# Fertilizer rates per plant

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#### bikefoolery

##### Cycling + Beer
I am attempting to figure out the needs of my homegrown hops per recommendation from the Oregon State Univ Extension Service Hops Fertilizer Guide. Obviously a soil test is needed to determine an exact program. But in the absence of a soil test, Id like to break down what professional growers are targeting per plant.

Id like peer review on the numbers Ive come up with. Fertilizer application rates are given per acre in the Guide. Id like to break it down per hop plant. I also find grams are much easier to work with on the my scaled down hop yard.

~826 plants per acre?
An acre is 88 yards by 55 yards. Given 10 ft row spacing, and 5 ft between plants thats 26 rows with 33 plants per row, so 33*26 = 826 plants per acre. Does that make sense?

Max ~87 grams Nitrogen per plant?
With 826 plants per acre, and apply a max of Nitrogen at (150 lb/acre) / (826 plants /acre) = .181 lbs N per plant * 483 grams per lb = ~87 grams of Nitrogen per plant.

Max ~18 grams Phosphate per plant?
With 826 plants per acre, and apply a max of Phosphate at (30 lb/acre) / (826 plants /acre) = .036 lbs P per plant * 483 grams per lb = ~18 grams of Phosphate per plant.

Max ~87 grams Potassium per plant?
With 826 plants per acre, and apply a max of Potassium(K) at (150 lb/acre) / (826 plants /acre) = .181 lbs K per plant * 483 grams per lb = ~87 grams of Potassium per plant.

Obviously these are maximum rates, but to me these seem like very large amounts of fertilized per plant. For example to meet Nitrogen needs, and a fertilizer with N-P-K at 10-3-1, a single plant could need up to 1247 grams or 2.6lbs of fertilizer, with additional K needed.

Thanks for any input.

Cheers,
Bikefoolery

#### Pappers_

##### Moderator
Staff member
Mod
Your precision is admirable. I just take some composted manure, worm casings or other organic fertilizer and add a little bit to each hop hill. Like four or five handfuls.

#### B-Hoppy

##### Well-Known Member
Plants, in general, can perform with a lot of variability, even when grown under exactly the same conditions. Some soil conditions can vary greatly within a few feet. Without submitting a soil sample for analysis, and you making an arbitrary call on the fertilizer program that you're gonna implement, is kinda like me sending the doctor a picture of a bump on my arm and him giving me a diagnosis of what's wrong without any further information. He can be way off with his answer without being able to obtain any further info about the situation.

In your case, I would take a page out of Pappers' book and just use some compost or well-rotted manure to topdress each crown. This method will supply the plants with a steady, slow dose of nutrients without really overdoing any particular ones. The compost/manure will also act as a soil amendment over time. You're the boss so have at it.

#### Greatlakeshops

##### Well-Known Member
Remember that they are recommending total fert per year - not in one app.
Most guys run 75 to 150 lbs N /Acre/year depending on soil type. It is actually more important to get the right nutrient there at the right time -ie. Nitrate in spring, Potassium in fall. Hops don't require much Phophate, but LOVE micros - FE, CA , Mg, Mn, B, Zn. Pappers and B_Hoppy are right about the composted manure - it feeds and supplies everything without a lot of thought or calculating. You just retest each fall and add what comes up short. Search the web - there are a lot more fert guides out there than Oregons If you're doing a liquid feed thru dripperline, I use 18-5-9 @ 125 ppm at every irrigation cycle as my base fertilizer. That's based on my alkalinity of about 180 and pH float at 6.2-6.5. Hope this helped- a bit techy but you seem able to use it.