milliliters of this filtered solution was used as inoculum precursor to the next SSF
process. 500 g of new water melon wastes were placed in a polythene bottle. The precursor
increases the rate of fermentation and minimizes the duration of SSF process. The bottle was
kept undisturbed for 20-30 days at room temperature until the soluble product was formed.
This soluble product was filtered with a fabricated filter. This filtered solution is called
second batch water melon biofertilizer. Agro-wastes from pine apple, papaya, and custard
apple were also used to produce first and second batches of biofertilizer.

SOIL FERTILITY ANALYSIS

Soil Fertility Analysis was carried out by estimating the Soil pH, Electric Conductivity,
Calcium, Magnesium, Sulphate, Chloride, Phosphorous, Total Organic Carbon, Nitrogen,
Sodium, Potassium, Iron, Zinc, Manganese and Copper.
ATOMIC ABSORPTION SPECTROPHOTOMETER
Standard solutions were prepared in the range 0, 1,2,5,10 µg/ml of the trace metal. The
standard solutions were diluted with DTPA solution. The working condition of the instrument
is optimized and the readings were taken for standard as well as soil samples.

CALCULATION
µg Te/g soil= µg Te/mlsample * 20ml/5 g soil.
ISOLATION OF MICROORGANISMS FROM SAMPLE
10 gm of the soil sample was added to 90 ml of sterilized water and was mixed with a
magnetic blender for 30 minutes to separate the microorganisms from the soil completely.
After being deposited for 20 minutes, 1ml of suspension was added to the broth and was
incubated at 37°C for 24 hours.
SERIAL DILUTION
The incubated tubes were taken for serial dilution. 9 ml of saline was added to 10 sterilized
test tubes. 1 ml from the incubated test tubes was added to the first test tube that gives 1:10
dilution. The tube was mixed well and 1 ml from the first test tube was transferred to the

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second tube. This was continued till the eighth tube. And 1 ml from the eighth tube was
discarded. Dilutions such as 104, 105, 106 and 107 were chosen for plating.

SPREAD PLATE TECHNIQUE

Once the plates solidified, 0.1 ml from 104 dilution was taken and added to the petri plate, L-
rod was flame sterilized using ethanol and it was used to spread the sample on agar surface.
The same procedure was repeated for 105, 106 and 107 dilutions. 1 plate was used as control
and the plates were incubated at 37°C for 24 hrs. After the incubation period (24 - 48hrs) the
plates were observed for growth on the media.
Selective Media were prepared for Bacillus, Yeast and Rhizobium Species.

BIOCHEMICAL CHARACTERIZATION
Biochemical screening was done by performing tests such as Indole, Methyl Red Test, Citrate
Utilization Test, Triple Sugar Iron Test, Urease Test, Oxidase Test and Catalase Test.

APPLICABILITY OF THE BIOFERTILIZER IN VEGETABLE PLANTATION

The biofertilizers were applied on the various seeds samples of 2 weeks of age in order to
determine the effectiveness of the biofertilizer. Each batch of the biofertilizers were applied
on 100 plant samples. At the same time, another 100 samples were planted in the absence of
any fertilizer.

EXPERIMENTAL DESIGN – POT CULTURE

250 g of soil was taken in empty box which has a capacity of 500gm. 50 g of Cumbu seeds
were taken. 5 ml of watermelon fertilizer and 5 ml of water were mixed and applied to the
soil. The procedure was followed for the rest of the fruits as well. At regular intervals, the
fertilizer was sprinkled on the soil.

RESULTS AND DISCUSSION

SOLID STATE FERMENATION
The fermented solution from Batch II is used to check the efficiency of vegetation plantation
(Figure 4).
BATCH – I BATCH -II

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Figure 4: Batch 1& II Fermentation Process

POT CULTURE (SOIL SAMPLE – (Kanchipuram)

500g of soil sample from Kanchipuram was weighed and taken in a tray. 50 g of seeds
(Cumbu) was taken. 5ml of the biofertilizer (watermelon) and 5ml of water is taken and
mixed well. The fertilizer is applied daily to the soil. The following method is carried out for
other fertilizers. The growth of the plants was observed periodically and the height was noted
(Figure 5).

