lanting densities
(hill m
2
) were 50 for NPTs and 22.5 for other genotypes in
1999, and 50 for NPT and 25 for others in 2000, because the
first generation NPTs lacked sufficient tillering capacity
(Peng et al., 1994). Each plot consisted of 40 and 26 m
in
1999 and 2000, res