EFFECTS OF INDOLE BUTYRIC ACID CONCENTRATIONS AND MEDIA ON ROOTING OF LEAFY STEM CUTTINGS OF SHOREA PARVIFOLIA AND SHOREA MACROPTERA

An experiment was set up using stem cuttings of Shorea parvifolia taken from coppices of four-year-old stock plants. The bases of these cuttings were treated with indole butyric acid (IBA) of varying concentrations between 2000 and 10 000 ppm. The control was without IBA. The cuttings were planted separately in an enclosed mist propagation system, using three types of media, namely, sand, coconut husk and a combination of sandxoconut husk (1:1). Similar experiment was carried out with stem cuttings of S. macroptera taken from one-year-old potted seedlings. Results showed that 16 weeks after planting, there were significant differences between rooting percentages of S. parvifolia cuttings treated with various IBA concentrations. The highest rooting of 63% was obtained with 8000 ppm IBA compared with only 32% with control treatment. However, no significant difference was obtained in the mean number of roots between 8000 ppm IBA and the control. Similar results were obtained with S. macroptera. However, lower rooting percentage was obtained. The highest rooting of 46% was obtained with 10 000 ppm IBA compared with the 17% with control treatment. Unlike S. parvifolia, means number of roots in S. macroptera was significantly higher when cuttings were treated with 6000, 8000 and 10 000 ppm IBA compared with control. Cuttings treated with 10 000 ppm IBA had 3.1 roots compared with the control (1.7). However, when different types of media was used no significant effect was observed on rooting and number of roots in the two species studied. In both species, cuttings with diameters < 4.5 mm gave better rooting percentages than those with thicker diameters. Satu uji kaji telah dibuat menggunakan keratan batang Shorea parvifolia yang diambil daripada pucuk pokok stok yang berumur empat tahun. Bahagian bawah keratan dirawat dengan kepekatan asid indol butirik (IBA) antara 2000 ppm ke 10 000 ppm berserta kawalan (tanpa IBA). Keratan-keratan ini kemudiannya ditanam dalam media (1) pasir, (2) sabut kelapa dan (3) pasir:sabut kelapa (1:1) dalam sistem pembiakan berenjis yang bertutup. Uji kaji yang sama telah dijalankan ke atas keratan batang S. macroptera yang diambil daripada anak benih tabung berumur satu tahun. Keputusan 10 minggu selepas ditanam menunjukkan terdapat perbezaan signifikan pada peratusan keratan S. parvifolia yang dirawat dengan beberapa kepekatan IBA. Kesemua kepekatan IBA kecuali 2000 ppm didapati menunjukkan kesan yang signifikan berbanding dengan kaw