Seeds planted on high spots are more prone to weed competition, and can suffer moisture stress.
The problem occurs due to the unevenness of fields with the high spots lying above the water level. The problem tends to be more problematic in rainfed areas.
Rice plants on high spots are often water stressed, resulting in:
The pattern of damage is usually in patches.
This field problem has similar symptoms with drough and N deficiency. To confirm cause of damage, check the field level.
Parts of the field are higher than the surrounding area and higher than the average elevation for the entire field. Raised areas often have more weeds.Click on images to enlarge
View full fact sheet: Field level (High spots) on IRRI Rice Knowledge Bank