This paper reviews cassava research in Indonesia prior to 2000 and presents the key achievements in farmer adoption of new technologies to increase cassava yields and income. The improved practices the authors examine include land preparation, erosion control, planting material, plant growth management through plant population and spacing, planting time, weed control, cropping systems and fertilization. The research highlights that cassava planting time is affected by cropping system, soil type and water availability. Planting cassava on medium to light textured soils can be done from the beginning to the end of the rainy season without significant effects on root yield when plants are harvested at 8-12 months, since water availability of 35-60 mm/10 days could be maintained during the first five months. It outlines the optimum plant population for monoculture cassava using non-, late- or branching varieties on poor and better soils: 12,000-14,000, 10,000 and 10,000 plants/ha, respectively. Intercropping systems of cassava with upland rice and other secondary food crops increased Land Equivalent Ration to 1.59, increased net income by 15 per cent, reduced soil erosion by 20 per cent and resulted in a B/C ratio of about 2.80.
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Wargiono J., Widodo Y. and Utomo W.H.
In 'Cassava's potential in Asia in the 21st century: present situation and future research and development needs. Proceedings of Sixth Regional Workshop, Ho Chi Minh, Vietnam, 21-25 February 2000', ed. by R.H. Howeler and S.L. Tan. Pp. 259-278