THE EFFECT OF SOIL AGGREGATE SIZE ON EARLY GROWTH AND SHOOT-ROOT RATIO OF MAIZE (ZEA-MAYS L)

被引:25
作者
ALEXANDER, KG
MILLER, MH
机构
[1] Department of Land Resource Science, University of Guelph, Guelph, N1G 2W1, Ontario
关键词
AGGREGATE SIZE; CARBON ALLOCATION; MAIZE; SHOOT-ROOT RATIO;
D O I
10.1007/BF00012245
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Shoot dry mass and leaf area of 16-d old maize plants decreased as soil aggregate size in greenhouse pots increased in diameter from 0.075-0.5 to 4-8 mm. Root length was also much greater on the finer aggregate beds, due primarily to increased growth of second-order laterals. In a subsequent experiment in which shoot dry matter again decreased with increasing aggregate size, it was found that a similar change in root morphology as noted in experiment I resulted in increased root dry mass as aggregate size increased. The associated change in shoot-root ratio was significant eight days after emergence. This change was due to a change in allocation of fixed carbon rather than allocation of seed reserves. Neither transpiration rate per unit leaf area, nor net assimilation rate were affected by aggregate size. Likewise nutrition could not account for the differences in shoot or root growth.
引用
收藏
页码:189 / 194
页数:6
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