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Effects of Biogas Plant Residues and Npk Fertilizers on Growth and Nutritional Quality of Amaranth (amaranthus Tricolor L.)

Farhana Jahan Chowdhury
Department of Soil Science, University of Chittagong

Md. Golam Kibria
Professor
University of Chittagong

Md. Alamgir
Professor
University of Chittagong

Mazharul Islam
Assistant Professor
University of Chittagong

Abstract/ Executive Summary:

A pot experiment was conducted at crop field of the Dept. of Soil Science, University of Chittagong to study the effect of biogas plant residues (BPR) and NPK fertilizers on the growth of and nutrient uptake by Amaranth (Amaranthus tricolor L.). There were six treatments and treatments were consisted as the following: T1=Control (No BPR+No inorganic fertilizers), T2=recommended doses of NPK @ 156 kg N ha-¹, 36 kg P ha-1, 80 kg K ha-¹ from inorganic fertilizer, T3=BPR @ 20 t ha-1+calculated amount of inorganic NPK fertilizer, T4=BPR @ 15 t ha-¹+calculated amount of inorganic NPK fertilizer, T5=BPR @ 10 t ha-¹+calculated amount of inorganic NPK fertilizer, T6=BPR @ 5 t ha-¹+calculated amount of inorganic NPK fertilizer. Each treatment was replicated thrice. The results showed that the minimum no. of leaves, plant height, root length and fresh and dry weight of shoot and root were found in control treatment T1. The no. of leaves and plant height were the maximum in treatment T4 in most cases. However, the highest shoot and root weight was observed in treatment T6. Compared to inorganic fertilizer alone, the application of biogas residues along with NPK fertilizers applied at reduced rates significantly increased dry weight of shoot and root of amaranth by 38–54% and 91–166% respectively. Nutrient uptake was the lowest in control, higher in the treatment of chemical fertilizer alone and the highest in the treatments of biogas plant residues in combination with chemical fertilizers except Ca uptake in shoot. The results of the present study suggest that the application of biogas residues along with reduced rate of inorganic fertilizers is a viable strategy for the sustainable production of amaranth in valley soils of Chittagong.

Keywords: Biogas plant residues, Organic fertilizer, Amaranth, Nutrient uptake

Location: Dept. of Soil Science, University of Chittagong, Chittagong (4331), Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Organic fertilizer, Amaranth

Objectives:

The objectives of the study is to compare the effects of biogas plant residues and NPK fertilizers on growth of amaranth in valley soils of Chittagong. Also to compare the effects of biogas plant residues and NPK fertilizers on nutritional quality of amaranth.

Methodology:

A pot experiment was conducted at crop field of the Dept. of Soil Science, University of Chittagong to study the effect of Biogas Plant Residues (BPR) and NPK fertilizers on the growth of and nutrient uptake by Amaranth (Amaranthus tricolor L.). Recommended doses of N (156 kg ha^-1), P (36 kg ha^-1) and K (80 kg ha-¹) for cultivation of amaranth were applied in each treatment except control. Recommended doses of NPK were supplied either from inorganic fertilizer or from particular amount of biogas plant residues and calculated amount of inorganic fertilizer on the basis of NPK requirement. The treatments were consisted of as the following: T1=Control (No BPR+No inorganic fertilizers); T2=Recommended doses of NPK @ 156 kg N ha^-1, 36 kg P ha^-1, 80 kg K ha^-1 from inorganic fertilizer; T3=Biogas Plant Residues @ 20 t ha^-1+Calculated amount of inorganic NPK fertilizer; T4=Biogas Plant Residues @ 15 t ha-¹+Calculated amount of inorganic NPK fertilizer; T5=Biogas Plant Residues @ 10 t ha^-1+Calculated amount of inorganic NPK fertilizer; T6=Biogas Plant Residues @ 5 t ha-¹+Calculated amount of inorganic NPK fertilizer. The particle size distribution and textural class of the soil were determined by hydrometer method of Day (1965). Soil pH was measured in a 1:2.5 soil water suspension with glass electrode pH meter (Mettler Toledo Seven Compact pH meter). Electrical conductivity (Ec) of the soil was measured by Ec 214 Conductivity Meter. The potassium dichromate wetoxidation method of Walkley and Black (1934) was used for the determination of organic carbon followed by multiplying the values with 1.724 to calculate the organic matter content. Cation exchange capacity of soil was calculated based on pH,sand, clay and organic carbon content (Rashidi and Seilsepour, 2008). Total nitrogen was determined by micro-Kjeldahl method as described by Bremner and Mulvaney (1982). Soil samples were digested with nitric acid and perchloric acid as described by Olsen and Sommers (1982) for the determination of P and K in soil. Phosphorus was determined by ascorbic acid blue-color method by Murphy and Riley (1962). The potassium in the digest was measured by Atomic Absorption Spectrophotometer (Agilent Technologies 240AA). Water holding capacity was measured gravimetric method. The significance of differences between the means of the treatments was evaluated by one way analysis of variance followed by Duncan’s Multiple Range Test at the significance level of 5%. Pearson’s correlation coefficient was estimated to test the relations among metal contents in soil and soil properties and between metal concentrations in plant tissues and metal content in soils. The statistical software Excel and SPSS version 12 (SPSS, 2003) were used in the analysis.

Source of Information: International Journal of Bio-resource and Stress Management 2017, 8(1):096-103.

Article Link (Online Journal): https://www.pphouse.org/ijbsm-article-details.php?article=904

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Application of biogas plant residues and inorganic NPK fertilizers significantly increased growth of and nutrient concentration in amaranth. The combination of biogas plant residues and inorganic fertilizers showed better performance in growth and nutrient concentration in amaranth compared to inorganic fertilizer alone. Overall, application of biogas plant residues @ 5 t ha-¹ along with calculated amount of NPK fertilizer (T6) shows the best results. So, it is recommended integrated application of biogas plant residues and inorganic fertilizer instead of applying inorganic fertilizer alone, which will be economically profitable and environment friendly for the amaranth production in the valley soils of Chittagong.

Knowledge Management: Journal