It seems that Pakchong-1 is not superior to Giant
Napier and CO-3, which is at variance with the higher
CP concentration of 16−18% for Pakchong-1 reported
from Thailand (Kiyothong 2014). There are two possible
explanations for the contrast in results between southern
Bhutan and Thailand. Firstly, the study site had only
moderate levels of soil N, which may have affected CP
concentration, since CP in forages is positively
correlated with soil N (Mohammad et al. 1988; Singh et
al. 2000). Secondly, climatic conditions differ greatly
between the 2 countries. Thailand experiences a hot,
humid tropical climate for most of the year, while the
climate of the southern foothills of Bhutan is hot and
humid in summer but cold and dry in winter. While
Pakchong-1 might be ideally suited to a tropical climate,
e.g. in Thailand, it may not perform to its full potential
in the southern foothills of Bhutan.