Jim Specht
As seen in:
CSIRO Publishing,
Farm Progress,
Midwest Messenger,
Star-Herald,
Farms.com,
AgFax,
Nebraska CropWatch
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Articles by Jim Specht
Post-harvest Measurement of Soybean Seed Number and Seed Mass Contributions to Final Seed Yield
Key Points Crop water stress during the R5-R7 seed-filling stages can substantially lessen the size (mass weight) of the seeds developing in the pods, thus impacting final yield. Seed size comparisons from non-irrigated and irrigated areas pre-harvest can better aid in predicting yields (or in helping explain high/low yields post-harvest).
Premature Frost Damage to Crops
Storm damage led to a high amount of replant crops in Nebraska this year. With freezing temperatures occurring on Oct. 8, 2022 and another frost anticipated this weekend, what can growers expect going forward? Key Temperatures Temperatures at 31°F for a few hours will kill leaves, while temperatures at 28°F for a few minutes can kill the plant, including the stalk of corn and soybean. Four hours at 24°F or lower will freeze the growing point at the top of alfalfa.
Q/A: Questions about Soybean Emergence and Stands
Q: What’s Causing Problems with My Soybean Emergence and Stands? Row Width (inches)Row Length Representing 1/1000th of an Acre (feet and inches) 7.5 69’ 7” 10 52’ 3” 15 34’ 10” 20 26’ 2” 30 17’ 5” 36 14’ 6” A: What we’ve specifically seen in field situations in 2021 is generally harder soils due to lack of freeze/thaw this winter and crusting due to some hard rains/wind.
Chilling injury in corn, soybeans
Friday morning at Mead, Nebraska, the 4-inch 24-hour average soil temperature was 52 degrees. On May 1, it was 65 degrees. With these recent cold temperatures, there has been some concern about chilling injury to corn and, more importantly, soybeans. If you're considering going to the field this week to start planting, be sure to check predicted temperatures for the critical 48 hours after planting as well as average soil temperatures for the previous seven days to avoid germination problems.
Understanding the Soybean Germination Process for Early Planted Soybean Decisions
Planting is anticipated to begin for many growers in Nebraska the next few weeks. Based on formal research reports showing increased yields, we have recommended early soybean planting beginning mid- to late- April. This article will take a deeper look into the research on the soybean germination process, particularly when chilling injury can occur, and factors to consider when planting soybean early.
Reverend Voyce and Père O’Reilly’s excavated collection from Bougainville: a case study in transnational histories of archaeology in the Pacific
RESEARCH ARTICLE Previous Next Contents Vol 32(1) Eve Haddow A B G , Emilie Dotte-Sarout C D and Jim Specht E F + Author Affiliations - Author Affiliations A School of Archaeology and Anthropology, The Australian National University, ACT 2601, Australia. B School of Social Science, The University of Queensland, St Lucia, Qld 4072, Australia. C School of Archaeology and Anthropology, The Australian National University, ACT 2601, Australia.
Taking Note of the Ending Reproductive Stages of Your Soybean Crop
By Jim Specht, Keith Glewen.et.al Nebraska’s 2019 soybean crop is nearing the end of its life cycle. Growers have asked how to differentiate these final stages and what impacts the impending frost/freeze may have on soybean. Determining R7 Stage R7 is defined as the calendar date when 50% (or all) of the field plants possess one mature pod. In most years, most leaves and pods will have changed color (from green to yellow-green or yellow) by this plant-based R7 date.
Taking Note of the Ending Reproductive Stages of Your Soybean Crop
By Jim Specht and Keith Glewen et.al. The heat and drought in areas of the State are rapidly moving Nebraska’s 2020 soybean crop along. Growers have been asking how to determine late season growth stages for last irrigation of the season and for determining maturity. The following is an updated article from October 9, 2019. While we’re not anticipating a frost anytime soon, the original article also spoke about frost impacts.
Projecting Dates for Ending Reproductive Stages of a Soybean Crop Using SoyWater
Background Soybean plots planted for the August 23 Soybean Crop Diagnostic Clinic near Mead are now demonstrating the effects of planting date and maturity group on the timing of late reproductive stages. One field demonstration at the Eastern Nebraska Research and Extension Center (ENREC) involved planting four-row strips of four soybean varieties differing by one unit in maturity group (i.e., MGs of 1.1, 2.1, 3.1, and 4.1) on four planting dates.
Will my late planted soybeans mature before a killing frost?
The question on many farmers' minds revolves around the maturing of soybeans as August begins. Aug 01, 2019 By Lindsay Chamberlain (UW), Jim Specht (UNL) and Shawn P. Conley (UW) August 1st is right around the corner and crop maturity timing concerns have erupted! These concerns are amplified in 2019 due to historically low GDU accumulations and late plantings that have significantly delayed overall soybean crop progress.
Will My Late Planted Soybeans Mature Before a Killing Frost?
Authored by Lindsay Chamberlain (UW), Jim Specht (UNL) and Shawn P. Conley (UW) August 1st is right around the corner and crop maturity timing concerns have erupted! These concerns are amplified in 2019 due to historically low GDU accumulations and late plantings that have significantly delayed overall soybean crop progress.
Nebraska: 4 Corn, Soybean Planting Considerations
©Debra L Ferguson Stock Images Everything we do at planting sets the stage for the rest of the year. We’re blessed to have equipment that can allow for many acres to be planted in a short time. And, we have the ability to mess up a lot of acres in a short time. The following are research-based tips for consideration. 1. Proper Soil Conditions Compaction can occur from driving on or tilling in wet soils, creating clods and hard pans.
Considerations when Planting Soybean Early
By Jim Specht, Jenny Rees, Roger Elmore, Nathan Mueller, and Keith Glewen More growers are planting soybeans in mid- to late April to take advantage of the greater yield potential from earlier planting. In Nebraska, research has shown that soybean yield declines about 1/4 to 5/8 bushel per acre for each day planting is delayed after May 1. Recent research in Illinois indicates a 0.7 bu/ac decline in yield per day of planting delay.
Corn and Soybean Planting Considerations
By Jenny Rees, By Roger Elmore, and Jim Specht Everything we do at planting sets the stage for the rest of the year. We’re blessed to have equipment that can allow for many acres to be planted in a short time. And, we have the ability to mess up a lot of acres in a short time. The following are research-based tips for consideration. Proper Soil Conditions Compaction can occur from driving on or tilling in wet soils, creating clods and hard pans.
Considerations when Planting Soybean Early
More growers are planting soybeans in mid- to late April to take advantage of the greater yield potential from earlier planting. In Nebraska, research has shown that soybean yield declines about 1/4 to 5/8 bushel per acre for each day planting is delayed after May 1. Recent research in Illinois indicates a 0.7 bu/ac decline in yield per day of planting delay.
Three key considerations for planting corn, soybeans - starherald.com: Farm And Ranch
Planting as early as is reasonably possible allows your crop to collect solar radiation sooner. This also carries risks that should be weighed against the benefit. These risks include, but are not limited to: •losing crop insurance benefits by planting before “earliest” planting dates, We have used your information to see if you have a subscription with us, but did not find one.Please click the button below to Start a new print or online subscription.
Corn and Soybean Survival in Saturated and Flooded Soils
REVISED: May 24, 2024 (originally published May 7, 2015 by authors Roger Elmore and Nathan Mueller) Key Points Cool air temperatures will help increase the possibility of survival, but germinating corn seed and plants would not be expected to survive more than four days in flooded and saturated soils. Corn from emergence to V6 can live four days under water if air temperatures are lower than the high 70s. Seedlings may survive one day when air temperatures are greater than that.
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