The carbohydrate coontent,nitrogen content and
photosynthetic rate in leaves of four rice va-rieties were studied,using different time and depth
Of submergenee treatments. The results showed that therewere decreases in total
carbohydrate content, photosynthetic rate and C/N rate in leaves of four rice vari-eties,but an
increase in total nitrogen content in leaves of these varieties. The resistance of hybrid
rice(V46and V48)to partial submergence was greater ...