INTERCROPPING UPLAND RICE (ORYZA-SATIVA L.) AND GROUNDNUT (ARACHIS-HYPOGAEA L.) WITH CASSAVA (MANIHOT-ESCULENTA CRANTZ) IN SOUTHERN SUDAN

In two trials cassava (Manihot esculenta Crantz; 'Karangwa', a bitter variety) planted at various densities under rainfed conditions was int ercropped with groundnut (Arachis hypogaea L.; 'Makulu Red') and uplan d rice (Oryza sativa L.; local variety). For the groundnut-cassava tri al, the cassava was harvested after 10 months and 16 months. It was de monstrated that cassava at densities as high as 17 000 plants ha(-1) h ad no significant effect on groundnut yields and that there was little difference between cassava yield at that density and at 5500 plants h a(-1) Cassava alone yielded about twice that of intercropped cassava, but groundnut yields were similar when monocropped and intercropped. L eaving cassava in the ground for 16 months, rather than 10, resulted i n trebling of cassava yield. Cassava growth and yield were higher when intercropped with groundnut than with rice, but rice yielded similarl y when monocropped and intercropped with cassava planted at various de nsities.