Muhammad Arshad Ullah, Muhammad Rasheed, Syed Ishtiaq Hyder, Raheel Babar
Rice is grown on about one-tenth of the earth’s arable land. It is the single largest source of food energy to more than half of the world population. Salinity confines the efficiency of production at the mature stage. Soil salinity decreases the plant growth rate and can harshly limit the crop production. Salinity tolerance differs extensively between species of plants and within species A pot study was conducted to evaluate the salt tolerance of rice varieties under different salinity cum sodicity levels [S0=2.70dSm-1+ 11.38 (mmol L-1)1/2, S1= 5.16dSm-1 +27.88 (mmol L-1)1/2, S2= 6.15 dSm-1 +30.38 (mmol L-1)1/2 and S3= 6.78 dSm-1 +33.74 (mmol L-1)1/2 ]. Seeds of seven rice varieties namely PB-95, SRI-12, T-05, No 1121, SRI-13, Basmati-515 and Shaheen Basmati were used for screening against salt tolerance in pots with different salinity cum sodicity combinations at green house of Land Resources Research Institute, National Agricultural Research Centre, Islamabad, Pakistan during, 2017. Completely randomized deign was applied with three repeats. Data on grain yield were collected. This study showed significant differences in grain yield with seven rice varieties. At S0 [2.40dSm-1+ 11.38 (mmol L-1)1/2] Basmati-515 rice variety gained the top position in grain yield (4.18 tha-1) and the lowest position was attained by T-05 with grain yield (3.41 tha-1). PB-95 produced the highest paddy yield (3.18tha-1) and Shaheen Basmati attained grain yield (3.06tha-1). All other rice under S1 [5.106dSm-1+27.88 (mmol L-1)1/2] showed the lowest grain yield. Under S2 [6.15dSm-1 +30.38 (mmol L-1)1/2] PB-95 rice variety attained the highest grain yield (2.16 tha-1). Rice line 1121 also received the least position (1.66tha-1) in this salinity level. % decrease at S2 over S0 was indicated salt tolerance of rice varieties. PB-95 rice variety attained the lowest % decrease at S2 over S0 (45.17). PB-95 rice variety attained the highest grain yield (1.08tha-1) at S3 [6.78dSm-1 +33.74 (mmol L-1)1/2]. Rice line 1121 also received the least position (0.62tha-1) in this salinity level. % decrease at S3 over S0 was indicated salt tolerance of rice varieties. PB-95 rice variety attained the lowest % decrease at S3 over S0 (72.58). Therefore, this variety had the maximum salt tolerance than other rice varieties under this experiment.
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