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Author Topic: Is Phosgard 0-28-25 good for fruiting mango trees?  (Read 982 times)

hawkfish007

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Is Phosgard 0-28-25 good for fruiting mango trees?
« on: April 09, 2019, 05:47:21 PM »
I came across Phosgard 0-28-25 while I was at a local Crop Services Store. I read here non-nitrogen fertilizer is recommended once the fruit has set on mango trees. I bought a 2.5 gallon since it's quite far from my place and I didn't want to drive there for it. Does anyone have experience with Phosgard or similar products, and what is your application rate? Thanks in advance.

Cookie Monster

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Re: Is Phosgard 0-28-25 good for fruiting mango trees?
« Reply #1 on: April 09, 2019, 06:12:45 PM »
P to K ratio seems really high.
Jeff  :-)

hawkfish007

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Re: Is Phosgard 0-28-25 good for fruiting mango trees?
« Reply #2 on: April 09, 2019, 08:16:39 PM »
So 0-28-25 is not recommended even at a lower dosage rate of 2/3 oz per gallon? I can dilute it even further with dosatron anywhere from 1:50 to 1:500, or use it for foliar feeding. I probably won't be able to return it.

simon_grow

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Re: Is Phosgard 0-28-25 good for fruiting mango trees?
« Reply #3 on: April 09, 2019, 09:35:44 PM »
You can still use that product but just dilute it to about one third of what the manufacturer recommends. When you have too much Phosphorus, you can inhibit some of the micronutrients that are especially important for growing Mangos in SoCal. Manganese and Zinc are very important for Mangos growing here so you may want to occasionally spray and or drench with Southern Ag Citrus nutritional spray or a similar micronutrient supplement.

Simon

WGphil

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Re: Is Phosgard 0-28-25 good for fruiting mango trees?
« Reply #4 on: April 10, 2019, 08:14:05 AM »
Our city limits the phosphorus and nitrogen we can use so this would break the law here

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Re: Is Phosgard 0-28-25 good for fruiting mango trees?
« Reply #5 on: April 10, 2019, 09:22:07 AM »
Ideally the ratio is 1 to 5 or 1 to 6 on P to K (not 1 to 1 as this product is). Diluting doesn't change the ratio. Also want to make sure it has a good micronutrient package.
Jeff  :-)

shot

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Re: Is Phosgard 0-28-25 good for fruiting mango trees?
« Reply #6 on: April 10, 2019, 09:24:09 AM »
https://www.farmersbusinessnetwork.com/chemical-labels/9305/Phosgard-0-28-25.90fb63cb454c6fda749167d5ee154d80fe0f4a0f0f72e75c4f39bc5b91c4cfb2.pdf

Read label this is a Phosphite not  phosphate.Very good for root fungus Phytophthora cinnamomi on avocado ect
CAUTION: Do not apply together with copper containing products.Avoid the application of copper containing products 20 days prior to the application of Phosgard and for 10 days after the application of Phosgard.
Dr Crane has good info on use in fl  TREC
« Last Edit: April 10, 2019, 09:28:27 AM by shot »

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Re: Is Phosgard 0-28-25 good for fruiting mango trees?
« Reply #7 on: April 10, 2019, 11:15:59 AM »
Aha! Didn't make the connection. This is like Helena's Ele-max Foiliar Phosphite that I use, a great product but not what I use to provide nutrients.

I use 1/2 cup per 3 gallons of mix, and I mix with copper (label on mine says to avoid copper if pH is below 6).

https://www.farmersbusinessnetwork.com/chemical-labels/9305/Phosgard-0-28-25.90fb63cb454c6fda749167d5ee154d80fe0f4a0f0f72e75c4f39bc5b91c4cfb2.pdf

Read label this is a Phosphite not  phosphate.Very good for root fungus Phytophthora cinnamomi on avocado ect
CAUTION: Do not apply together with copper containing products.Avoid the application of copper containing products 20 days prior to the application of Phosgard and for 10 days after the application of Phosgard.
Dr Crane has good info on use in fl  TREC
Jeff  :-)

hawkfish007

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Re: Is Phosgard 0-28-25 good for fruiting mango trees?
« Reply #8 on: April 10, 2019, 11:30:05 AM »
Aha! Didn't make the connection. This is like Helena's Ele-max Foiliar Phosphite that I use, a great product but not what I use to provide nutrients.

I use 1/2 cup per 3 gallons of mix, and I mix with copper (label on mine says to avoid copper if pH is below 6).

https://www.farmersbusinessnetwork.com/chemical-labels/9305/Phosgard-0-28-25.90fb63cb454c6fda749167d5ee154d80fe0f4a0f0f72e75c4f39bc5b91c4cfb2.pdf

Read label this is a Phosphite not  phosphate.Very good for root fungus Phytophthora cinnamomi on avocado ect
CAUTION: Do not apply together with copper containing products.Avoid the application of copper containing products 20 days prior to the application of Phosgard and for 10 days after the application of Phosgard.
Dr Crane has good info on use in fl  TREC

Itís getting better as I am reading about it more. Phosgard is probably the same rebranded stuff as Helenaís. Do you apply it through foilar feeding or as a drench? My pH is low close to 6, it is probably due to Peterís 20-20-20 with trace elements and cottonseed meal applications.



Cookie Monster

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Re: Is Phosgard 0-28-25 good for fruiting mango trees?
« Reply #9 on: April 10, 2019, 12:23:05 PM »
Foliar. It's part of my anti-fungal routine.