Figure 5 : Growth of Plant in Soil sample – (Kanchipuram)

POT CULTURE (SOIL SAMPLE – (Kolathur)

500g of soil sample from Kolathur was weighed and taken in a tray. 50 g of seeds (Cumbu)
was taken. 5ml of the biofertilizer (watermelon) and 5ml of water is taken and mixed well.
The fertilizer is applied daily to the soil. The following method is carried out for other

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fertilizers. The growth of the plants was observed periodically and the height was noted
(Figure 6).

CUSTARD APPLE WATER MELON PAPAYA

PINE APPLE CONTROL PLANT GUAVA

Figure 6: Growth of Plants tested in Soil sample - Kolathur.

MEASUREMENT OF PLANT (SOIL SAMPLE -KANCHIPURAM)

Observation of plant growth was noted in Soil sample from Kanchipuram and the
measurement of plant height was taken at 3 week age of the plant. Root elongation, shoot
length and number of leaves germinated were also recorded (Figure 7).

Custard apple

Figure 7: Measurement of Plant Growth in Soil sample – Kanchipuram.

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MEASUREMENT OF PLANTS - (SOIL SAMPLE - KOLATHUR)

Observation of plant growth was noted in Soil sample from Kolathur and the measurement of
plant height was taken at 3 week age of the plant. Root elongation, shoot length and number
of leaves germinated were also recorded (Figure 8).

Figure 8: Measurement of Plant Growth in Soil sample – Kolathur

QUANTITAIVE ANALYSIS OF PLANT GROWTH – SOIL SAMPLE (Kolathur)

Each fruits unique in its nutritional elements which make the plant growth differ in their
morphological characters such as length of root, shoot and height of plant and seed
germination. Custard apple, watermelon and guava shows better growth in plant rate with
reference to the height of plant, length of root, shoot and seeds germinated in soil sample.
The soil sample taken from Kanchipuram showed better seed germination (Table 2).

S.NO AGRO – WASTE TOTAL ROOT SHOOT NO. OF SEEDS

(ROTTEN FRUITS) HEIGHT OF LENGTH LENGTH GERMINATED
PLANT
1 CONTROL PLANT 2 - 4 cm 2cm 3cm 20 - 45%
2 CUSTARD APPLE 5 – 10 cm 2 – 5 cm 3-7 cm 75 - 85 %
3 WATER MELON 10 – 15 cm 5 – 10 cm 3 – 10 cm 85 - 90%
4 GUAVA 15 – 20 cm 10 – 15 cm 5 - 20 cm 80- 85%
5 PINE APPLE 7- 9 cm 1 – 3cm 4-7 cm 60 - 65%
6 PAPAYA 5 – 10 cm 4 – 7 cm 3 – 6 cm 40 - 60%
Table 2: Quantitative Analysis of Plant growth (Soil sample – Kanchipuram)

QUANTITATIVE ANALYSIS OF SOIL SAMPLE - Kolathur

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Each fruits unique in its nutritional elements which make the plant growth differ in their
morphological characters such as length of root, shoot and height of plant and seed
germination. Custard apple, watermelon and guava shows better growth in plant rate with
reference to the height of plant, length of root, shoot and seeds germinated in soil sample.
The soil sample taken from Kanchipuram showed better seed germination (Table 3).

S.NO AGRO – WASTE TOTAL ROOT SHOOT NO. OF SEEDS

(ROTTEN HEIGHT OF LENGTH LENGTH GERMINATED
FRUITS) PLANT
1 CONTROL PLANT 5 cm 2cm 3cm 20 - 45%
2 CUSTARD APPLE 10 – 25 cm 7 – 22 cm 5 – 20 cm 75 - 80 %
3 WATER MELON 20 – 35 cm 5 – 20cm 10 – 15 cm 80 - 85%
4 GUAVA 15 – 30 cm 10 – 25 cm 10 -20 cm 75 - 85%
5 PINE APPLE 7-10 cm 1 – 3cm 4-6 cm 60 - 65%
6 PAPAYA 5 – 10 cm 4 – 7 cm 3 – 6 cm 40 - 60%
Table 3: Quantitative analysis of plant growth -Soil sample

