Abstract:

In order to provide some available cultural practices to the wide diffusion of ‘Jimai22’, the effect of sowing time and planting density on yield and its components were researched in field by 5 trial sites under 4 different planting districts. The results showed that the effect of sowing time was significant on number of spike per hm2, kernel weight and grain yield, but a little on kernels per spike. While the effect of planting density was significant on both grain yield and its components. The number of spike per hm2 was decreased with the delay of sowing time, while increased with the increase of planting density in an extent. While the changes of kernels per spike were opposite to the former, and the kernel weight was firstly increased and then decreased with the delay of sowing time, decreased with the increase of planting density. Different planting districts showed that marked effect on kernel weight of ‘Jimai22’ and less effect on number of spike per hm2 and kernels per spike. The available sowing time range of ‘Jimai22’ in the four planting districts were as follows: Oct. 8th to 14th for Lunan area, Oct. 6th to 12th for Ludong area, Oct. 1st to 7th for Lubei area, Oct. 10th to 16th for Luxi area. And the available planting density was ranged from 180~240×104/hm2. It was appeared that the increase of kernel weight were more efficient to exert the high yield potential of ‘Jimai22’ in the middle or high soil fertility districts. So in the following planting of ‘Jimai22’, the suitable sowing time and planting density were firstly considered, then some available cultural practices were used to obtain enough spikes, and on this basis, the kernel weight should be increased steadily.