Study on the Salt Tolerance of Rice and other Crops in Reclaimed Soil Areas 15. The Effects of Salt on the Efficiency of Sunlight Utilization of Rice Canopy in Reclaimed Saline Soils

간척지에서 수도 및 기타 작물의 내염성에 관한 연구 15. 간척지에 재배한 수도 엽층의 수광 효과에 미치는 염분의 영향

In order to observe the factors affecting light utilization efficiency in the canopy of a rice crop grown in reclaimed saline areas in Korea, 22 varieties of rice were cultured at the average salt concentration of 6.05mmhos/cm $25^{\circ}C$, (0.39%) in saline soils and non-saline silty loam soils. The inhibition of tillering ability by salt damage at the maximum tillering stage was greater than to growth in height. A significant direct correlation was observed between both ratios and salt concentration with each variety. In the salty areas the length of the flag leaf of the maturing stage showed a positive correlation with the production of rough rice while other living leaf showed a negative correlation. LAI of maturing stage was less in the salty area than in the non-salty area, while the former showed higher ratio in net assimilation and translocation to head with greater RGR before and after the heading stage.