Studies on Cover-Culture of Tobacco : 5. Effects of plastic film mulch on tobacco in the early stages of growth

[摘要] This experiment was performed to investigate the relation between growth of tobacco and soil temperature affected with plastic film mulch which is now getting popular in tobacco cultivation. The results were summarized as follows : (1) The number of total leaves of mulched tobacco was larger by two (on tobacco transplanted on April 5) and three (on tobacco transplanted on March 23) leaves than that of the unmulched. This increase in number of total leaves was thought to be dependent upon the rate of leaf initiation increased by changing of soil temperatures to higher levels with the aid of mulching. (2) Dry root weight of mulched tobacco was greater than that of the unmulched through early stages of growth. For example, dry root weight of mulched tobacco, transplanted on March 23, was 40 per cent more than that of the unmulched ones grown for 28 days after transplanting. (3) Total absorbed nitrogen per plant of mulched tobacco was twice as much as that of tobacco growm on bare ridge for 28 days after transplanting.

[学科分类] 农业科学（综合）