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Response of Broccoli to Organic Amendments and Accumulation of Heavy Metals in It

Nurunnahar Shorna
Department of Soil, Water and Environment, University of Dhaka, Dhaka- I000, Bangladesh

J. C. Joardar
Soil Science Discipline, Khulna University, Khulna-9208, Bangladesh

Shamima Nasreen
Bangladesh Agricultural Research Institute, Ghazipur, Bangladesh

M. H. Rashid
Department of Soil, Water and Environment, University of Dhaka, Dhaka- I000, Bangladesh

S. M. Imamul Huq
Department of Soil, Water and Environment, University of Dhaka, Dhaka- I000, Bangladesh

Abstract/ Executive Summary:

A field experiment was conducted to see the effect of cow-dung and sewage sludge as organic amendments to broccoli along with chemical fertilizer and heavy metal accumulation due to these organic amendments. The curd yield was significantly increased with the application of both cow-dung (p = 0.039) and sewage sludge (p = 0.047). The highest curd yield for cow-dung and for sewage sludge amendments were 22.18 and 21.73 t/ha, respectively. These yields were obtained from the treatments where 5 t/ha of both cow-dung and sewage sludge were applied along with the recommended dose of chemical fertilizer. Higher amounts of Cd and Pb were found to have accumulatuned in plants at higher rates (20 t/ha) of organic amendments.

Keywords: Broccoli, Cow-dung, Sewage sludge, Growth, Heavy metal

Location: Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur, Bangladesh.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Broccoli

Objectives:

a. To study the effect of different sources of organic matter on the production and yield of broccoli and

b. To study the accumulation of heavy metals in broccoli as contributed from different sources of organic matter application.

Methodology:

A field experiment was conducted at the central farm of Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur. The experimental plots selected were well-drained high land. The soil is Grey Terrace belonging to Chhiata series (AE-28). The geogr phic location is 23°50'N and 82°20'£. The soil samples were collected from the experimental site by composite soil sampling method as suggested by the soil survey staff of the USDA for laboratory analysis. Sewage sludge were collected from Pagla sewage treatment plant, Dhaka and cow-dung were collected from the Milkway dairy farm, Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur. The collected sewage sludge and cow-dung were also air-dried and ground. The ground samples were then screened to pass through a 0.5 mm stainless steel sieve and mixed thoroughly. The samples were preserved in plastic containers and labeled properly which were used for various laboratory analyses. Seedling of broccoli (Brassica oleracea L.) were collected from the Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur and fertilizers (urea, TSP, MP, gypsum, zinc, boric acid and sodium molybdate) were collected from certified fertilizer dealer. Urea, TSP, MP, gypsum, zinc, boric acid and sodium molybdate were used as the source of N, P, K, S, Zn, B and Mo, respectively. The recommended doses of P, K, S, Zn, B and Mo, cow dung and sewage sludge and Y. N were applied at the time of final land preparation and the remaining % N was applied in two equal installments, each at 3^rd and 5^th week after transplanting (bulking and curd formation stage), respectively. Soil, cow-dung, sewage sludge and plants were analyzed for total Pb, Cd, Zn, Fe and Mn by atomic absorption spectrometer. Statistical analyses of all collected data of the experiment were made by using commonly used statistical software Minitab 14.2.

Source of Information: Bangladesh J.Sci. Res. 25(1): 1-10,2012 (June)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The whole plants of broccoli accumulated the highest amount of Mn (50.43 mg/kg d.w.) from the recommended dose of chemical fertilizer plus 20 t/ha sewage sludge treated soil and the least amount (40.43 mg/kg d.w.) from the recommended dose of chemical fertilizer treated soil. The Mn content was higher in leaves compared to curds and sterns and the order was similar to that of Fe. It was also observed that the difference in uptake of Fe, Zn and Mn by the whole plants of broccoli due to application of different rates of sewage sludge (5, 10, and 20 t/ha) was not significant. So, it may be recommended that the application of both cow-dung and sewage sludge at the rate of 5 tlha will increase the curd yield of broccoli. These yields were obtained from the treatments where 5 t/ha of both cow-dung and sewage sludge were applied along with the recommended dose of chemical fertilizer. Higher amounts of Cd and Pb were found to have accumulatuned in plants at higher rates (20 t/ha) of organic amendments.

Knowledge Management: Journal