Field Notes

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Bouldin Alfalfa: 2020-07-08 08:30:00 (DOY 190)
Author: Camilo Rey-Sanchez
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Summary: A-Ci curve measurements. Clipped Alfalfa under the tower

I arrived at 8:30 AM. The sky was clear and there was a mild breeze. The Alfalfa had been recently cut so I took the photosynthesis measurements in the remaining Alfalfa under the tower. I set up a new tent that Joe had to provide some shade for me and the machine during measurements. The measured leaves were fully exposed to the sun. The leaves were smaller than usual and most of the leaves did not cover the 2 cm2 cuvette entirely. The area not covered by the cuvette was estimated based on the projection of the clamped leaf on the 2 cm2 circle. On average there was a 20% of area not covered.

I measured 5 leaves with the first leaf starting at 9:20 AM and the last one at 12:40 pm. The levels of CO2 used in the A-Ci curves were as follows: 400,300,200,150,100,50,400,500,600,700,800,1000,1300 ppm. The light was kept at 1500 umol m-2 s-1 and the temperature was kept ambient. After completing the curve, the leaf was detached and chlorophyll content was measured, and the leaf was collected. I measured a light response curve on the last leaf.

I clipped the alfalfa under the tower after finishing and left at 1:30 PM to do biomass and LAI measurement at Bouldin corn

Next Mowing: 2020-07-31

1 photos found

20200708BA_ACicurvesUnderTent.jpg ( 2020-07-08 09:30:00 ) Full size: 1920x1440
A-Ci curves in the Alfalfa under the tower