PREVENTION OF YIELD DECREASE OF RICE PLANT IN COOL SUMMER DAMAGE DUE TO FLORAL IMPOTENCY

摘要

PURPOSE:To prevent a yield decrease of rice plant in cool summer damage due to floral impotency by accelerating insemination of rice and preventing sterilization with spraying gibberellin A4 during the season from boot stage of rice to viviparous blossom stage. CONSTITUTION:1-100 ppm aqueous solution of gibberellin A4 is sprayed to a rice plant preferably together with 10-6-10-1 ppm aqueous solution of brassinoride during the season from boot stage of rice to viviparous blossom stage.