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fieldThe last two days have been rather warm ... in the upper 90's.  I had hoped this week's temperatures would be like last week.  Our field doesn't look as good as it did last week, but that's partially due, not only to the heat, but also, the windy conditions.
plantsPlants in the row still appear to be in good shape.  There aren't as many insects around as there were a couple weeks ago.  Last week I mentioned the plants would start turning a dull green color soon.  The reason for that is the fact the plants are translocating fewer carbohydrates (from photosynthesis) down to the roots, which causes root development to slow and eventually stop, but more importantly, the nitrogen-fixing bacteria are receiving fewer nutrients as well.  When this occurs, the bacteria stop fixing nitrogen for the plants and the plants lose their nice green color.  Our plants are at that stage right now.  We dug up some plants to look at the nodules, but most of them were just empty shells and decaying.  So, there's little or no nitrogen-fixing occurring in our field now.
goodplantsOur first plant still looks good.  It hasn't started to lose any leaves yet.




goodsecondOur second plant is looking good too.  I can see a couple lower leaves turning yellow.  The lower leaves will start yellowing first because they are older and yellowing will move up the plant.


podsIt's easy to find pods (at the four uppermost nodes) with seeds inside that fill the whole seed capsule.  This plant is at the R6 stage of development (green bean stage).  The plant is still taking up nutrients from the soil, but that will slow dramatically within the next two weeks.  Whole plant dry matter accumulation will maximize at the same time.
Trivia Question for the Day: In a pod that contains three beans, which bean is the largest? Is it the first, middle, or last bean? If you guessed the middle bean ... you are correct! How about the next largest? It's the first bean (the bean closest to where the pod is attached to the stem).

Soybean Scene

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