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Blooming Progress (07/13/17)

Most of the broadleaf crops in our area have transitioned from the vegetative stage to the reproductive phase of their life cycle.

Blooming Progress

Most of the broadleaf crops in our area have transitioned from the vegetative stage to the reproductive phase of their life cycle. This 2017 growing seasons has started relatively cool, and in some cases, somewhat dry. Due to the continued dry conditions, some crops are delayed in their development. In Figure 1, the percent bloom is indicated for July 9, comparing 2016 and 2017. All the crops represented in the graph started blooming later than in 2016.

The first soybean flowers, in some of my research plots, were observed during the first week in July.  Usually, after 4-6 trifoliolate leaves have been produced, the soybean plant begins the reproductive period. The first flower can be found lower on the stem and this stage is called R1 and depicted in photo 1 (R stands for reproductive). Full flowering or bloom (R2 growth stage) is reached when a flower is open at the node immediately below the uppermost node with a completely unrolled leaf. The soybean plants will continue to develop new leaves during the flowering period. As weeds are still emerging, it is important to recognize that herbicides usually have a specific growth stage after which application should not take place. It is important to always follow labeled instructions.

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Hans Kandel

Extension Agronomist Broadleaf Crops


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