April 17, 2015 No. 2015-8
Dr. Jarrod Hardke
Hurry up and wait. There was very little, if any, progress anywhere in the state this week. The USDA progress report showed Arkansas at 21% planted – I’d say probably 45% of acres south of I-40 are planted and 5-7% of acres north of I-40 are planted (which actually works out to about 20% planted overall if you correct for acreage differences).
Figure 1 shows planting progress information for 2007-2015. Of those 9 years – our current progress is ahead of 4 of the years (2008, 2009, 2013, 2014) and behind 4 of the years (2007, 2010, 2011, 2012). We’re right in the middle – this doesn’t do anything to make anyone feel better, especially those in the north. However, when looked at by week of year rather than just calendar date, you see that we’re not that far off from many recent years. We do need some favorable conditions fairly soon though.
Figure 1. Rice planting progress, 2007-2015.
The rain forecast has backed off considerably this weekend (that doesn’t mean it’s gone away, unfortunately). Figure 2 shows the precipitation forecast for the next 5 days. What you don’t see is a pretty significant drop in total precipitation compared to models a day or two ago. Basically I’m trying to say that less rainfall is better right now, even though everyone is wishing for none.
Figure 2. 5-day precipitation forecast (4/17-4/22).
Plenty of Water for Water Seeding
We talked about water seeding earlier in the year, but it sounds like the practice may be gaining a little more traction right now with the continued wet conditions. Here’s a repeat of that earlier information:
Field preparation – did you prepare the field with water-seeding in mind? If so, get after it when the weather is right. If you didn’t, then there are some factors to consider. If the field is slicked off then you’ll have difficulty getting the seed to hold in place when flown on. A few ways to help with this – pre-sprout the seed, keep a minimum flood depth of no more than a 1-2 inches to minimize seed drift, back the field down to muddy as soon as the seed pegs down.
A completely slicked off field is probably the most risky situation for water-seeding due to the risk of seedling drift. If you have access to a track tractor and a cleated roller, one tactic is to run the roller over the field while it’s a little damp and basically turn the upper 1-inch into “pudding”. Seed flown into the pudding will stick and sink into the mud immediately. Success can be had with this method using dry seed as well as pre-sprouted seed.
Fields that still have a rough surface from discing or other tillage are better candidates for last-minute decisions to water-seed rice. In these fields, pre-sprouted seed will fall to the lowest points, which will be in the cracks created by clods in the field. Follow the other general methods mentioned above, but here the risk of seedling drift is greatly reduced.
For pre-sprouting rice seed: 24-36 hours soaking in water followed by 24-36 hours out of the water – then fly it on.
Seed treatments in water-seeded rice: CruiserMaxx Rice or NipsIt INSIDE treated seed cannot be water-seeded. Period. Labels for the fungicides Apron XL, Maxim XL, and Dynasty do not prohibit aerially broadcasting or water-seeding rice. However, they cannot be pre-soaked – must be flown as dry seed. If you fly dry fungicide-treated seed into standing water you likely won’t get much benefit from them because it will be lost in the water.
Dermacor is the only insecticide-seed treatment labeled for water-seeding in rice. Since rice water weevil infestations are worst in water-seeded rice, this is good since Dermacor is the best seed treatment for rice water weevil management. Seed treated with Dermacor cannot be pre-soaked and must be flown on dry.
We do have a Section 18 for AV-1011 seed treatment that is a bird repellent. Since water-seeded fields can be more susceptible to bird depredation, it’s something to consider to minimize seed loss.
Table 1. Factors for increasing seeding rate for water-seeded rice.
Bacterial Panicle Blight of Rice in Arkansas
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