Compensatory Growth and Yield of Rice Plants Adjacent to Hills Without Plants in Relation to Planting of Young Seedlings
| Autor: | Katsuo Sugimoto, Keichi Samoto |
|---|---|
| Rok vydání: | 1979 |
| Předmět: | |
| Zdroj: | Japanese Journal of Crop Science. 48:214-219 |
| ISSN: | 1349-0990 0011-1848 |
| DOI: | 10.1626/jcs.48.214 |
| Popis: | To analyze the compensatory growth and yield observed in rice plants adjacent to empty hills and to evaluate the limit of the distance between planted and empty hills allowing safe and effective replanting of young seedlings, field experiments were conducted in Central Japan in 1966. Within a plot, the distance between rows was 33 cm and that between hills was 12 cm. As shown in Fig. 1, four treatments consisting of rows where planting was omitted in 2, 3, 4, 5 consecutive hills were set up (treatments 1, 2, 3 and 4). In treatment 5, 2 sets of 2 consecutive hills without plants were separated by a hill where rice had been plantd. Effect of standard fertilizer application was compared in each treatment with that in which fertilizers were not appplied. Results of the experiment can be summarized as follows : 1. Effect of compensation on number of panicles and on yield were nearly the same with or without the application of fertilizers. 2. The rate of increase of panicle number in rice plants adjacent to hills without plants was higher than that of the weight of a head, as compared with controls in plots with or without the application of fertilizers. However the rate of increase of the weight of a head, as compared with controls was slightly higher in plots where fertilizers had been applied. Accordingly the yield component which showed the most significant compensatory effect was represented by the number of panicles. 3. The compensatory effect and yield in plants adjacent to empty hills was particularly evident in plants located in the same row, as compared with those in adjacent rows. Within the same row, plants adjacent to empty hills showed a significant compensatory effect on yield which increased with the distance separating both groups of hills. 4. Yield compensatory effect represented by panicle weight per hill was calculated jointly in fertilized and non-fertilized plots, as the difference in compensation rate between both groups of plots was not evident. Compensatory rates in yield were 99%, 96%, 93∼92% and 98%, respectively in treatments 1, 2, 3 and 4 and 5. 5. Limits of compensation for yield allowing safe replanting of young seedlings were within a distance ranging between 24 to 36 cm (i.e. in treatments 1 and 2). |
| Databáze: | OpenAIRE |
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