Study on the Relationship between Seedling Density and Quality of Hybrid Middle Rice
Experimental results showed that the positive effect of seedling density on seedling quality was enhaneed with the increasing of seedling age.No apparent effect was observed on height,dry weight,and leaf area of dry and/or wet raised seedlings.However,significantly negative correlation was obtained between height and dry weight (y 1) of medium and big seedling,tillers of single seedling (y 2) and seedling density (x) with regression eguations was:y 1=a-bx,and y 2=ae -bx ,a and b in the equations rose with the increasing of seedling age;b value in dry raised seedlings was lower than that in the case of wet.The seedling quality began to decrease at the density (plant/m 2) of about 4000 and 2000 for medium and big seedlings (dry raised),respectively;3000 and 1000 for those wed raised ones.The suitable density (plant/m 2) for super efficiency and higher yield was suggested to be about 6400 for smaller seedlings,3000 and 1000 for dry raised medium and big seedlings,respectively;2000 and 4000 for wet raised ones.