Dear colleagues,
I have "leaf Area" measurements using the "LI-3100 Area meter" of cotton plants from different stages on June, July, August and September. The planting distance is 15 cm between plants and 1 meter between rows.
Now, to calculate the LAI I should divide the "leaf Area" measurements / Ground area.
My question is: Should I use a fixed "Ground area" value for all the stages (e.g. 15x15 cm per plant) ?
Or, should the "Ground area" value increase with each stage? and in this case what would be the increase amount?
Thanks in advance for your comments
Hi Ahmed, if you need the actual ground area covered by the cotton plant, here is a close approximation method. Take the sympodial branch length at 50% plant height since it gives you the average spread of the cotton plant considering its pyramidal shape. Then take the inner angle of this sympodium with the main stem. A bit of trigonometry and you get the radius of the plant. Double it to give the diameter of the plant. Convert this to area occupied by the plant. Take at least 5 plants per treatment to get a better result. Can easily be done in Excel. Do this at all the stages since the cotton plant rapidly grows.
PROMISING COMPACT COTTON (Gossypium hirsutum L.) GENOTYPES FOR RAINFED SITUATION BASED ON THE IDEOTYPE CONCEPT
- February 2018
- DOI:
- 10.13140/RG.2.2.27820.41606/1
You need to use constant ground area irrespective of the growth stage of the crop
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