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Application of Ash for Amelioration of Salinity Effect in Rice

A. H. F. Fahim*
Scientific officer,
Spices Research Centre, BARI, Shibganj, Bogra, Bangladesh

M. A. Kader
Department of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh

M. S. Nahar
Scientific officer,
Spices Research Centre, BARI, Shibganj, Bogra, Bangladesh

M. A. Wadud
Scientific officer
Spices Research Centre, BARI, Shibganj, Bogra, Bangladesh

M. A. Islam
Senior Scientific officer,
Spices Research Centre, BARI, Shibganj, Bogra, Bangladesh.

Abstract/ Executive Summary:

Agricultural land use in coastal area covers 53% and the lands are mostly affected by salinity. Besides, the average yield of rice in these areas is very low due to salinity. Although, BRRI has developed salt registrant rice varieties, the average production can be improved through soil management. Thus, a pot experiment was conducted in the net house of Department of Agronomy, Bangladesh Agricultural University, Mymensingh, during March to August 2010 to investigate the ameliorative effect of ash application on yield and yield attributes of rice under various salinity levels. Rice var. BRRI dhan47 (a salt tolerant variety) was used in the experiment. The sodium chloride induced salinity levels were 20, 40, 60, 80 and 100 mM NaCl and the levels of ash applied were 1.5, 3, 4.5 and 6 t ha^-1. Results revealed that the different levels of salinity had significant adverse effect on plant height, tillers hill^-1, panicle hill^-1, grains panicle^-1, 1000-grain weight, grain yield, biological yield and harvest index. All the plants eventually died when they were exposed to salinity level of 40 mM NaCl or more and could not survive up to maturity. Application of ash enhanced the yield attributes and yield of rice under different salinity levels compared to those without ash. It was concluded that application of ash at the rate of 6 t ha^-1 ameliorated the salinity stress effect on rice yield of BRRI dhan47.

Keywords: Salinity, Ash, Stress, Rice, BRRI dhan47

Location: At the net house of the department of Agronomy, Bangladesh Agricultural University (BAU), Mymensingh

Start Date: 00-03-2010

End Date: 00-08-2010

Program Area: Risk Management in Agriculture

Commodity: Rice

Objectives:

The present study was under taken to investigate the ameliorative effect of ash on grain yield and yield attributes of rice var. BRRI Dhan47 under various salinity levels.

Methodology:

The experiment was conducted at the net house of the department of Agronomy, Bangladesh Agricultural University (BAU), Mymensingh during the period from March to August, 2010. The experimental site was located at 24o N latitude and 940 E longitude and 18 meter above sea level. The experimental site belongs to the Agro-ecological Zone of the Old Brahmaputra Floodplain (AEZ 9). The soil was collected within 6 cm from the top soil. The experimental soil was loamy in texture having a soil pH value of 6.43, moderate in organic matter content. After collection, the soil was dried in sun and loosened. All the inert matter was removed. The pots were filled up by soil.

Bangladesh Rice Research Institute (BRRI) has developed var. BRRI dhan47 as a salt tolerant variety for boro season as the test crop. This variety can tolerate 12-14 dSm-1 salinity at seedling stage and 6 dSm-1 salinity for whole life The var. BRRI dhan47 matures within 150 days after transplanting. It attains a plant height of about 105 cm. The average yield of BRRI dhan47 is 6.1 tha-1 under normal condition and around 4 tha-1 in saline (BRRI, 2007). Five level of ash (viz. 0, 1.5, 3, 4.5 & 6 tha-1) and six salinity level (viz. 0, 20, 40, 60, 80 & 100 mM NaCl) were used as treatment variables. The experimental was laid put in a factorial Randomized Complete Block Design with five replications. The total number of pots used in this study was 150 (6 x 5 x 5). Seeds of var. BRRI dhan47 were collected from BRRI Gazipur. Seeds were soaked into water in buckets for 24 hours and then taken out of water and incubated in gunny bags for sprouting. Sprouted seeds were sown on 21 March 2010 in the nursery bed.. Plastic pots were selected for the experiment to check the loss of saline water. The size of the pot was 13.5 cm diameter in top and 30 cm in height. Each of the pots was filled with 14 kg of the collected soil and fertilized with urea 25, TSP13, MoP 9 , gypsum 8 and zinc sulphate 1.5 g/ pot. The total amount of TSP, MoP, gypsum and zinc sulphate and one third urea was applied during the final pot preparation and rest of the urea was top dressed at 20 and 40 days after transplanting (DAT). Seedlings were uprooted from nursery bed on 27 April 2010 and transplanted immediately at 3 seedlings hill^-1. The insecticide Basudin 10 G @ 20 kg ha^-1 were applied to control rice stem borer. The salinity was applied at tillering stage and ash was applied at final pot preparation mixing within 6 cm of the potted top soil. The roof of the net house was covered with thin polythene sheet to protect the pots from rain water. Harvesting was done on 30 August 2010. Data on plant height, tillers hill^-1, grains panicle^-1, 1000-grain weight, grain yield (t ha^-1), straw yield (t ha^-1) and harvest index (%) were recorded properly.

The collected data were analyzed statistically following the analysis of variance (ANOVA) technique and the mean difference were adjudged by Duncan’s Multiple Range Test (DMRT) using the statistical computer package program MSTAT-C (Gomez and Gomez, 1984).

Source of Information: Bangladesh Agron. J. 2017, 20 (1): 31-36

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It can be concluded that, application of ash ameliorated the salinity stress effect on rice yield. It was also found that, the salt tolerance level of rice var. BRRI dhan47 was 20 mM NaCl when cultivated with 6 ton ha-¹ ash .

Knowledge Management: Journal