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We have a simple pro-forma which we print copies of and fill them in by hand ...http://www.bkthisandthat.org.uk/BlankCultivationLog.pdf
I have a small dictaphone in my allotment coat pocket, every morning I walk round the plot and record little notes such as "Monday 18th Sept, weather cool and showery", "Rhubarb will need manuring", "Beans need staking" "Planted out spring cabbage, 9 of 12" "Bring some string tomorrow" then when I get home I can either add the info to my database or put things on a to do list. Or I can leave it for a few days and do those few days all at the same time.I found the dictaphone helps me to backdate things I need to record, not if...but when I forgot to using pen and paper.Steve...:)
Years ago I bought a tall desk diary with a large page per day. Whenever I did anything noteworthy I pencilled in an entry on that day. The following years I continued in the same book while adding the year of action to any new entry. After a few years one could compare times of sowing and harvesting and also look ahead to be reminded of what should come next. I also put detailed receipts of big plant orders in the back to remind me what I had planted out.That makes me look all efficient but of course I like many others don't keep it up to date like I should but the principle is sound.