INFLUENCE OF DRY SOIL ON ROOT EXTENSION.
INFLUENCE OF DRY SOIL ON ROOT EXTENSION.
复制标题
干燥土壤对根系伸长的影响。
DOI：
10.1104/pp.6.3.567
复制
发表时间：
1931
期刊：
影响因子：
7.4
通讯作者：
F. Veihmeyer
中科院分区：
文献类型：
--
作者：
A. H. Hendrickson;F. Veihmeyer
Previous work at this Station (2) shows that the percentages for the relative wetness of soils expressed as ratios of soil-moisture contents to their respective moisture equivalents may be used to show the development of roots, and the results of adequate moisture samples, taken at proper times, indicate with a fair degree of accuracy the presence or absence of roots growing in the soils tested. It was further concluded, "that if the soil is wet at the beginning of the growing season to the full depth to which roots of plants would normally penetrate, subsequent additions of water by rain or irrigation, unless adverse conditions for growth are brought about thereby, can have but little influence on the extent of the root system developed. " In connection with the studies from which these findings were drawn, the question arose as to whether roots would elongate into dry soil. SHANTZ (6) believes that some drought resistant plants do have the ability to push their roots through dry soil, but that ordinary field crops do not. MAGISTAD and BREAZEALE (5), also, believe that some plants will send their roots through dry soil and BREAZEALE (1) thinks that roots will elongate into dry soil because of the "build up" of the moisture content of the dry soil by water transported from the roots in moist soil. LIvINGSTON'S work (3) at Tucson, Arizona, shows that the roots of seedlings penetrated downward when the soil was wet from the frequent showers of the rainy season, but there is no evidence in his report to show that the roots of these plants had the ability to traverse dry soils. In the work previously mentioned (2), it was reasoned, largely from theoretical considerations, that roots do not penetrate dry soils. Since the publication of the previous report some simple experiments have been carried out to ascertain the influence of dry soil on root extension.
