Effects of Different Rhizosphere Sizes on the Growth, Distribution Patterns and Utilization of Nitrogen Fertilizers of Different Varieties of Rice Plants (Oryza Sativa L.) on the Same Hill

Japanese Journal of Crop Science

Naomichi TANAKA¹  Kenji AKITA¹  Munetoshi TANGE¹ 

关键词: Inter-hills competition;    株内相互作用;    ^<15>N;    重窒素(15N);    Oryza Sativa L.;    水稲 (Oryza sativa L.);    Partition of Nitrogen;    窒素分配率;   

DOI  :  10.1626/jcs.58.186

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

In order to clarify the inter-hill competition at the maturing stage. Using the tracer 15N method. The growth characteristics of rice plants (Oryza Sativa L., cv. Suweon no. 258 and TKM-6) grown in pots of different sizes were examined. The top dry weights of two varieties, TKM and Suweon planted on the same hill were 82.84% and 16-18%, respectively. In Suweon, the ratio of culm dry weight did not change with rhizosphere size, but the ratio of leaf blade dry weight to the total weight increased with decreasing rhizosphere size; whereas the ratio of the dying organ dry weight showed an opposite behaviour. The percentage of nitrogen content increased with increasing rhizosphere sizes in two varieties, with a greater increase in Suweon. The percentage of nitrogen contents in TKM was higher than that in Suweon in smaller rhizospheres, but in larger rhizospheres Suweon showed a higher percentage of nitrogen than in TKM. The ratio of recovery of 15N top-dressing in basal-dressing plot was 51-79%, at the panicle formation stage plot, 51-59%, and at the reduction division stage plot, 63-78%. Further-more, lager pots and later nitrogen supply showed a high nitrogen content. The ratios of 15N content in the two varieties in basal-dressing plot were 74-84%, and top-dressing at the tillering stage save 76-83%. With TKM top-dressing at the reduction division stage, they were 80-85%, a very high rate of recovery of nitrogen. Partition of 15N content of ears in each top-dressig time in the basal-dressing plot was 37-62%, the tillering stage 53-71%, at the panicle formation stage 63-67%, and at the reduction division stage 54-67%. These results revealed that smaller rhizospheres led to a cleary high partition of nitrogen.

【 授权许可】

Unknown