Arkansas Rice: Planting Still Ongoing; Preparing for Mid-Season N Applications

©Debra L Ferguson Stock Photography

Crop Progress

“Like the jitterbug it plum evaded me.”  Not sure why rice prices keep climbing like they are, or why rice is still being planted, but here we are on May 47th…  Maybe the kids will dress up as combines to help with the Halloween rice.  We’re definitely spreading out our planting dates some now!

Another week of warm weather – we finally hit the 90-degree mark.  At least for Little Rock that’s the 6th longest it has taken us to achieve a 90-degree day (one more week and it would’ve set the record).  So we’re finally into true rice growing weather and the crop is showing it for the most part.

As happens this time of season when the crop really kicks into gear, the deficiency symptoms start showing up.  With all the other problems going on and the crop otherwise unhealthy they haven’t been too obvious but now we’re seeing them left and right.

Midseason Nitrogen Fertilization Cont.

Plenty of questions keep coming in about midseason N fertilization timing.  Look over Fig. 1.  To consistently achieve greater than 95% of optimum yield with the midseason N application, we need to be a minimum of 3 weeks after the preflood N was incorporated AND be past green ring.

From the data you can see that being even a little later is just as good and sometimes better.  There is also no appreciable penalty for being pretty late with it.  So 3 weeks after preflood N is the beginning of the window, but applying around 4 weeks after preflood N looks even better.

The data is across 2012-2016 at multiple sites each year.  Only two varieties were evaluated in a given year but over the course of the trials Taggart, Cheniere, Roy J, CL152, and Mermentau have been evaluated.

Fig. 1. Yield response to midseason N timing. Click Image to Enlarge

Remember that midseason fertilization recommendations apply only to varieties, not hybrids.  In addition, issues with preflood N applications and early deficiency symptoms may require deviation from the standard recommendation.

Out Standing in Your Field

Fig. 2. Select herbicide drift on rice causing loss of main tillers.

Fig. 3. Newpath tank contamination on conventional rice and the tattle-tale plants.

Fig. 4. Grape colaspis injury and “bean row effect” on rice that didn’t receive an insecticide seed treatment.

Fig. 5. Glyphosate drift on rice.

Fig. 6. Potassium deficiency of rice.

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