Abstract
Salinity causes unfavorable environment that restricts normal crop production. Organic amendments could contribute to the improvement of crop production in coastal areas. Two rice varieties viz. BRRI dhan29 (salt-sensitive) and Binadhan-8 (salt-tolerant) were grown in replicated pots to investigate the mitigation potential of salt stress in rice by organic amendments. Two doses of farm yard manure (FYM: 5 and 10 t ha-1) and poultry manure (PM: 4 and 8 t ha-1) were mixed with soils before transplanting. Rice plants were exposed to different concentrations of NaCl (25 and 50 mM) at active tillering stage. Salt stress caused a significant reduction in growth and yield of both rice varieties. Salt stress also decreased reproductive growth, chlorophyll contents, K+/Na+ ratio, nutrient contents and nutrient uptake in both rice varieties. Salinity caused a significant increase in intracellular proline content in BRRI dhan29 but a decrease in Binadhan-8. Organic amendments with FYM and PM resulted in an increase in growth and yield components, chlorophyll content, K+/Na+ ratio and nitrogen (N) uptake. No plants of BRRI dhan29 survived at 50 mM NaCl stress even after addition of FYM and PM. On the other hand, Binadhan-8 conferred tolerance to 50 mM NaCl stress when soils were amended with organic sources, suggesting that cultivation of Binadhan-8 might be profitable in saline affected areas with organic amendments. The present study suggests that organic amendments with FYM and PM confer tolerance to salinity in rice by increasing chlorophyll content, K+/Na+ ratio and N uptake.Res. Agric., Livest. Fish.3(3): 379-386, December 2016
Highlights
Soil salinity is a major concern to agriculture all over the world because it affects almost all plant functions
Growth and yield of rice Salt stress caused a significant reduction in growth and yield of both salt-sensitive and salt-tolerant rice varieties (Tables 1-3)
Binadhan-8) survived at high concentration of salt stress but did not produce grains. Organic amendments with both farm yard manure (FYM) and poultry manure (PM) resulted in significant increase in growth and yield of both rice varieties under salt stress conditions
Summary
Soil salinity is a major concern to agriculture all over the world because it affects almost all plant functions. Rice is mainly grown in the saline areas but the yield is very low due to lack of salt-tolerant high yielding varieties and inappropriate management practices. Salinity imposes both ionic toxicity and osmotic stress to plants (Zhu 2003). The best means of maintaining soil fertility, productivity and salt tolerance could be addition of organic manures (Das et al 2013). Various organic amendments such as FYM, PM, compost and mulch can be used for the amelioration of saline soils.
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