2022 Missouri starter fertilizer trials
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"Materials & Methods: Two sites were used for flood-irrigated rice and two were used for furrow-irrigated rice. Flood rice included two rice cultivars, RT XP753 and Diamond, and four starter fertilizer treatments: no starter fertilizer, 100 lbs/ac diammonium phosphate (DAP, 18-46-0), 100 lbs/ac urea (46-0-0), and 100 lbs/ac triple superphosphate (TSP, 0-45-0) applied at 2- to 3-leaf stage. Furrow-irrigated trials used only RT XP753 and 16 starter fertilizer treatments: no starter fertilizer applied; 65, 130, 196, 261, and 326 lbs/ac DAP; 65, 130, 196, 261, and 326 lbs/ac TSP; and 26, 51, 77, 102, and 128 lbs/ac urea. These amounts were selected to provide set amounts of phosphorus, nitrogen, both in combination, or neither to tease out which nutrient or nutrient interaction, if any, would be responsible for differences in yield. A precipitation event of 0.23” occurred at Portageville (FDRC) the day of application, while 0.17” were received at the Rice Farm (MRRMC) 3-4 days after starter fertilizer application. The furrow-irrigated rice fields were also flushed within two days after application. Aside from the starter fertilizer application, all trials were treated according to University of Missouri recommendations for rice production."--Page 2.
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