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Delta Farm Press
by Jarrod Hardke, Rice Extension Agronomist - June 16, 2023
“Good times, bad times, you know I’ve had my share.”
Widespread rainfall has been the talk of this week (Fig. 1). Beginning last weekend and continuing scattered through this week, most got at
least some of the help they were looking for while a few got a little more than they
bargained for. A shift to more humid, southerly winds has things feeling more like
rice growing weather.
More rain is expected in the 7-day forecast (Fig. 2). Most of that may occur on Saturday night into Sunday, but there are more small
chances scattered later in the week. With that, much of the originally forecast heat
expected to be headed our way looks to be milder now. Highs in the upper 80s appear
likely, but with rice getting to midseason having warm, humid weather and scattered
rain is a sheath blight recipe. Be on the lookout but avoid making too early applications
– we’ll cover more on this topic next week.
Travels around the state continue to indicate a good-looking crop. There are problem
fields for sure, but the majority of the rice is hitting its stride and moving along
Midseason nitrogen application timing is the major topic this week as we start getting
to reproductive growth across many acres. Progress!
Let us know if we can help.
Fig. 1. Last 7-day observed precipitation 6-16-23 (NOAA-AHPS).
Fig. 2. NOAA 7-day precipitation forecast.
Weeds AR Wild Series, S3 Ep12: Midseason Weed Control Topic Rundown
Midseason nitrogen (N) timing recommendations have evolved over the past few decades.
Twenty years ago, recommendations focused on applying midseason N between green ring
and ½” internode elongation; or if two midseason applications are used, the first
is made in the window mentioned and the second approximately 7 days later. Evolution
of new cultivars with enhanced management practices have led to new research and this
is no longer the recommendation due to more recent data.
Fig. 3 shows a summary of midseason N response by days after preflood N incorporation. It
paints a nice picture of our recommended timing for midseason N: wait until at least
4 weeks after preflood N is incorporated AND after green ring before applying midseason
Note that while some newer varieties such as DG263L and PVL03 have not been evaluated
in this type of trial – we do know that they reach reproductive growth stages (green
ring) very fast. This means that applying midseason based off their growth stage
could lead to a very early midseason N application that won’t realize its full potential.
Continue to wait the 4 weeks with these varieties as well.
The need to wait 4 weeks is to allow ample time for the rice to take up the preflood
N. Early application of midseason N, when the rice is still taking up the preflood
reduces the effectiveness of both applications. Imagine working on a nice ribeye
steak and when you’re about ½ way through it someone throws down some bread pudding.
You aren’t going to say no, but you kind of want to finish the steak first.
Now there have been instances where the preflood N rate applied in commercial fields
has been less than recommended or issues cause greater loss of the preflood N. In
these situations, it may be that the midseason N needs to be applied earlier if the
rice is clearly showing signs of running short on N. However, keep in mind that as
rice shifts into the reproductive growth stages, there can be a slight paling as the
plant begins to draw on and use more N. This paling usually only lasts for a couple
of days and is not cause for an early application. Nitrogen is highly mobile in the
plant and is stored in the leaves for the plant to draw from.
For those still kicking around the growth stage side of things, Fig. 4 is included which shows the same data from Fig. 3 but this time grouped by growth stage timing (0 = green ring, 7 = 1/2” internode
elongation, etc.). Here again, applications from green ring to ½” IE do not appear
to be the most efficient, except where those timings coincided with at least 4 weeks
since the preflood N was incorporated.
A final thought – these comments apply to pureline varieties. We do not recommend
midseason N on hybrids. If a noticeable yield response is occurring from a midseason
application to hybrids, then the preflood N rate is likely not high enough and should
be increased in the future. For hybrids we recommend the preflood application and
a late boot application. In rare situations where preflood N is lost there may be
a need for midseason to replace the lost preflood N on hybrids, but otherwise is unnecessary.
We’ll cover more on the benefits of the late boot N for hybrids in the future.
Fig. 3. Grain yield response from midseason nitrogen (N) application by days after
preflood N incorporation across 60+ site-years from 2012-2018 (includes data from
Taggart, Cheniere, CL152, Roy J, Mermentau, CL153, and Diamond).
Fig. 4. Grain yield response from midseason nitrogen (N) application by growth stage
(days after beginning internode elongation) across 60+ site-years from 2012-2018 (includes
data from Taggart, Cheniere, CL152, Roy J, Mermentau, CL153, and Diamond).
A large portion of the rice in the state is now reaching or already at flood and moving
into reproductive growth stages. As a result, it’s important to remember cut-off
timings and season max use rates for herbicide applications. Applications of herbicides
above season use rates or occurring after cut-off dates can result in rice injury
and yield loss. Table 1 provides this information as a quick reference for postemergence rice herbicides.
For additional information regarding max season use rates and cut-off timings of
other herbicides or for other cropping systems, check out the MP566 Application Cut-Off Timings for Common Herbicides and MP567 Max Use Rates per Application and per Season for Common Herbicides. Good luck out there!
Table 1. Rice herbicide cut-off timings and season max use rates.
60-day PHI; ½” IE recommended
8.8 fl oz/ac
No cut-off on label
10 fl oz/ac – Beyond
15 fl oz/ac – Postscript
60-day PHI; green ring recommended
25 fl oz/ac
40-day PHI; green ring recommended
43 fl oz/ac
½” IE; green ring recommended
32 fl oz/ac
60-day PHI ½” IE recommended
5.6 fl oz/ac
12 fl oz/ac
31 fl oz/ac
30 fl oz/ac
12.6 fl oz/ac
6 fl oz/ac
The DD50 Rice Management Program is live and ready for fields to be enrolled for the
2023 season. All log-in and producer information has been retained from the 2022
season, so if you used the program last year you can log in just as you did last year.
Log in and enroll fields here: https://dd50.uada.edu.
The Arkansas Rice Advisor site https://riceadvisor.uada.edu functions like an app on your mobile device. There you can readily access the DD50
program, rice seeding rate calculator, drill calibration, fertilizer and N rate calculators,
publications, and more.
Arkansas Rice Updates are published periodically to provide timely information and
recommendations for rice production in Arkansas. If you would like to be added to
this email list, please send your request to email@example.com.
This information will also be posted to the Arkansas Row Crops blog (http://www.arkansas-crops.com/) where additional information from Extension specialists can be found.
More information on rice production, including access to all publications and reports,
can be found at http://www.uaex.uada.edu/rice.
We sincerely appreciate the support for this publication provided by the rice farmers
of Arkansas and administered by the Arkansas Rice Research and Promotion Board.
The authors greatly appreciate the feedback and contributions of all growers, county
agents, consultants, and rice industry stakeholders.
Rice Extension Agronomist
Extension Weed Scientist
Rice Verification Coordinator
Extension Rice Pathologist
Extension Soil Fertility