Nitrogen deficiency of maize in the farmer's fields of Iwate prefecture

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K15512
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 39020:Crop production science-related
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: Fujisao Kazuhiko 国立研究開発法人農業・食品産業技術総合研究機構, 東北農業研究センター, 研究員 (30837365)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: トウモロコシ / 窒素不足 / 生産者圃場

Outline of Final Research Achievements

This study aimed to evaluate nitrogen deficiency of maize cultivated in the farmer's fields of Iwate prefecture. The results revealed that nitrogen deficiency occured in the fields where the total nitrogen content in the soil was low. Specifically, nitrogen deficiency occurred particularly around the silking stage when the total nitrogen content was below 3 g/kg. In these fields, it was estimated that an average loss of 2.2 t/ha in dry matter production occurred during approximately one months from the silking stage. Consequently, it was inferred that the application of nitrogen during the ripening period, such as through the use of compost, is necessary in fields with low total nitrogen content in the soil.

Free Research Field

作物学

Academic Significance and Societal Importance of the Research Achievements

本研究は生産者の圃場において窒素不足が生じやすい環境を示すと共に、生育期間中に窒素不足が生じた時期を示しており、肥培管理を検討する上で基礎的な結果を得た。また、窒素不足に起因して損失した乾物生産量を示したことで、経済的な観点から検討するためにも必要な結果を示した。本結果は農業での効果的な肥培管理を検討する上で有用な知見を示したと考えられる。