Influence of nitrogen supply on rice [Oryza sativa] growth and yield in northern Akita [Japan]
1998
Yamamoto, T. (Akita-ken. Agricultural Experiment Station (Japan)) | Dakeishi, S. | Kodama, T. | Hatakeyama, T.
1. The objectives of this study were to enhance the rice yield potential and stabilize the rice production in northern Akita. Differences of growth phase, Yield and yield components between band-dressing near that side of rice seedings (BDS), whole layer application (WLA) and combinations of top dressing of fertilizer were investigated at Oodate (50 meters above sea level) as a typical flat area and Hachimantai (350 meters above sea level) as a typical area among the mountains. And yield components of expected yield was also investigated. 2. In the comparison of growth phase between BDS and WLA, plant length of BDS had been longer than that of WLA and tillering number of BDS had been greater than that of WLA until maximum tiller stage. Panicle number of BDS was greater than of WLA. 3. Yield of BDS in each year was greater than that of WLA. BDS was easy to increase grain number per square meter because of panicle number increasing, however easy to decrease grain number per panicle, percentage of ripened grains and thousand grain weight. 4. When BDS combined with WLA, top dressing at young panicle formation stage increased panicle number and top dressing at meiosis stage increased percentage of ripened grains and thousand grain weight. In addition, multiple application of these two top dressing showed multiplicative effect when no lodging was observed
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