Organic amendments for mitigating soil salinity in rice

Abstract

Salinity causes cellular damage and limits crop productivity. Accumulation of organic compound is one of the adaptive mechanisms to salinity in plants. The experiments were laid out in a randomized complete block design with three replications at the farmer’s field of Botiaghata, Khulna to investigate the mitigating effects of organic manures on salinity stress in rice genotypes during both aman and boro seasons. Two T. aman rice (salt-sensitive; BR-23 and local cultivar; Mohini) and two boro rice (salt-sensitive; BRRI dhan-29 and salt-tolerant; BINA dhan-8) were used as test crops. Farmyard manure (FYM) and poultry manure (PM) were applied to the soils during final land preparation. There were five treatments namely T0= control (no manure), T1=FYM (5 t/ha), T2=FYM (10 t/ha), T3=PM (4 t/ha), T4=PM (8 t/ha).Thirtyday- old rice seedlings were transplanted in the experimental plots. Salinity caused a significant reduction in growth and yield of both aman and boro rice. Under saline condition, BR-23 (aman rice) produced higher yield than local cultivar Mohini in aman season while BINA dhan-8 produced higher yield than BRRI dhan29 in boro season. Soil amendments with FYM and PM significantly increased the growth, and grain and straw yields of all rice cultivars under saline conditions. Increased nutrient uptake and K+/Na+ ratio in rice were also observed due to application of organic manures. No considerable changes in post-harvest soil properties such as pH, EC, CEC and organic matter status of saline soils were observed by addition of FYM and PM. The present study suggests that soil amendments with FYM and PM improve salt tolerance in rice by increasing K+/Na+ ratio and nutrient uptake.
 Res. Agric., Livest. Fish.6(1): 11-17, April 2019

Organic Amendments Improved the Productivity and Bio-Fortification of Fine Rice by Improving Physiological Responses and Nutrient Homeostasis under Salinity Stress

“…Na + /K + is considered a good index for assessing the damages of SS. We noted that SS increased Na + /K + which is consistent with the results of Xu et al [79] and Khan et al [19]; they also observed a significant increase in Na + /K + under SS. However, OA caused a reduction in the Na + /K + ratio, which indicates OA amendments decrease Na + accumulation and increase K + uptake, which maintains a lower Na + /K + ratio [80,81].…”

Tillage operation and fertilizer management effect on yield of boro rice in saline prone zone of Bangladesh

“…Variation in number of panicle m -2 , grains panicle -1 and individual grain weight in different rice varieties in saline soils was also reported by Joseph and Mohanan (2013). Chowdhury et al (2019) found soil amendments with FYM and poultry manure significantly increased the growth, and grain and straw yields of all rice cultivars under saline conditions. In 2019-20, grain yield (6.63 t ha -1 ) were highest in land ploughed at 20 cm depth by 5 times.…”

Effect of Organic Amendments in Soil on Physiological and Biochemical Attributes of Vachellia nilotica and Dalbergia sissoo under Saline Stress

“…Biochar has the ability to reduce toxic elements by the process of adsorption [62]. Salt-affected soil amended with farmyard and poultry manures for rice showed enhanced growth and yield, increased amounts of potassium and K/Na, and increased salt-tolerance [63].…”