Effect of increasing soil pores by Vetiver grass (Vetiveria zizanioides Nash.) in highland fruit plantation [in Chiangmai, Thailand]
2009
Jiwapornkupt, P., Kasetsart Univ., Bangkok (Thailand). Dept. of Earth Science | Chuchip, P. | Yeesawat, W. | Chaitakhob, N., Kasetsart Univ., Bangkok (Thailand). Agro-Ecological System Research and Development Inst. | Kesjinda, K. | Udomchoke, V., Kasetsart Univ., Bangkok (Thailand). Dept. of Earth Science
The effects of increasing soil pores due to deep tillage by roots of vetiver grass (Vetiveria zizanioides Nash.) in fruit plantation at Saun-Buak-ha, Doi-pui Highland Research Station, Chiangmai province were studied in order to develop a plantation system on highland watershed. Vetiver grasses were planted on the bench terrace surrounding the scion and root stock of 3 species of persimmon (2 years tree). Two half circular rows of vetiver grass were grown around each persimmon tree with radius 0.5 meter and 1.5 meters, respectively. The interval of each vetiver bundle was about 0.2 meters. The stem diameters of scion and root stock of pensimmon were measured every two months. The inner rows of vetiver grass surrounding each persimmon were cut after 16 and 25 months of planting period to increase the soil microspores. Soil moisture content and soil tension were measured to calculate pore size distribution. The results revealed significantly increased of soil microspores (0.19-9 micrometer). Most of the dense root zones were located at 0.5 meter depths. However, the amount of soil micropores at 0.9 meter tend to increase after 25 months. After 38 months of vetiver plantation, the Juhong on persimmon root stock showed maximum diameter and growth rate about 6.11 cm and 0.22 cm per month, respectively, whereas the scion Hongmei persimmon was 5.21 cm in diameter with a growth rate of 0.2 cm per month.
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