稻品種間之混植對産量及農藝性狀之影響

Effects of Mixed Stands of Different Varieties on Grain Yield and Agronomic Characters in Rice

邱善美(S.M. Chiu) ； 黃眞生(C.S. Huang) ； 鄧耀宗(Y.C. Teng) ； 許東暉(T.H. Hsu)

《中華農業研究》 21卷1期 (1972/03) Pp. 1-10

https://doi.org/10.29951/JARC.197203.0001

並列摘要

It is commonly known to the rice growers that the use of pure strain of rice variety may lead to a uniform product and relatively consistent yield. The pure variety, however, is often less flexible in adaptation to different environments. The mixed variety is considered to be more flexible and might be a possible alternative to the pure variety. The purpose of this study is to investigate the changes of grain yield and agronomic traits caused by mixed stands of different varieties.
Three Ponlai rice varieties, Taichung 65 (A), Taipei 309 (B), and Tainung 60 (C) were used as the experimental materials. The mixed stands were made at the time of transplanting according to the treatments. There were 13 treatments, including 3 pure stands and 10 mixed stands. Nine mixed stands were by combining each two of the three varieties in three possible ways and with each combination to have a ratio of seedlings of diffevent varieties per hill to be 2:4, 3:3, and 4:2. The remaining one was by combining three varieties in a 2:2:2 ratio. The randomized complete block design was used, with 3 replications. The spacings of row and hill were, respectively, 25cm. and 20cm. in a 7.7m^2. plot. The total amount of N-P2O5-K2O applyed were 80-60-60 kg/ha. Number of panicles per m^2., length and weight of panicle, number of spikelets per panicle, percentage of filled grains, weight of 1,000 grains, and grain yield were recorded in both 1st and 2nd rice crop in 1970. The results were summarized below:
Taipei 309 (B), in pure stand, was superior to Taichung 65 (A) and Tainung 60 (C) in 1,000 grain wight, percentage of filled grains, and grain straw ratio; but, Tainung 60 had a relatively higher number of grains per plant. The mixed stands exhibited almost intermediate in these traits with their coresponding pure stands. For example, the mixed stands including Tainung 60, which had the lowest number of panicles per m^2, percentage of filled grains, and 1,000 grain weight, got those traits improved somewhat in comparison to the pure stand.
The yield differences among 13 treatments were highly significant in the 1st crop due to the significant yield differences among three pure stands and three mixed stands including the varieties, Taichung 65 and Taipei 309. The 13 treatments though did not show significant yield differences in the 2nd crop, the differences in yield among three pure stands were highly significant. Taipei 309, in pure stand, was always the highest yielder and Tainung 60 was the lowest. The mixed stand including Taipei 309 always showed higher yielding ability than other mixed stands, but still lower than its pure stand. Any mixed stands including Tainung 60 tended to have lower yield.
The results indicates that so far as the three varieties studied, there is no practical value to grow mixed variety instead of using pure stand of Taipei 309, unless significant environmental change favorable to other two varieties occurs.