English term
follow up two weeks
Fertilizer is the least expensive ingredient, and the most important ingredient after the grass begins to grow. Use as much fertilizer as you dare with each tank load application. Then ****follow up two or three weeks**** after the application and do what ever is necessary to get the property owner to fertilize the grass following the first mowing. Fertilizing makes a big difference!
Per logica intenderei il concetto di attesa e non di ripetizione... ma così non mi sembra scritto.. quindi chiedo la vs preziosa opinione. Grazie
Non-PRO (1): texjax DDS PhD
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Proposed translations
Italy
Life Science specialist, MA.
Native in: Italian
Works in: English to Italian, Italian to English, Russian to Italian
Monitorare per due settimane
Italy
Quality, accuracy and reliability
Native in: Italian (Variant: Standard-Italy) 
Works in: English to Italian, French to Italian, Spanish to Italian
attendere / lasciar trascorrere
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Note added at 7 min (2018-05-02 13:41:13 GMT)
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Errata corrige:
attendere / lasciar trascorrere due settimane
United Kingdom
Translator and Engineer
Native in: Italian
Works in: French to Italian, Portuguese to Italian, English to Italian
Controllare / verificare
controllare / tenere sotto controllo / osservazione
potrebbe essere inteso così
follo up è anche monitorare
Italy
Fast and reliable
Native in: Italian 
Works in: English, English to Italian, Italian
continuare/proseguire per due settimane
Follow up
to increase the effectiveness of by further action or repetition.
https://www.thefreedictionary.com/follow
follow up:
to take additional similar or related action
https://www.merriam-webster.com/dictionary/follow
follow up
continuare
http://www.wordreference.com/enit/follow up
Discussion