　筑後重粘土水田において，大豆後高タンパク質小麦の安定生産技術を確立するために，福岡県の主力品種である‘シロガネコムギ’と‘チクゴイズミ’について最適播種量及び窒素施肥量を検討した。播種量に関しては，‘シロガネコムギ’では標準播種量の10a当たり7kg程度が，‘チクゴイズミ’では標準播種量から2kg減じた10a当たり5kg程度がそれぞれ優れた。また，窒素施肥量に関しては，‘シロガネコムギ’では標準施肥量の10a当たり3+6+2（基肥＋第1回追肥＋第2回追肥）kgが，‘チクゴイズミ’では標準施肥量の10a当たり3+4+2kg，及び基肥省略の0+7+2kgとする栽培法が優れた。

　収量と子実タンパク質含有率の分散分析と播種量間と施肥量間の分散成分の値から，‘シロガネコムギ’に関しては，収量と子実タンパク質含有率の両方が播種量よりも施肥量の影響を大きく受けた。一方‘チクゴイズミ’において，収量は播種量の影響を，子実タンパク質含有率は施肥量の影響をより大きく受けることが示唆された。

This study was carried out to establish a method for a stable yield of high protein wheat to be harvested after soybeans in the heavy clay paddy field of the Chikugo district of Fukuoka prefecture. The optimum sowing rate and the level of nitrogen fertilization of SHIROGANEKOMUGI and CHIKUGOIZUMI, which are the two main wheat varieties of Fukuoka prefecture, were examined.

In SHIROGANEKOMUGI about 7kg per 10 a of standard sowing rate proved excellent, and for CHIKUGOIZUMI about 5kg per 10 a which is reduced by 2kg from the standard sowing rate was optimum. And, in SHIROGANEKOMUGI a formula of 3+6+2 (the basal fartilization + first topdressing + second topdressing) kg per 10 a of standard fertilizer level was just right for the level of nitrogen fertilizer, in the CHIKUGOIZUMI culture technique as 3+4+2kg per 10 a of standard fertilizer level and 0+7+2kg of basal fertilization omission was acceptable.

The correlation of the yield and the grain protein content with the level of nitrogen fertilization was higher than that with the sowing rate, suggesting that the yield and the grain protein content of the seeds were more influenced by the level of nitrogen fertilization in SHIROGANEKOMUGI. In the case of CHIKUGOIZUMI, the yeild was more influenced by sowing rate and the grain protein content rate was more influenced by the level of nitrogen fertilization.