Irrigation scheduling for enhancing seed emergence rate of vegetables in agricultural fields during summer season

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K06307
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 41030:Rural environmental engineering and planning-related
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: Kamayama Koji 国立研究開発法人農業・食品産業技術総合研究機構, 農村工学研究部門, 上級研究員 (90414432)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 出芽 / 夏季 / 野菜生産 / 土壌水分 / 地温 / 夜間

Outline of Final Research Achievements

Enhancement of emergence rate is important to ship systematically products for vegetable productions in outdoors. Because germination and emergence are affected dominantly by water and temperature in surface soils, irrigation management after sowing is of particular importance. In this study, emergences of carrot seeds were measured to investigate proper irrigation scheduling for enhancement of emergence rate in summer. Soil temperatures were varied from 20°C in nighttime to 45°C in daytime in all plots. Because carrot seeds could not geminate over 35°C in the laboratory test, seeds might germinate in nighttime. Experimantal results showed that irrigation in the evening can be effective to increase soil water potential in nighttime and therefore enhance emergence rate of carrot seeds in summer.

Free Research Field

土壌物理，畑地灌漑

Academic Significance and Societal Importance of the Research Achievements

野菜類の種子出芽の安定化は，計画的な生産・出荷において極めて重要であり，畑作農家の収益に直結する問題である．このため，本研究は，土夏期の高温干天時におけるニンジン播種期の出芽を安定化させるための最適な灌水方法を提案することを目的に研究を実施した．