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06
Apr
2012
2012 Recommended Nitrogen Rates and Distribution for Rice Varieties In Arkansas
Author: Trenton Roberts, Research Assistant Professor, Crop, Soil & Environmental Sciences

Rice planting is in full swing and with pre-flood nitrogen (N) applications fast approaching careful consideration should be given to identification of the proper N rate and time of application for your rice crop. The 2012 recommended N rates and distribution for rice varieties is now available on the University of Arkansas Division of Agriculture Cooperative Extension Service Website and available on the publications tab listed under the ‘Rice’ heading. Four new varieties were added this year and include Caffey, CL 152, CL 162, and Jazzman-2. The recommended N rates listed here are the base N rate recommendation for rice produced on silt loam soils following soybean in rotation. Please refer to the 2012 recommended N rates table for determining N rates for clay soils and other Early N Rate adjustments.  Caffey (LA) is an early short stature medium grain rice variety and is comparable in maturity to Jupiter and Neptune.  The recommended N rate for Caffey produced on silt loam soils is 135 total lbs N/A applied in a standard two-way split with 90 lbs N/A applied pre-flood and 45 lbs N/A applied at beginning internode elongation (BIE). CL 152 (LA) is an early semidwarf long-grain Clearfield rice variety with very good lodging resistance. The recommended N rate for CL 152 produced on silt loam soils is 150 total lbs N/A applied in a standard two-way split with 105 lbs N/A applied pre-flood and 45 lbs N/A applied at BIE. CL 162 (MS) is an early long grain Clearfield rice variety developed by Mississippi State University. The variety is comparable in height to CL151 but has better lodging resistance and is similar in maturity to CL151. The recommended N rate for CL 162 produced on silt loam soils is 135 total lbs N/A applied in a standard two-way split with 90 lbs N/A applied pre-flood and 45 lbs N/A applied at BIE. Jazzman-2 (LA) is an early-maturing, semidwarf, Jasmine-type aromatic long-grain variety. Jazzman-2 is about 4 inches shorter and 4 days earlier than Jazzman. The recommended N rate for Jazzman-2 produced on silt loam soils is 135 total lbs N/A applied in a standard two-way split with 90 lbs N/A applied pre-flood and 45 lbs N/A applied at BIE. Management of pre-flood N applications is an important component in determining rice yield and disease potential. Please refer to the Rice Production Handbook-MP 192 for more information regarding proper N management for Arkansas Rice Production.

N Fertilizer Recommendations for Rice 2012


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