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Seasonal observations of the UCCE Master Gardeners
Flowers
Comments:
by G.G.
on May 27, 2014 at 10:14 AM
Wow you have really made the garden grow! We will see you in August (last week) if you are in town.
by Noreen Martin
on May 28, 2014 at 10:43 AM
Love your blog on fava beans. We enjoyed steamed favas with olive oil and rice vinegar from your garden. Can't wait to plant the fava seeds you shared. N and T.
by Steven Goetz
on June 1, 2014 at 12:17 PM
I grew fava beans as a cover crop this winter. Looking on you-tube, I learned that that if you want to maximize the nitro-fixing benefits, you should cut down the stalks before they start fruiting, as forming the beans drains the nitro from the roots. Is this generally accepted as true?
by Tina Saravia
on June 11, 2014 at 7:54 AM
Although it sounds reasonable, I have not heard of that idea. So I researched your question.  
 
The nitrogen-fixing in the air is actually not done by the plant, but by the rhizobia bacteria in the nodules that form on the roots. In fact, it's a symbiotic relationship between the plant and the bacteria .  
 
Rhizobia bacteria provide the legume plant with nitrogen in the form of ammonium and the legume plant provides the bacteria with carbohydrates as an energy source. The rate of N2-fixation is directly related to legume plant growth rate.  
 
The nitrogen fixing is also affected by other factors like soil temperature, nutrient deficiency, soil moisture condition, which I will not get into.  
 
And I did not find anything in published research that supports that idea of cutting off the stalks before the beans form to get more benefits from nitrogen fixing.  
 
Hope that answers your question.
 
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