ABSTRAK<br />Penelitian ini dilaksanakan di Kebun Percobaan Balai Penelitian<br />Tanaman Tembakau dan Serat, Karangploso, Malang, mulai bulan Mei<br />sampai dengan Oktober 2001. Penelitian bertujuan untuk memperoleh<br />varietas wijen yang sesuai pada sistem tumpangsari dengan tanaman jarak<br />kepyar. Rancangan percobaan yang digunakan adalah rancangan petak<br />berlajur dengan tiga ulangan. Perlakuan tumpangsari terdiri dari dua<br />faktor. Faktor pertama yaitu varietas tanaman jarak kepyar Asembagus<br />81 (Asb 81) dan Asembagus 104 (Asb 104). Faktor kedua yaitu<br />varietas wijen Sumberrejo 1 (Sbr 1) dan Sumberrejo 2 (Sbr 2). Pada<br />setiap ulangan juga ditanam varietas monokulturnya. Ukuran petak 6 m<br />x 6 m, jarak tanam untuk tanaman jarak kepyar 2 m x 2 m (satu<br />tanaman per lubang) dan varietas wijen 0,5 m x 0,25 m (satu tanaman<br />per lubang). Hasil penelitian menunjukkan bahwa tanaman wijen varietas<br />Sumberrejo 1 dengan tanaman jarak kepyar varietas Asembagus 104<br />memberikan hasil 632,55 gram biji wijen per petak dan 637,63 biji jarak<br />per petak. Parameter total hasil relatif (RYT) sistem tumpangsari wijen<br />dengan tanaman jarak kepyar lebih besar dari satu ( > 1) yaitu antara 1,687<br />sampai dengan 1,787, sehingga sistem tumpangsari tersebut efisien dalam<br />memanfaatkan lahan.<br />Kata kunci : Wijen, Sesamum indicum L., jarak kepyar, Ricinus communis<br />L., tumpangsari, pertumbuhan, hasil, Jawa Timur<br />ABSTRACT<br />Response of sesamum variety as intercrops with castor on<br />their growth and yield<br />The experiment was conducted in the Experimental Garden of the<br />Indonesian Tobacco and Fibre Crops Research Institute in Malang, from<br />May to October 2001. The objective of the study was to find out the<br />variety of sesame which is suitable for intercropping with castor. A strip<br />plot design was used with three replications. The factorial treatment<br />consisted of two factors. The first factor was castor varieties (Asembagus<br />81 and Asembagus 104). The second factor was sesame varieties<br />(Sumberrejo 1 and Sumberrejo 2). In each replication, castor and sesame<br />varieties were planted as monocultures. The plot size was 6 m x 6 m,<br />castor and sesame plant spacing were 2 m x 2 m and 0,50 m x 0,25 m<br />respectively. The results showed that the intercropping of sesame<br />Sumbererjo 1 variety and castor Asembagus 104 variety produced 632,55<br />gram sesame seed per plot and 637,63 gram seed castor per plot. The<br />highest relative total yield on intercropping castor and sesame was<br />obtained by Asembagus 104 and Sumberrejo 1 at 1,787 and the lowest<br />relative total yield was obtained by Asembagus 104 and Sumberrejo 2 at<br />1,687. RYT value of the intercropping system was more than one which is<br />considered as efficient in land use.<br />Key words: Sesame, Sesamum indicum L., castor, Ricinus communis L.,<br />intercropping, growth, yield, East Java.