- Author: Bruce Linquist
Following my blog post about a week ago about using urea or aqua-ammonia (aqua), a number of people have been asking to see the data. The study was conducted in 2017 at the Rice Experiment Station. Aqua and liquid urea were applied at three rates (50, 100 and 150 lb N/ac). Both N fertilizers were injected into the soil at 3 to 4 inches depth. Treatments were replicated three times. Across the N treatments, yields were similar between the aqua and liquid urea treatments. Yields were low, but overall state-wide yields in 2017 were low as well. In other studies (data not shown), we used dry urea banded into dry soil before flooding to the same depth as aqua we saw almost identical yields across seven on-farm studies. Based on these data, liquid or dry urea that is injected or buried into a dry soil before flooding, performs the same as aqua.
- Author: Bruce Linquist
This morning I was out with several members of our research team on the northwest side of the valley planting a variety trial. The grower we were working with had just finished planting all of his rice acreage (1200 ac) yesterday (April 30). Pretty amazing how fast the rice is getting in this year. I know the west side is often earlier than the rest of the valley; however, growers around the valley are moving much faster this year. By the end of next week, we will likely have all of our variety trials (we have seven this year) planted. We have accomplished this so early before.
This is a good start to the season! Generally, when we plant early, yields tend to be higher. This is clear from the figure below. This figure shows state-wide yield averages from 1994 to 2019 relative to the date when 50% of the rice acreage had been planted (based on USDA data). One reason for higher yields is that dry springs (which allow for early planting dates), also give growers time to prepare their seedbed exactly how they want to without skipping passes. From the UCCE Rice Yield Contest, we have seen that good and uniform stand establishment is a key for high yields. Realizing, that the yield potential may be higher this year, the N fertilizer requirement may be a bit higher. It will be important to access the crop midseason (around PI) to see if the crop may need more N fertilizer to realize its potential. This can be done with either a Leaf Color Chart or the Green Seeker.
The UCCE Rice Yield Contest (http://rice.ucanr.edu/Rice_Yield_Contest/) will be running again this year and we look forward to your participation and learning more about how to achieve high yields. The 2020 forms will be available soon. You will need to enter the contest by the Annual Rice Field Day in late August.
The impetus behind the weed survey is due to the increasing numbers of new weed species that have appeared in the past several years: winged primrose-willow, weedy rice, monochoria, and recently, one (possibly two) new watergrass species. We are hoping that by conducting a survey, we may find some new species before they spread, and better establish ranges for the species we know we have.
A crew of two people will be stopping in random fields in the major rice-producing counties. We will take soil samples from the top six inches of soil in each field. The soil samples will then be processed in a greenhouse at UC Davis, where the weeds will be grown out to identify each species present in the soil. The reason we are surveying this way, instead of surveying during the rice-growing season, is due to the use of herbicides during the season, we would have difficulty seeing the presence of weed species that are well-controlled by the herbicides.
The 2019 Rice Weed Course will take place:
Friday, September 6, 2019
from 8:00AM to 4:10PM (Registration begins at 7:30AM)
Hamilton Road Field (on West Hamilton Rd. between Hwy. 99 & Riceton Hwy.)
and Rice Experiment Station, Biggs, CA
This year will mark the third rice-specific weed course at the Hamilton Road Field and the Rice Experiment Station in Biggs, CA on Friday, Sept. 6, 2019. The day will begin with an interactive field tour of the research plots (Hamilton Road Field) where attendees can get up close to the weeds and rice (bring your boots!) The course will include a hands-on weed identification session on emerging and mature weeds. In the afternoon, speakers will address several pertinent topics in CA rice, including algae, weedy rice, regulatory update, best management for grasses, and how to construct a weed management program. This course is a great opportunity to interact directly with the UCCE and UC Davis Rice Weed Research Team!
For a full agenda and registration go to:
For questions, please contact Whitney Brim-DeForest at 530-822-7515, or by email at email@example.com
Credits for PCA, QAC, QAL, Private Applicator: 6.0 other, 0.5 laws
CA Certified Crop Adviser: 6.0 IPM
2019 Annual Rice Grower Meetings
Sponsored by UC Cooperative Extension
-------------- 5 Locations --------------
WHERE & WHEN
Richvale: Thursday, Jan. 17, 8:30am, Evangelical Church, 5219 Church St., Richvale
Glenn: Thursday, Jan. 17, 1:30pm, Glenn Pheasant Hall, 1522 Hwy 45, south of Glenn
Colusa: Friday, Jan. 18, 8:30am, Colusa Casino Resort, 3770 Hwy 45, Colusa
Marysville: Friday, Jan 18, 1:30pm, Yuba County Government Center, 915 8th St. Marysville
Woodland: Tuesday, Jan. 22, 8:30am, Cracchiolo's Market, 1320 E. Main St. Woodland
TIME: Doors open at 8:00 am and meetings start at 8:30 am at Richvale, Colusa, and Woodland.
Doors open at 1:00 pm and meetings start at 1:30 pm at Glenn and Marysville.
8:00 a.m. (1:00 p.m.) Doors open, sign‐in, coffee
8:30 a.m. (1:30 p.m.) Call meeting to order
California Rice Commission Referendum – Tim Johnson, CRC
8:50 a.m. (1:50 p.m.) Rice Research Board Nominations – Dana Dickey, Rice Research Board
9:00 a.m. (2:00 p.m.) Rice Pesticide and Regulatory Update – County Ag Commissioner
9:15 a.m. (2:15 p.m.) Weedy Rice and Emerging Weed Issues – Whitney Brim‐DeForest, UCCE
9:35 a.m. (2:35 p.m.) Arthropod and Disease Update – Luis Espino, UCCE
10:05 a.m. (3:05 p.m.) Season Review and Fertility Update – Bruce Linquist, UCCE
10:35 a.m. (3:35 p.m.) Weed Control Update – Kassim Al‐Khatib, UCCE
11:05 a.m. (4:05 p.m.) — ADJOURN —
****Applied for DPR and CCA CE credits****