Study on irrigated and nonirrigated sedge root systems by soil profile method
1999
Somyot Detpiratmongkol(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Agricultural Technology. Dept. of Plant Production Technology)
Root distribution of three local sedge cultivars under irrigated and nonirrigated conditions was examined. An experiment was conducted at the paddy field of Faculty of Agricultural Technology, King Mongkut's Institute of Technology Ladkrabang, during September 1998 to February 1999. Root depth, root number density (RND) and root length density (RLD) were measured by soil profile wall method at harvest. The results revealed that Chantraburi cultivar had greater average of RND and RLD than Suphanburi and Nakhonnayok. Most of roots were distributed in the upper soil layer and declined exponentially with depth. The RND was closely correlated with soil depth. Approximately 49.1-56.2 percent and 66.7-77.2 percent of RND were in the upper 30 cm of the soil profile for irrigated and nonirrigated sedges, respectively. A greater proportion of total RND and RLD accumulated at the deeper depths in the irrigated than in the nonirrigated treatments. However, the roots of three sedge cultivars under irrigated and nonirrigated conditions could penetrate 100 cm deep in the soil profile, which showed rooting zones of sedges were quite deep.
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