Abstract: A field trial with fluecured tobacco conducted on a red paddy soil showed that the dry matter accumulation in the tobacco reached a peak in 50～60 days after transplanting,but was lower within 30 days or over 80 days after transplanting.The dry matter accumulation was increased with increasing K application rate and its supplemental proportion.The K content in the tobacco got its peak in 30～50 days after transplanting,and then went down,with the K content at maturing stage being as half as that in the peak period.The K content of the tobacco in each growth stage was obviously higher with 315 kg·hm^-2 K application than with 225 kg·hm^-2 K application.At maturing stage,the dry matter and K contents in the tobacco decreased with 225 kg·hm^-2 K application,but increased with 315 kg·hm^-2 K application,and the K content was higher with 70% K supplemental proportion than with 50% and 30% K supplemental proportion.

Key words: Wheat, Drought, Salt, Stress, Antioxidative defence system