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This study was conducted to prove the relationship between simulated pecking behavior of <I>Aigamo</I> ducks on rice plants and the rice growth and yield under the rice - duck farming system. The experimental paddy field consisted of two plots, a physical stimulation plot (PS) and a non - physical stimulation plot (NPS) . Twice a day, am10 and pm 5, the physical stimulation to the rice plant was given by gently hitting the bottom part of the plant (100 times) with a stick and by stroking its top part (30 bouts) with a duster. After four weeks, the plant length from the PS was significantly shorter than that of the NPS (P< 0.05), but there was no significant difference in the number of tillers. During the heading stage of the rice plant, the top dry weight of the plant in the PS was significantly less than that in the NPS (P< 0.05), whereas its root dry weight was significantly greater before and after heading (P< 0.05) . The length of the 3 rd and 4 th internode elongation of the bottom part of the rice plant was significantly shorter in the PS than in the NPS (P <0. 05) . The height of gravity center of the rice plants was also significantly lower in the PS (P<0.05) . The lodging resistance of the rice plants in the PS was higher, but the lodging index was smaller (P<0.05) . Both the number of panicles and the weight per 1000 grains were not significantly different between the treatments. The number of spikelets per panicle of the rice plants in the PS was significantly less than that in the NPS (P< 0.05), however the percentage of ripened grains was significantly higher in the PS (P< 0.05) . The yield of paddy rice per unit area was not different between the treatments.<BR>In conclusion, the physical stimulation to rice plants inhibited not only the plant length and internode elongation of the bottom part, but also it affected the top and root dry weight of the plants. Though the lodging resistance of the rice was elevated by the physical stimulation, the rice yield components including panicle number, weight per 1000 grains and paddy rice yield were not affected.
- 日本暖地畜産学会の論文
日本暖地畜産学会 | 論文
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