Effects of Different Levels of Salinity on Grain-filling in Rice

Abstract

The study was carried out to determine the duration and grain-filling rate in rice varieties of Kajalsail and Nonabokra under different levels of salinity using BRRI farm soil under greenhouse conditions. Salinity adjusted in soil at the heading stage was 8 ds/m, 16 ds/m and 24 ds/m, respectively. Similarly, tap water was comprised in EC-1.5 ds/m as the control. The duration of the grain-filling period showed variations between two varieties irrespective of salinity levels, and was 15 days after in Kajalsail and 20 days after in Nonabokra. The variety of Kajalsail was more sensitive to salinity levels compared to Nonabokra in respect to the grain-filling rate. Although the relative water content (RWC) of the flag leaf was similar under tow levels of salinity in both varieties, a significant level of RWC was observed in the Nonabokra variety.