QUANTIFICATION OF TRACE ELEMENTS IN AGRO - WASTES

The trace elements present in the fermented Agro-waste. In water melon, custard apple and
guava the level of Potassium (K) and Phosphorus (P) are rich (Fig.10) shows the various
parameters of agro-wastes. Hence the plants can utilize the amount of K and P present in the
fertilizer as well as in the soil. The potassium helps in the plants in growth, whereas
phosphorous helps in the growth of plants and role in the ripening of fruits (Table 4).

S.NO PARAMETERS UNITS CUSTARD PINE PAPAYA WATER GUAVA

APPLE APPLE MELON
1. pH - 4.5 3.42 4.13 3.010 3.640
2. Phosphorous mg/kg 21.6 128.2 71 169 11.40
3. Potassium mg/kg 382.3 8.6 362 535.3 396.23
4. Sodium mg/kg 4.1 0.89 4 15.3 2.3
5. Calcium mg/kg 107 241 290 113 82.18
6. Magnesium mg/kg 39.2 356 135 543.13 174.23
7. Iron % 0.7 0.74 0.1 0.40 0.26
8. Copper mg/kg 2.6 2.6 2.2 2.47 2.50

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9. Manganese mg/kg 0.1 12.36 0.1 0.10 0.15

10. Zinc mg/kg 0.3 0.53 0.1 0.20 0.23
11. Selenium mg/kg 0.1 0.23 8.1 0.60 0.60
Table 4: Quantification of Trace Elements in Agro – wastes

SOIL FERTILITY ANALYSIS

Soil fertility analysis was carried out at Tamil Nadu Test House (Table 5).

S.NO PARAMETERS UNITS SOIL – 1 SOIL – 2 NORMAL RANGE

1. pH - 7.24 7.1 6–8
2. Electrical µs/cm 1489 735 -
conductivity
3. Phosphorous mg/kg 131 117 0.2%
4. Potassium mg/kg 470 420 1.0%
5. Total organic carbon % 0.50 0.60 -
6. Sodium mg/kg 650 520 100 – 500mg/kg
7. Calcium mg/kg 348 204 0.5 %
8. Magnesium mg/kg 98.11 75.00 0.2 %
9. Sulphate mg/kg 643.30 149.68 0.1 %
10. Chloride mg/kg 154.91 169.60 100 mg / kg
11. Nitrogen % 2.90 2.10 1.5%
12. Iron % 1.20 0.98 2 – 5%
13. Copper mg/kg 65.21 68.16 70 – 100 mg/kg
14. Manganese mg/kg 55.63 58.00 70 – 100 mg/kg
15. Zinc mg/kg 82.13 86.12 70 – 100mg/kg
16. Molybdenum mg/kg 0.001 0.001 0.1%
17. Boron mg/kg 0.001 0.001 0.1%
18. Nickel mg/kg 0.001 0.001 0.1%
Table 5: Comparison of Soil Fertility Analysis

ISOLATION OF SOIL ORGANISM

Soils were collected from Kanchipuram and Kolathur. Soil fertility analysis was done for the
soil. The organisms were isolated from the soil and also from the fermented fruits. The
organism present in the fermented solution helps to enhance the growth of the plants (Figure
9).
Aspergillus spp

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Figure 9: Microorganisms isolated from Soil Samples

ISOLATION OF ORGANISM IN FERMENTED SOLUTION AND BIOCHEMICAL
ANALYSIS

The following microorganisms were isolated from the fermented solution (Figures 10 a- c &
11 and Table - 6).

CUSTARD APPLE GUAVA AND PINE APPLE

AND PAPAYA WATERMELON
Aspergillus spp Bacillus spp Bacillus spp

Figure 10: Isolation of microbes from the fermented solution

Figure 11: Bacillus spp.(Gram positive rods)

Figure 12: Biochemical tests for Bacillus spp.

