Afandi, . and Manik, Tumiar Katarina and Rosadi, Bustomi and Utomo, Muhajir and Senge, Masateru and Adachi, Tadashi and Oki, Y (2002) Soil Erosion under Co#ee Trees with Different Weed Managements in Humid Tropical Hilly Area of Lampung, South Sumatra, Indonesia. Journal of the Japanese Society of Soil Physics (91). pp. 3-14. ISSN 0387-6012

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Soil loss and surface runo# from farmland under co#ee trees with di#erent weed managements were investigated in Lampung, South Sumatra, Indonesia during rainy seasons from +330 to +333. Three treatment practices investigated were as follows : co#ee without cover crop ; co#ee with Paspalum conjugatum sp. as cover crop, and co#ee with natural weeds. Weed management was done every two week by clearing all the weeds in co#ee plot, and cutting the weeds around the co#ee trees with diameter + m for the weedy plots. The results showed that the maximum daily rainfall and intensity based on +* minutes observation were 2,mm/day and +,* mm/h, however, only +..,�of rainfall intensities was greater than ,/mm/h (classified as erosive rainfall intensity). A relationship between erosivity index (R) and daily rainfall (X) was found as follows : R�+.0,. (X�+*.3), where R : daily erosivity index (m, · t/ha/h) and X : daily rainfall (mm/day). The runo# ratio for cleanoweeded co#ee ranged from 1.* to +/.3�, and decreased after the second year because of the co#ee canopy growth. The presence of Paspalum conjugatum had reduced runo# until zero after the third year, whereas in natural weeds plot, runo# became zero after the fourth year. The highest soil loss was found in cleanoweeded co#ee which reached ,,.1 t/ha in the second year of experiment. The use of cover crop could suppress soil loss until zero after the third year in Paspalum plot and after the fourth year in natural weeds plot. However the good management of weeds as cover crops is necessary due to the bad performance of co#ee growth at both weedy plots. The average soil loss from cleanoweeded co#ee plot was +.,.mm per year which was below the soil formation rate in Indonesia

Item Type: Article
Subjects: S Agriculture > S Agriculture (General)
Divisions: Fakultas Pertanian (FP) > Prodi Ilmu Tanah
Depositing User: AFANDI
Date Deposited: 16 Nov 2017 04:55
Last Modified: 16 Nov 2017 04:55

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