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Fluid Journal : Fluid Journal 2005-2007
FALL 2007 Fluid Journal 17 DRS. TIMOTHY WALKER, STEVEN MARTIN, JASON BOND, NATHAN BUEHRING In the USA, rice is produced in either water-seeded or delayed- flood/dry-seeded cultural systems. For rice produced in the mid-southern USA, dry-seeding is the predominant seeding method. In this system, rice is typically drill- seeded into soil and grown as an upland crop until the rice reaches the four- to five-leaf stage. Upon reaching this growth stage, a flood is established and maintained until approximately two weeks prior to harvest. The flooded environment Fluid Fertilizer Technology Proving Adaptable To Rice Cultural Practices Mississippi studies show yields greatest when fluids are band applied. has advantages and disadvantages for rice production. Benefits include increased P, K, Ca, Si, and Fe availability and weed control. One disadvantage is that N management is complicated because of N loss mechanisms that accompany the flooded soil environment. Published data indicate that the efficiency of N fertilizers applied to rice can be as low as 20 percent or as high as 70 percent, depending on the environmental conditions present during application. In the SUMMARY Summary: Within the factorial combination of treatments in our studies, an interaction among N source and N rate affected rice grain yield. Rice grain yields were greatest when the quantities of 150 and 180 lbs/A of N were applied as a fluid. Though yields were greater where broadcast N was applied compared to the non-treated control, no difference in grain yield was detected among N rates, and all broadcast granular urea treatments applied at planting were inferior to banded fluid applications. Averaged across sources and N rates, yields were greater when a mid-season N application of 46 lbs/A was applied. Economic analyses of the various treatment combinations indicate that banding fertilizer N at planting produces similar net returns compared with the standard fertilizer source and application method, which generally requires aerial application.
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