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Amelioration of Salinity Stress on Transplant Aman Rice Through Green Manure and Gypsum

M. Z. Siam
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

S. S. Hossain
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

A. K. Hassan
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

M. A. Kader
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Abstract/ Executive Summary:

A net house experiment was BAU, Mymensingh from July to December 2012 to investigate the ameliorative effect of green manure and gypsum application on the yield of transplant Aman rice variety BRRI dhan40 under various levels of salinity stress. Sodium chloride induced salinity was imposed at tillering stage of plant development. The levels of salinity were 0, 25 and 50 mM NaCl. Green manure@ 0, 5 and 10 t ha ^-1 and gypsum@ 0 and 1 g kg^{- 1} soil were applied to ameliorate the salinity stress effect. 1 g kg^-1 soil were applied to a meliorate the salinity stress effect. Results revealed that the different levels of salinity had significant adverse effect on yield and yield components of rice. All the plants were affected badly when they were exposed to salinity level of 50 mM NaCl. Application of green manure and gypsum helped them ameliorate salinity either individually or in combination at call salinity levels. Grain yield reduction at 50 mM salinity level was 38.64% compared to control which was minimized to 19. 04% by the application of green manure @ 10 t ha^-l .Grain yield reduction was also minimized from 37.08% to 27% at the same level of salinity b, the application of gypsum@ 1 g kg^-lsoil. Similar amelioration effect was also observed in case of straw yield. The amelioration was improved further when both green manure and gypsum were applied. Without any salinity stress grain yield was 4.49 t ha^-1, which was reduced to 2.61 t ha^-l (41.87% reduction) when the crop was stressed with 50 mM salinity. Application of green manure @ 10 t ha^-l and gypsum @ 1 g kg^-1 soil improved grain yield to 4.00 t ha^-l , where yield reduction was just 10.91%. Similar improvement was also found in straw yield. The results of the study conclude that salinity stress in transplant aman rice var. BRRI dhan40 could successfully be ameliorated through application of green manure@ 10 t ha^-l and gypsum@ 1 g kg^-1 soil.

Keywords: Salinity, Aman rice, Green manure, Gypsum

Location: Bangladesh Agricultural University, Mymensingh

Start Date: 00-07-2012

End Date: 00-12-2012

Program Area: Risk Management in Agriculture

Commodity: Rice

Objectives:

To find out the ameliorative effect of green manure and gypsum at various levels of salinity stress on transplant Aman rice.

Methodology:

The research work was carried out at the nethouse of the Department of Agronomy, Bangladesh Agricultural University, Mymensingh from July to December , 2012 using green manure @ 0 , 5 and 10 t ha^-l and gypsum @ 0 and 1 g kg^-lsoil to ameliorate salinity stress levels of 0 , 25 and 50 mM NaCl in transplant Aman rice var. BRRI dhan40. The experiment was laid out in CRD with 3 replications.The soil was dried in sun and loosened and all the inert matter was removed. After that, the soil was filled in the Chari having 60 cm diameter on top and 40 cm in height. Each experimental Chari contained five hills of rice and denotes a replication The applied fertilizer doses per Chari were urea 5.1 g, TSP 1.68 g, MoP 2 . 24 g 1, gypsum 2.24 g , and zinc sulphate 0.035 g . The total amount of TSP, MoP, gypsum and zinc sulphate and one third of urea was applied during the final Chari preparation and the rest of urea was top dressed in two equal splits one at 20 DAT and one at 40 DAT . All the fertilizers were incorporated in the top most soil within 6 inch of the Chari soil. Thirty-day old seedlings were transplanted .Three seedlings were transplanted in each hill. Gap filling, weeding, irrigation and all other intercultural operations were practiced timely. Salinity stress at the levels of 0, 25 and 50 mM NaCl was imposed when the crop was at maximum tillering stage. Gypsum was applied as per treatment specification immediately after salinity stress imposition. For growing BRRI dhan40, BRRI recommendation were followed. At maturity stage the crop was harvested treatment wise and data were collected on yield and yield parameters. The data were statistically analyzed according to Gomez and Gomez (1984). Least significant difference (LSD) was used for mean comparisons.

Source of Information: Bangladesh Agron. J. 2014, 17(1}: 1-10

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results of the study reveal that combined application of green manure @ 10 t ha^-l and gypsum @ 1 g kg^-1 soil ameliorated salinity stress in transplant Aman rice remarkably. The combination of application of green manure @ 10 t ha^-l and gypsum @ 1 g kg-¹ soil increased the grain yield by 4% in case of 25 mM NaCl compared to control while grain yield decreased by 14. 03% when no green manure and gypsum were applied. The combination also minimized the grain yield reduction from 41.87% to 10.91% in case of 50 mM NaCl salinity stress. To validate the result, however, similar experiment needs to be conducted under natural occurrence of salinity stress.

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