I would like to know if it is possible to consider each row of pistachio trees as one block and put each treatment in each block without randomization. Is it called a non-randomized observational study?
Dear Dr. Elaheh Daghighi,
Following information below may be of your interest:
Permuted Block Randomization: Definition & Examples
https://www.statology.org/permuted-block-randomization/
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A HANDBOOK FOR FARMERS AND INVESTORS
https://www.pgai.com.au/wp-content/uploads/2013/01/rirdc-pistachio.pdf
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Understanding Random Forest
How the Algorithm Works and Why it Is So Effective
https://towardsdatascience.com/understanding-random-forest-58381e0602d2
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Dear Dr. Elaheh Daghighi. I would not personally recommend that. It can be done if all other variables and factors, other than the treatment are taken care of. It may include the age and height of the tree, etc. I am not pretty sure what kind of factor you want to control by blocking, is it soil fertility? Irrigation? Wind? Randomization helps to reduce error. Additionally, without randomization, there might be a chance of biasness. I would even suggest to add replicates of each treatment in each block. It is because, in field variables are so many and we cannot control all and we may not even KNOW all.
Thank you @Jawwad Mirza for your complete description of the discussed issue.
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