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Root Growth of Four Transplant Aman Rice Varieties as Influenced by Npks Fertilizer

N.C. Pal
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

M.A.R. Sarkar
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

M.Z. Hossain
DAE, Khamarbai, Farmgate, Dhaka, Bangladesh

S.C. Barman
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

An experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, during July to December 2006 to study the root growth of four Transplant Aman rice varieties as influenced by NPKS fertilization. The experiment was laid out in a split-plot design with three replications. The experiment consisted of four varieties viz. BRRI dhan30, BRRI dhan31, BRRI dhan40 and BRRI dhan41; and four levels of fertilizers viz. 0, 50%, 100% and 150% of the recommended dose of NPKS. BRRI dhan41 had better performance in all root parameters. All root parameters except number of roots hill^-1 performed better at high level of fertilizer. The interaction effect between variety and fertilizer level was significant in respect of number of roots hill^-1, fresh weight of root (except at 30 days after transplanting (DAT) and 90 DAT), dry weight of root, fresh weight of above ground plant part (except at 30 DAT and 90 DAT) and dry weight of above ground plant part (except at 90 DAT).

Keywords: Root growth, Rice varieties, NPKS fertilizer

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-07-2006

End Date: 00-12-2006

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

1. To obtain accurate information on the root system morphology quantitatively and qualitatively.

Methodology:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, during the period from July to December 2006. The experimental area was characterized by Non-calcareous Dark Grey Floodplain soil belonging to the Sonatola soil series under the Old Brahmaputra Floodplain. Soil of the experimental field was more or less neutral in reaction, low in organic matter content and its general fertility level was low. The experimental treatment comprises four Transplant Aman rice varieties viz. BRRI dhan30, BRRI dhan31, BRRI dhan40 and BRRI dhan41; and four levels of fertilizer- 0, 50%, 100% and 150% of the recommended dose of NPKS. The experiment was laid out in a split plot design with three replications. The unit plot size was 4.0 m × 2.5 m. The nutrients P, K, S and Zn were applied during final land preparation in the form of triple super phosphate, muriate of potash, gypsum and zinc sulphate, respectively. The recommended dose of fertilizers were 50, 60, 35 and 5 kg ha^-1 of urea, triple super phosphate, muriate of potash, gypsum and zinc sulphate, respectively. The recommended dose of urea fertilizer was 220 kg ha-1. Urea was top dressed in three equal splits at 15, 30 and 45 days after transplanting. Healthy dry seeds of all the varieties were directly sown on 5 July 2006 in the previously prepared nursery bed. Thirty-day old seedlings were transplanted on 5 August 2006 @ three seedlings hill-1 maintaining a spacing of 25 cm × 15 cm. Intercultural operations were done as and when necessary. For measurement of number of roots hill^-1, root length, dry weight of root and dry weight of above ground plant part, destructive sampling of five randomly selected hills was used. Soil core samplers were used to collect the root samples. Data were analyzed statistically and the mean differences were adjudged by Duncan’s Multiple Range Test.

Source of Information: J. Bangladesh Agril. Univ. 6(2): 235–238, 2008; ISSN 1810-3030

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

All root parameters except number of roots hill^-1 performed better at high level of fertilizer. The interaction effect between variety and fertilizer level was significant in respect of number of roots hill^-1, fresh weight of root (except at 30 days after transplanting (DAT) and 90 DAT), dry weight of root, fresh weight of above ground plant part (except at 30 DAT and 90 DAT) and dry weight of above ground plant part (except at 90 DAT).

Knowledge Management: Journal