The incidence and severity of white mould (Sclerotinia sclerotiorum) is highly dependent on favourable weather conditions for the disease during soybean flowering. White mould prefers temperatures below 28 degrees C, moist soils, and high humidity. Conditions over the last few weeks have been ideal for the disease in much of Ontario. It’s important to know that this disease overwinters in…
Horst Bohner July 9, 2021 728 Comments Off on Should Nitrogen Fertilizer be applied to “Tile Run” Soybeans?Welcome rains have turned to downpours in some parts of Ontario. In extreme cases, fields have received in excess of 12 inches of rain over a two week period. Excess moisture has resulted in a tremendous number of fields turning yellow (Picture #1). This yellowing is not the result of root rots but largely a nitrogen deficiency. Although root rots…
This article was written by Horst Bohner, OMAFRA Soybean Specialist, and Paul Sullivan, Sullivan Agro Inc. White mould can be one of the most devastating soybean diseases growers face. The extent of yield loss is largely dependent on the inoculum “load” of a field and the right weather occurring during soybean flowering. If the disease was previously a problem in…
Soybean lodging (plants that fall over) can seriously impact yield. Fortunately, it’s often only small portions of a field that lodge. In rare cases whole fields will go down, which devastates yield potential. Light penetration into the canopy during key growth stages will be impeded by lodging, reducing a plant’s ability to produce seed. Lodging that occurs from R3…
Land rolling helps conserve moisture, levels the soil, and pushes small rocks into the ground. Some producers roll immediately after planting, while others wait until the soybeans have emerged. Rolling immediately after planting provides improved seed-to-soil contact and reduces the likelihood of plant injury. But, it also increases the chance of soil crusting, which hinders emergence. Some growers choose to…
Soybeans are prone to poor plant establishment because the seedling must pull the cotyledon seed leaves through the ground to emerge. Plant stand reductions are rarely uniform, which makes the decision to replant difficult. Do not assess a poor soybean stand too quickly, since more seedlings may still emerge. In 2020 we have seen soybeans emerge 40 days after planting….
Prolonged cold weather this spring has led some producers to wonder if soybean planting should be delayed. Over the next few days weather forecasters are even predicting a “polar vortex” with possible daytime highs of 3°C and nighttime temperatures of minus 3. Does this mean soybean planting should be delayed until things warm up? There is an old adage that…
By Mike Staton, MSU Extension Soybean Educator and Horst Bohner, Soybean Specialist, Ontario Ministry of Agriculture, Food and Rural Affairs. Some soybean producers in Michigan are experimenting with ultra early planting dates (late-March to mid-April) with positive results. To date, research trials have not shown a consistent yield benefit to planting this early when compared to planting during the last…
There were a record number of unseeded acres last year. This means not all soybean seed intended for the 2019 growing season was used. Can carry-over seed (grown in 2018) be used successfully in 2020? Before answering that question, it must be stated that soybeans are one of the least storable seeds when compared to many other crops. This is largely because…
Horst Bohner April 1, 2020 1239 Comments Off on Does Soybean Photoperiod Sensitivity Impact Variety Selection?There are two distinct growth stages in many crops; the vegetative and reproductive stages. In soybeans the vegetative stage usually lasts between 30 to 50 days after emergence. Once a flower appears on the plant the reproductive phase has begun. What makes soybean unique is that vegetative growth (leaf number, node number, and dry weight) continues as flowers are formed….
Horst Bohner November 20, 2019 1868 Comments Off on What Causes some Soybean Plants to Remain Green?At harvest individual soybean plants that remain green may become evident. The whole plant or just the stem stays green and there are often fewer pods present on these plants. In severe cases the pods may also be small or rounded and have little or no seed. These pods are called parthenocarpic (seedless). There are a number of causes for…
Horst Bohner May 23, 2019 3389 Comments Off on Is It Time to Switch to Earlier Maturing Soybean Varieties?The spring of 2019 has been unprecedented with excess rainfall and cool temperatures. This has significantly delayed soybean planting. When does it become necessary to switch to earlier maturing soybean varieties? There has been a trend in modern soybean production to plant early and to use long season varieties to achieve higher yields. This strategy has proven effective when soil…
Early planting has been adopted as a management strategy to achieve maximum yield in modern soybean production. There is considerable evidence that soybeans planted in late April and early May yield more than beans seeding during the second half of May. Ontario trials have shown that in some years early planting can provide a 10 bu/ac yield advantage. In the…
Horst Bohner November 23, 2018 11912 Comments Off on Is there a Safe Rate of In-Furrow Fertilizer for Soybeans?Some crops respond well to seed placed fertilizer. Applying phosphorus to wheat in-furrow has become standard practice for many growers. The amount of fertilizer that can be applied safely depends on the crop species, the type of fertilizer, the rate, soil type and soil moisture. Complete crop failures are possible if the seed or seedling is “burned” with excess fertilizer….
Soybeans are incredibly adaptive and can yield well when planted late. Although early May planting is ideal weather in August and September often has more influence on final yield than early planting. When planting is delayed, fewer days are required to reach maturity because of the plants ability to adjust to the season. A one month delay in planting results…