The Tropical Fruit Forum
Tropical Fruit => Tropical Fruit Discussion => Topic started by: Capt Ram on January 24, 2018, 05:50:15 AM
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How long does it take foliar feeding to assimilate thru the leaves? For instance if you sprayed at 8 in the morning and it rained at 8 at night I wonder how much has been absorbed through the leaves? And when the when and if that happens should I respray again as though I had not sprayed at all
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https://www.researchgate.net/post/What_should_be_the_minimum_interval_between_a_foliar_application_of_fertilizer_and_a_rain_event_in_order_to_prevent_fertilizer_washout (https://www.researchgate.net/post/What_should_be_the_minimum_interval_between_a_foliar_application_of_fertilizer_and_a_rain_event_in_order_to_prevent_fertilizer_washout)
Fiaz Ahmad
Central Cotton Research Institute, Multan
The rate of absorption by leaves varies among different nutrients so as the age of the foliage. The younger leaves tend to absorb comparatively more quickly as the cuticle layer is not thick. The rate of absorption may be increased by selecting the suitable time of spray. For example spraying in the sunshine hours would quickly evaporate the solution and will thus slow the absorption. Moreover if the plant is under any stress, rate of absorption would slow down. Addition of a surfactant (Tween 20) to the spray solution helps in uniform distribution on the leaved due to decrease of droplet size, and hence efficient absorption. In normal cases (N, P, K) one week interval may be safe period.
Jovino Lopez de Dios
Philippine Rice Research Institute
It depends on type of crop, nutrients being applied and leaf configuration. Generally, few hours after the sprayed material had been dried out is safe enough.
Nazir Hussain
Ministry of Environment Qatar
Fiaz Ahmad mentioned the factors important for absorption of sprayed nutrients, it is a very good explanation. I agree to Dios that in a good shiny day, nutrient sprayed can be absorbed in a few hours. Dr. Anoop Kumar has explained the facts further.
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Wow Thanks Karen-- there's a lot of good info on that link !