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Effect of Tea Residues and Used Tea Leaves on the Growth of and Nutrient Uptake by Red Amaranth (amaranthus Tricolor L.)

Banozir Shabnam
Department of Soil, Water and Environment, University of Dhaka, Dhaka 1000, BangladeshBCSIR Labs, Dhaka, Bangladesh.

A. H. Khan
Department of Soil, Water and Environment, University of Dhaka, Dhaka 1000, Bangladesh BCSIR Labs, Dhaka, Bangladesh.

M. Moniruzzaman
Department of Soil, Water and Environment, University of Dhaka, Dhaka 1000, Bangladesh,BCSIR Labs, Dhaka, Bangladesh.

S. Hoque
Department of Soil, Water and Environment, University of Dhaka, Dhaka 1000, Bangladesh, BCSIR Labs, Dhaka, Bangladesh.

Abstract/ Executive Summary:

Pot experiment was conducted to evaluate the effect of tea residues and used tea leaves on the growth of and nutrient uptake by Red Amaranth (Amaranthus tricolor L.). Tea residues from the industry and used tea leaves from kitchen, in combination with urea fertilizer were applied. Six treatments, T₀ (control), T₁ (100% N from urea), T₂(50% N from urea and 50% from used tea leaves), T₃ (50% N from urea and 50% from tea residue), T₄ (25% N from urea and 75% from used tea leaves) and T₅ (25% N from urea and 75% from tea residue), were replicated thrice. Ten plants were allowed to grow in each pot. Plant samples were harvested at 35 days after sowing (DAS). The dry weight of Red amaranth showed significant variation among treatments. The highest shoot dry weight (15.1 g/pot) was obtained from T₂ treatment. Nitrogen, P, K, S, Ca, Fe, Zn, and Mn contents of, and uptake by amaranth shoots showed that combination of tea leaves/residues and urea always gave higher values compared to application of urea alone. Although no definite and fixed trend was observed for all nutrient elements, it can, however, be concluded that tea residue or used tea leaves can be used in addition to inorganic fertilizers as supplement to nitrogen for Red amaranth.

Keywords: Tea residues, Nutrient uptake, Red amaranth

Location: Net house of BCSIR, Dhaka, Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Amaranth

Objectives:

To study the effect of tea residues and used tea leaves on the nutrient uptake by, and growth of Red amaranth (Amaranthus tricolor L.).

Methodology:

A pot experiment was conducted in the net house of BCSIR, Dhaka, with Rathuria soil series to assess the effect of tea residue on nutrient uptake by, and growth of Red Amaranth (Amaranthus tricolor L.). The Rathuria series occurs on the summit of very gently sloping floodplain ridges on the Ganges Floodplain. This series includes pale olive-brown, calcareous loamy soils which occupy marginal part of floodplain ridges. The topsoil consists of about 6 inches of olive grey to dark olive-grey (wet), silty clay loam to silty clay, iron-stained along root channels. Below this occur about 6 inches of olive, mottled grey, friable, loam to silty clay loam with dark grey coating along cracks and root channels. This was graded in pale olive, finely mottled olive-yellow, calcareous silty clay loam to silt loam. Soil sample was collected from Shibalay of Manikganj district. The GPS reading is 89º51'2'' E to 23º49'36'' N. Sample was collected from 0-15 cm depth in composite manner. The experiment was set up in a completely randomized design with six treatments, each replicated thrice. Six kilogram air dried soil sample was taken into each earthen pot. Basal dose of nitrogen for Red amaranth was 11.74 kg/ha. Phosphorus, sulfur and potassium content of the soil were at optimum level so these nutrients were not added. Urea and two types of tea residue were used as source of N. Urea and tea residues were incorporated during the pot preparation. Seeds were spread in broadcast method. Thinning was done at one week after germination and 10 plants were allowed to grow in each pot. Pots were irrigated with tap water to keep field capacity condition. Plant samples were collected at 35 days after sowing (DAS). Plant samples were washed with distilled water and fresh weights were recorded. The samples were oven dried at 80⁰C for 48 hours. Soil samples, collected before and after the experiment, were analyzed for different physical and chemical properties. Plant (Red amaranth), tea residue, collected from an industry, and used tea leaves, collected from kitchen, were also analyzed for chemical properties. Available phosphorus was extracted with 0.5 M NaHCO₃ (pH 8.5) solution. Then P was determined calorimetrically by ascorbic acid blue color method. Available sulfur was extracted with 500 µg/g phosphorus as Ca(H₂PO₄)₂. The S content was determined by turbid metric method and the turbidity was measured by Shimadzu (UV–20-02) Visible Spectrophotometer at 420 nm. Available K was extracted by taking 10g soil with a soil to extract ant ratio of 1:10 and the extract ant was 1 N neutral NH₄OAC. Then the K content was determined. Tea residues and plant samples were wet digested with nitric-perchloric acid as described for determination of total phosphorus, sulfur and potassium. Plant samples were also digested with sulfuric perchloric acid for the determination of nitrogen as described. The experiment was set up in Completely Randomized Design. Data were analyzed for Analysis of Variance (ANOVA) and Duncan’s Multiple Range Test (DMRT) by using MS Excel.

Source of Information: Bangladesh Journal Soil Science, Vol- 37 (1): Pag:13-23, 2015

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

After harvesting of Red amaranth (at 35 DAS) soil samples were collected from each of the pots and analyzed for total nitrogen and available P, K, and S contents. Nitrogen, P, K, and S contents of the soil were found to be influenced by the treatments. For both the plants N, P, K, and S contents of soil decreased from the initial values, irrespective of treatments. It indicates that the rate of nitrogen application was not enough for Red amaranth. From the experiment it can be concluded that tea residue or used tea leaves can be used in addition to inorganic fertilizers as supplement to nitrogen for Red amaranth. However, further study, specially field trial, will be needed to find out the exact profitable rate of tea residue or used tea leaves.

Knowledge Management: Journal