@article{oai:repository.naro.go.jp:00002411,
 author = {UMEJIMA, Hiroko and SAWADA, Hiroko and 澤田, 寛子 and 牧, 夏海 and OKAMURA, Natsumi and 岡村, 夏海 and MAKI, Natsumi and 深山, 大介 and MIYAMA, Daisuke and 木村, 秀也 and KIMURA, Hideya and 小島, 誠 and KOJIMA, Makoto and 金澤, 健二 and KANAZAWA, Kemji and 松﨑, 守夫 and MATSUZAKI, Morio and 大下, 泰生 and OSHITA, Yasuo},
 journal = {農研機構研究報告 中央農業研究センター, Bulletin of the NARO, Agricultural Research for Central Region},
 month = {Mar},
 note = {We studied the effects of air temperature and precipitation, nitrogen fertilizer and cropping system on grain yield, and quality of wheat variety ‘Satonosora’    in upland fields converted from paddies with Farm- Oriented Enhancement for Aquatic System (FOEAS) in Chiba prefecture. The results are summarized as follows.
1.There was no significant correlation between yield and mean air temperature from sowing to maturity at each field, except for low temperature during the early growth of wheat caused by very late sowing (early in January). However, it was suggested that the grain yield affected by field conditions such as soil moisture and fertility, because the grain yields were lower in the first year than the second year after the field conversion.
2.The grain yield could increase with increased nitrogen top-dressing at jointing stage within the same year, while the other factor(s) could also influence the instability of grain yield. Moreover, the increase in applied nitrogen fertilizer had a low impact on the grain yield, suggested that the wheats harvested after 2015 in these farmer’s field could not use nitrogen effectively.
3.The grain yields and protein contents of wheat in the second-year upland field, following soybean, were constantly higher than those in the first-year  upland  field converted from paddy, following rice. Rice-wheat- soybean crop rotation system of seven-crop per  five- year was adequate for an enhancement of grain yield and protein content in wheat. It was suggested that the higher yield of wheat cultivated following soybean  could be due to an increased supply of available nitrogen from soil organic matters decomposed by the soybean. However, in case of three-years soybean-wheat rotation, the grain yields of wheat decreased compared with those harvested the previous year. Therefore, it was considered that the soil nitrogen fertility in the fields was reduced  by continuous soybean cultivation. We suggested that an application of organic matters, such as manure composts, crop residues, and green manure, is important to obtain stable high yields in paddy rice and upland crops rotation., 千葉県横芝光町の営農組合が保有するFOEAS施工後の水田転換畑圃場を対象に，気象条件， 窒素施用量，作付体系がコムギ「さとのそら」の収量・品質に与える影響を解析した．結果は以下のとおりである．
（１）温暖な本地域においては，極端な遅播き（1月播種）による生育初期の低温を除けば，気 温が収量に及ぼす影響はその他の要因より小さいと考えられた．一方，圃場条件に影響を及ぼす畑転換後年数が収量に影響を及ぼしている可能性が示唆された．
（２）茎立期追肥量を増やすことによって収量は増加傾向にあったが，収量は追肥量以外の要因にも影響されていた．また，窒素施用量の増加に対する収量の増加程度が小さく，施用した窒素を有効に利用できていない可能性が示唆された．
（３）コムギの収量・子実タンパク質含量は，転換 2 年目（ダイズ後作）で転換初年目（水稲後作）よりも高くなった．コムギの収量性向上のためには，麦－大豆作を 2 年続けて行う現行の 5年 7作体系は適切であると考えられた．ダイズ後作における収量の増加には，ダイズの土壌有機物分解能力による可給態窒素供給量の増加が関与していることが示唆された．しかし，ダイズ―コムギ作を 3 作続けた場合，必ずしも収量が増加しなかったことから，ダイズ作によって地力（土壌有機物）が減耗している可能性が考えられた．水田輪作における安定多収のためには，地力減耗を抑制する有機物施用（堆厩肥，作物残さ，緑肥等）が重要になると考えられた．},
 pages = {11--32},
 title = {千葉県の水田転換畑におけるコムギ「さとのそら」の栽培技術の評価—収量・品質の不安定性に及ぼす要因の解析—},
 volume = {7},
 year = {2019},
 yomi = {サワダ, ヒロコ and ウメジマ, ヒロコ and マキ, ナツミ and オカムラ, ナツミ and ミヤマ, ダイスケ and キムラ, ヒデヤ and コジマ, マコト and カナザワ, ケンジ and マツザキ, モリオ and オオシタ, ヤスオ}
}