|Estorninos JR., L - UNIV ARKANSAS|
|Talbert, R - UNIV ARKANSAS|
Submitted to: Arkansas Experiment Station Research Series
Publication Type: Experiment Station
Publication Acceptance Date: August 1, 2000
Publication Date: N/A
Technical Abstract: A replacement series study was conducted in the greenhouse in 1998 and 1999 to evaluate the growth response of rice cultivars Kaybonnet ('KBNT') and PI312777 when grown together with Katy red rice (KatyRR: presumed cross between rice and red rice) and LA3 (tall red rice from Louisiana). The replacement series also included monoculture of the two red rice ecotypes and two rice cultivars. The proportions were 3:0, 2:1, 1:2, and 0:3 (rice:red rice) plants per pot. Plant heights and leaf areas of both rice and red rice were measured 28, 49, and 70 days after emergence (DAE), and dry weights of plant leaves, stems, and roots were determined. Heights of KBNT and PI 312777 were not different when grown with KatyRR and LA3 until 70 DAE. At 70 DAE, height of KatyRR was reduced when planted with PI 312777 at 2:1 rice:red rice proportions compared to that with other mixtures. LA3 was not affected by the rice cultivars and mixture proportions. Leaf area index of KBNT at 70 DAE was lower than that of PI 312777 at all planting mixture proportions. Relative yield for dry weight of above ground parts of KBNT was lower than that from KatyRR or LA3 which suggests that KBNT was less competitive than KatyRR and LA3. In the PI 312777-KatyRR mixture, the relative yield for dry weight of PI 312777 was comparable to that of KatyRR and LA3. These results were in contrast with previous field results which showed KatyRR to be much less competitive than LA3 against KBNT and PI 312777. Results also indicate that KBNT was less competitive than PI 312777 against the red rice ecotypes.