福岡県農業総合試験場研究報告

福岡県における水稲品種の窒素吸収特性
第２報　‘夢つくし’の窒素吸収量と収量

［摘要］福岡県において育成された良食味品種‘夢つくし’の「理想的窒素吸収パターン」を策定するための第一段階として，幼穂形成期，穂揃期および成熟期までの窒素吸収量と収量との関係について明らかにした。その結果，収量性を重視した場合の目標窒素吸収量は，幼穂形成期までに7gm^－２，穂揃期までに10.5gm^－２，成熟期までに12.5gm^－２であった。このときの穂数は㎡当たり450本で，籾数は32,000粒程度と推定され，収量は高収年に600gm^－２程度期待できる。さらに，成熟期までの窒素吸収量が13gm^－２以上になると倒伏が見られた。

　Influence of Varietal Characteristics and Uptake of Nitrogen on the Growth, Yield and Quality of Rice in Fukuoka Prefecture (2). The Relationship between Nitrogen Uptake and Yield for the Rice Variety of 'YUMETSUKUSHI'. ARAKI Masato, Tomizou YAMAMOTO and Yukie MITSUDA (Fukuoka Agricultural Research Center, Chikushino, Fukuoka 818-8549, Japan) Bull. Fukuoka Agric. Res. Cent. 21: 11 - 15 (2002)

　To establish the optimum method of fertilization to improve yield and quality of the rice variety 'YUMETSUKUSHI' revealed by Fukuoka Agricultural Research Center, we examined the relationship between the amounts of N uptake at three major growth stages (panicle formation stage, full heading stage and harvest stage) and the yield. The results revealed that the amount of N uptake for achieving maximum yield was 7gm^－２ at panicle formation stage, 10.5 gm^－２ at full heading stage and 12.5gm^－２ at harvest stage and a maximum yield of 600gm^－２ can be achieved in a high yielding season. During harvest stage, the number of panicles per m^２ and unhulled rice per m^２ obserbed were 450 and 32,000 respectively. The lodging of rice plants can be noticed if the amount of N uptake at harvest stage is more than 13gm^－２.　