Aha! Didn't make the connection. This is like Helena's Ele-max Foiliar Phosphite that I use, a great product but not what I use to provide nutrients.

I use 1/2 cup per 3 gallons of mix, and I mix with copper (label on mine says to avoid copper if pH is below 6).

https://www.farmersbusinessnetwork.com/chemical-labels/9305/Phosgard-0-28-25.90fb63cb454c6fda749167d5ee154d80fe0f4a0f0f72e75c4f39bc5b91c4cfb2.pdf

Read label this is a Phosphite not  phosphate.Very good for root fungus Phytophthora cinnamomi on avocado ect
CAUTION: Do not apply together with copper containing products.Avoid the application of copper containing products 20 days prior to the application of Phosgard and for 10 days after the application of Phosgard.
Dr Crane has good info on use in fl  TREC

Itís getting better as I am reading about it more. Phosgard is probably the same rebranded stuff as Helenaís. Do you apply it through foilar feeding or as a drench? My pH is low close to 6, it is probably due to Peterís 20-20-20 with trace elements and cottonseed meal applications.


Jeff  :-)

simon_grow

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Re: Is Phosgard 0-28-25 good for fruiting mango trees?
« Reply #10 on: April 10, 2019, 01:58:03 PM »
Ideally the ratio is 1 to 5 or 1 to 6 on P to K (not 1 to 1 as this product is). Diluting doesn't change the ratio. Also want to make sure it has a good micronutrient package.

Iíve been using 0-10-10 products for around 2 decades with great success. You can just use it for your P-K and combine it with other products to get a ratio you want.

Since he has the fertilizer already, he shouldnít just throw it away. Mangos and other fruit actually use some Nitrogen in blooming and fruit formation. Usually some residual complete fertilizer from slow release(summer fertilizer) or saved up in the wood of the trees is enough for the tree when combined with 0-10-10 or similar to stimulate good blooms and initial fruit set.


Simon

Cookie Monster

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Re: Is Phosgard 0-28-25 good for fruiting mango trees?
« Reply #11 on: April 10, 2019, 02:18:38 PM »
Tropical fruit tree fertilizers here generally have something like a 4-1-6 ratio. I do use P (eg, triple super phosphate) if I'm trying to encourage root development, but on the mango that's best in the fall, after harvest and when the tree is naturally laying out new roots.

But, as shot pointed out, phosphite is not really used to provide P. It's an antifungal.

As far as nitrogen goes, mangoes need very little. You can give your mango trees nitrogen to bolster production, as long as you provide enough calcium (a lot of it). Otherwise, you'll get jelly seed. You probably want to time the application to be after flowering as well (most likely not an issue in socal where you guys get hundreds of chill hours per year).

The other problem with N here is that a mango tree can go from 3 gallon pot to 15 feet in 4 years -- not a good thing unless you're wanting a single specimen shade tree and don't really care about hurricanes destroying your trees every few years.

Most other tropical fruit trees benefit from N.

Ideally the ratio is 1 to 5 or 1 to 6 on P to K (not 1 to 1 as this product is). Diluting doesn't change the ratio. Also want to make sure it has a good micronutrient package.

Iíve been using 0-10-10 products for around 2 decades with great success. You can just use it for your P-K and combine it with other products to get a ratio you want.

Since he has the fertilizer already, he shouldnít just throw it away. Mangos and other fruit actually use some Nitrogen in blooming and fruit formation. Usually some residual complete fertilizer from slow release(summer fertilizer) or saved up in the wood of the trees is enough for the tree when combined with 0-10-10 or similar to stimulate good blooms and initial fruit set.


Simon
Jeff  :-)

hawkfish007

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Re: Is Phosgard 0-28-25 good for fruiting mango trees?
« Reply #12 on: April 10, 2019, 03:57:05 PM »
I bought it thinking itís a fertilizer, manufacturer is also promoting phosgard as a fertilizer. I shouldnít have bought it without testing my soil first.
http://jhbiotech.com/docs/Phosgard-0-28-25-Flyer.pdf
« Last Edit: April 10, 2019, 04:06:51 PM by Cookie Monster »

Cookie Monster

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Re: Is Phosgard 0-28-25 good for fruiting mango trees?
« Reply #13 on: April 10, 2019, 04:07:54 PM »
Maybe it's both? Helena markets theirs as nutritional too.

IF it's in a pot, I'd just throw some osmocote (with nitrogen) at it.

I bought it thinking itís a fertilizer, manufacturer is also promoting phosgard as a fertilizer. I shouldnít have bought it without testing my soil first.
http://jhbiotech.com/docs/Phosgard-0-28-25-Flyer.pdf
Jeff  :-)

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Re: Is Phosgard 0-28-25 good for fruiting mango trees?
« Reply #14 on: April 10, 2019, 08:44:59 PM »
Phosphite is said to eventually get transformed into phosphate in the plant.  So it does provide phosphorus nutrition eventually, already inside the plant.  [I don't pretend to understand the chemistry.]

Phosphite is usually sprayed on foliage, or it is sprayed, at very low pressure (even on very windy days), on trunks, with Pentra-Bark adjuvant.  The actual molecule being used, coupled with the usually low rates and the sites of application directly on the trees, makes it unlikely to contribute to any Phosphate excess in soil or in run-off.
Har

 

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