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Effect of Sulphur on Rice Under Flooded Condition

R, ISLAM
Department of Soil Science, Dhaka University, Dhaka-2. Bangladesh

M. S. A, HOSSAIN
Department of Soil Science, Dhaka University, Dhaka-2. Bangladesh

A. S. HOWLADAR
Department of Soil Science, Dhaka University, Dhaka-2. Bangladesh

A. ISLAM
Department of Soil Science, Dhaka University, Dhaka-2. Bangladesh

R. MANDAL
Department of Soil Science, Dhaka University, Dhaka-2. Bangladesh

S. M. IMAMUL HUQ
Department of Soil Science, Dhaka University, Dhaka-2. Bangladesh

Abstract/ Executive Summary:

BR3 variety of rice responded significantly to applications of sulphur either in the form of gypsum or as elemental S. The response was more prominent in the soil where the available S content was below the critical level (9.5 ppm). Gypsum appeared to have a more beneficial effect than elemental sulphur on all the growth parameters. An increase of Ca 8% in grain yield was obtained with an application of 30 kg S ha^-l as gypsum. Although sulphur contents in various parts of rice plant varied significantly with different rates of S application, the N and P contents in them remained unaffected. The maximum content of- S was recorded in plants receiving S between 30 and 40 kg ha^-1. Grain S content was significantly affected by S addition from both the sources. The changes in yield parameters as well as nutrient elements were significantly affected by S application.

Keywords: Sulphur, Flooded condition, Yield, Rice

Location: Dhaka University

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To study the effect of sulphur on growth, yield and chemical composition of rice under flooded condition with two soils varying widely in their organic matter and S contents.

Methodology:

Two soils representing the Naraibag and Kalma series were collected to a depth of 0-15 cm from rice growing areas 4.5 kg (2 mm) of air-dried soils were thoroughly mixed with 1.5 kg of washed sand and were placed in earthen pots . A basal dose of N (urea), P (TSP) and K (MP) at the rates of 60, 30 and 30 kg ha^-l, respectively, was used. Two different sources of sulphur viz., gypsum and elemental S, were used to add equivalent amount of 10, 20, 30 or 40 kg S ha^-1 in pots of respective treatment. Control pots did not receive any S. A separate treatment containing only calcium oxide (70.5 kg ha^-1) was included to compare the additional effect, if any, of calcium from gypsum. Elemental S was allowed to oxidize for two weeks before the soils were submerged. Transplantation of two 5 weeks old healthy seedlings of BR3 variety of rice in each pot was done five days after submergence of the soils in order to bring the soils into equilibrium. There were three replicates of each of the treatments. The pots were arranged randomly in the greenhouse. Water level in the pots was maintained at 3 cm above soil surface throughout the growing season that lasted for about three months. The pots were kept weed free. Plant samples (one hill per pot) were collected at flowering stage and at the harvesting stage. At maturity, the grain yield was measured. Soil samples from each pot were collected to measure the changes in available S contents in soil.

Source of Information: Intern. J. Trop. Agri., Vol. V. No. 2, pp. 9310 (June 1987)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Gypsum appeared to have a more beneficial effect than elemental sulphur on all the growth parameters. An increase of Ca 8% in grain yield was obtained with an application of 30 kg S ha-l as gypsum. Although sulphur contents in various parts of rice plant varied significantly with different rates of S application, the N and P contents in them remained unaffected. The maximum content of- S was recorded in plants receiving S between 30 and 40 kg ha^-1. Grain S content was significantly affected by S addition from both the sources. The changes in yield parameters as well as nutrient elements were significantly affected by S application.

Knowledge Management: Journal