S.NO. BIOCHEMICAL TEST RESULT

1. Indole test Negative
2. Methyl red test Negative
3. VogesProskauer test Positive
4. Citrate utilization test Positive
5. Triple sugar iron agar test A/K, no gas production
6. Oxidase test Positive

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7. Catalase test Positive

Table 6: Biochemical tests for Bacillus spp.

IDENTIFICATION OF ORGANISM
1) The selective media MYP agar was used to confirm the presence of Bacillus spp.
Three Bacillus spp.was isolated whose colony morphology are as follows
a) Bacillus spp. 1- Red Colour Colony- Lecithinase Activity –Present (Positive
Opaque Zone around the colony)
b) Bacillus spp. 2 - Yellow Colour colony-Lecithinase activity – Absent
c) Bacillus spp. 3 - Red Color colony
2) The selective media YEMA agar was used to confirm the presence of Rhizobium spp.
3) The selective media SDA agar was used to confirm the presence of Aspergillus spp.
a) Aspergillus spp. 1- Yellow-green, powdery and pale yellowish.
b) Aspergillus spp. 2- The initial growth is white and becomes black later on giving “salt
and pepper appearance” which results from darkly pigmented conidia borne in large
numbers on conidiophores.
c) Aspergillus spp. 3- Blue – green, powdery and pale yellow.
d) Aspergillus spp. 4 - Greenish-blue with whitish edge, yellow to brownish colour.

ADVANTAGES OF MICROORGANISM
1) Bacillus spp.
Bacillus spp. is a plant growth promoting bacteria which helps to enhance the availability of
nutrient in the soil. Bacillus spp. produces plant hormones and solubilizes the insoluble form
of phosphates. Bacillus spp. like Bacillus subtilis, Bacillus megaterium and Bacillus
pumillus are the beneficial microorganism to the soil for improving the growth of plants.
Bacillus spp. is called as a Synergistic plant promoter because both the soil and the plant get
benefited. Thus Bacillus spp. helps the plant to absorb the phosphate by solubilizing the
phosphates and produces the auxin which is used to stimulate cell elongation and delays fruit
ripening.

2) Aspergillus spp.
Aspergillus spp. is one of the most important filamentous fungal genera. Aspergillus species
are used in the fermentation industry. Aspergillus spp. is a saprophytic fungus that plays an

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essential role in recycling environmental carbon and nitrogen. It is very effective in removing
the exchangeable, carbonate, and Fe/ Mn oxide fractions of Cu, Cd, Pb and Zn.

CONCLUSION
The study aimed at producing Biofertilizers from Agro – wastes. Agro wastes are defined as

waste which are formed from various agricultural activities. The agro-wastes are usually fruits,

vegetables, weeds and organic manure. The collected Agro-wastes were subjected to Solid State

Fermentation process to produce soluble fermented solution. The Agro – wastes used were

water melon, guava, papaya, custard apple and pine apple. Solid state fermentation aided in

the formation of soluble product and helped to produce the microorganism such as bacteria,

fungi and yeast. The fermented solution was applied to vegetation to check the efficiency of the

Biofertilizer. The soil was collected from two different locations – Kolathur and Kanchipuram

to compare the presence of soil nutrient between two locations. Cumbu (Pennisetum glaucum)

seeds were tested using the biofertilizer. The elongation of root, shoot and germination of seeds

were compared. Watermelon, Custard Apple and Guava fertilizer showed the best efficiency

in comparison to others.

BIBLIOGRAPHY

1. Laditi M. A. , NwokeO. C., Jemo1.M., AbaidooR. C. andOgunjobiA. A. (2012).

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2. Moola Ram1, M. R. Davari and S.N. Sharma (2014) Direct, residual and cumulative
effects of organic manures and biofertilizers on yields, npk uptake, grain quality and
economics of wheat (triticumaestivum l.) under organic farming of rice-wheat cropping
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4. Rakesh Kumar Meena, Sanjay Kumar, SutanuMaji, Devendra Kumar and Manoj
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