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Asked by maxgxlhi ·September 20, 2018 ·13.9k readers

Knf calculator

Can anyone tell me if the rates in the knf calculator are weekly rates? Or for every watering?  

Top answer

Drake Weinert L4 Instructor · provisional Foundation · Sep 20, 2018
Every time you water these rates and formulations can be used. Most folks do it once or twice a week, and it depends on your cost to benefit ratio. For a large parcel like an orchard, it may be largely infeasible to apply these that frequently. However, if you are doing a small operation on a high value crop, or you have automation to put these into fertigation, then the ease and simplicity makes it possible to apply every time. The only way to 'overdose' your plants is to increase the potency of the formulations, or to simply drown your plants by over application.

From the KNF library

From the KNF library Drafted by Claude from Office Hours and the books · Sep 2026 · 4 sources

The library does not say whether the calculator's rates are per watering or per week.

It does cover how often Drake recommends applying. Drake ranks frequency this way: daily is best, weekly is great, every two weeks is good, and anything less than once a month causes problems. (Office Hours Ep. 157, 18:23)

For the all-purpose maintenance solution, Drake recommends spraying about once a week, or watering it in twice a week as the plant moves through leaf, fruit, and bloom stages. (Office Hours Ep. 24, 28:49)

For market gardening, Drake recommends spraying weekly and alternating through the nutrient cycle, following the book's nine vital solutions and seven prescriptions. (Office Hours Ep. 112, 31:35)

On the calculator itself, the Android KNF Solution Calculator matches Master Cho's numbers exactly. (Office Hours Ep. 67, 38:09)

Sources

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