Duration of competition and the competitive ability of red rice with rice by replacement diagram
1987
Lee, D.W. | Kim, Y.H. (Kyonggi Rural Development Administration, Suwon (Korea R.)) | Hong, Y.K. (Rural Development Administration, Suwon (Korea R.). Research Bureau) | Son, S.Y. (Chungbuk National Univ., Chongju (Korea R.). Coll. of Agriculture) | Kim, J.C. (Rural Development Administration, Sangju (Korea R.). Yeongnam Crop Experiment Station)
This experiment was conducted to find out the critical competitive period and competitive ability of rice against red rice. Plant height and number of tillers of rice decreased as red rice competing with rice during active tillering stage. The maximum tillering stage of rice competing with red rice took place about 10 days earlier than that of non-competed rice. Significant yield reduction of rice was observed in the plots competing for 20 days after transplanting or longer. Such a yield reduction can be mainly attributed to th1377e decrease in number of panicles per hill and grain number per panicle. In a replacement diagram for rice and red rice their competition was antagonized. The relative total yield was considered lower than 1. Grain number, culm, and panicle length of rice were not affected significantly by inter-specific competition. Rice grain yield reduction was highly correlated with the number of panicles of red rice. Three hundred panicles /m** (2) of the red rice were necessary to reduce rice grain yield by 50 % of the check
显示更多 [+] 显示较少 [-]