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Liquid fertilizer rates - need some help

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ShepFL

05-29-2004 16:43:09




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I normally use 20-0-20 granular as final feeding for my beans and corn. This yr. unable to locate any; checked 8 places, must be timing. Local supplier told me just to use 14-0-46 but not as much as I would with 20-0-20. Now that I have it I have encountered my next road block.

How do I convert this rate to liquid fertilizer 14-0-46 to ensure I have the correct mixture?
My side dress rate for 20-0-20 is roughly 36# / 600 ft. row of corn or 3,600# for 100 rows. I am thinking of 1 oz. / gal.

Will be using my 25 gal. ATV sprayer to apply. Thanks in advance.

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Hal

05-29-2004 20:35:50




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 Re: Liquid fertilizer rates - need some help in reply to ShepFL, 05-29-2004 16:43:09  
That seems like a pretty high rate for sidedress. If you were really running 36# alongside EACH 600' of row, and lets just assume the rows are spaced at 36" for now, you would be putting on about 900# of product per acre; if your rows are narrower you would be putting even more per acre. 900# of 20-0-20 product would be 180# of N and K per acre, very high!. Is this what they recommend on your soils in your area? Remember you said it has been dry, so very little N has been lost to leaching. If I were you I would apply it dry at whatever you determine the proper rate to be and then irrigate with .5" of water.
Are you using the sprayer because that is all you have? I assume the Bulldog is water soluble; you will have to know how many lbs you can disolve per gallon. I never used it but I believe commercial premixed liquid fertilizer runs a little under 11# per gallon.
If you are thinking about only mixing 1 oz with a gallon (which doesn't sound right) you will be there forever. You will have less than 2 pounds in your 25 gallon tank, and how far would you want the 2 pounds to go. Maybe you meant 2# disolved in a gallon; that would make more sense since now each gallon would weigh 10 lbs and you would have 50 lbs in your 25 gallon tank. But you would have to find out if the Bulldog will disolve 2# in a gallon without settling out.
If your soils are sandy and porous and you are using irrigation, you are better to make several split application of nitrogen just before applying the water. Also on sandy soil you should be doing smaller apps of water at more frequent intervals. I would think that 300-400 pounds of that stuff would be the most to apply at any one time. Good luck with your plants and the weather.

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ShepFL

05-29-2004 23:07:32




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 Re: Re: Liquid fertilizer rates - need some help in reply to Hal, 05-29-2004 20:35:50  
third party image

Thanks Hal -
The recommendation is 200# of N per acre. My soil tests recommend 300#/acre. I have some pi$$ poor soil in the swampy piney woods. In the past due to leaching have hit my corn, spuds, tomatoes and beans hard with the above rate as a final BOOST. For the boost I try to run 1.50# / 100 ft of row length. Rows are set at 3 ft. and 4 ft. 1.50# x 600ft = 900#. I hope to get this operation up to 100 rows. I am by now means the expert here, most of my neighbors are running more N than I. This is all I can afford.

Had not thought about the lack of leaching due to no rain, just got in a rut and was thinking with long weekend get some of this work done as it is "that time" based on plant growth.

Bulldog is water soluble. I have no irrigation in this field and to get water I use the ATV rig. I sold my old 6 ft. disk that carried my 55 gal. drum for watering. Had a spigot on the bottom with a long hose. You got me thinking and maybe I just need to water in the granular already in the field. Thanks for pointing that out.

Pic is from 2 wks. ago.

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Hal

05-30-2004 05:56:16




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 Re: Re: Re: Liquid fertilizer rates - need some he in reply to ShepFL, 05-29-2004 23:07:32  
Did your supplier have anything that was straight nitrate nitrogen, like Bulldog nitrate of soda (sodium nitrate) or possibly calcium nitrate? If he did, then you could have gotten half a ton of each and mixed it 50/50. That would get you closer to what you used in the past; you would end up with like approximately 15-0-23. Actually if you mixed it 2 to 1 you would end up with almost the identical ratio as the 20-0-20, except it would be 15-0-15, so you would have to use a little higher rate.

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ShepFL

05-30-2004 12:48:16




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 Re: Re: Re: Re: Liquid fertilizer rates - need som in reply to Hal, 05-30-2004 05:56:16  
Did not think to ask and supplier did not volunteer the info. I will check on Tuesday.
Thanks



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paul

05-30-2004 08:32:03




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 Re: Re: Re: Re: Liquid fertilizer rates - need som in reply to Hal, 05-30-2004 05:56:16  
Yes, I would have blended what I needed to make the proper fert rate that I needed.

--->Paul



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ShepFL

05-30-2004 12:49:53




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 Re: Re: Re: Re: Re: Liquid fertilizer rates - need in reply to paul, 05-30-2004 08:32:03  
Lessons learned I guess - Next time I will think to ask; supplier didn't volunteer the info. I plan to follow up Tuesday.
Thanks



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Bob

05-29-2004 17:47:14




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 Re: Liquid fertilizer rates - need some help in reply to ShepFL, 05-29-2004 16:43:09  
What rate are you trying to keep the same, the nitrogen, or the potash?

Are you buying the fertilizer in liquid form, or mixing dry fertilizer with water?



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ShepFL

05-29-2004 18:49:57




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 Re: Re: Liquid fertilizer rates - need some help in reply to Bob, 05-29-2004 17:47:14  
Howdy Bob -
Trying to keep the potash nearly the same. I don't want it to get to high and cause the plants to leap out of the ground or outgrow what little moisture I have.

Anywhoo, it is dry fertilizer to be mixed with water. I got one ton of this Bulldog fertilizer sitting and not quite sure what I got myself into :) Thinking that I need to pre-water and then follow up with the fertilizer. I am concerned that if I feed first then water I may push the feed past the root zone.

I am wanting to give my plants a final "boost" (ear fill) before harvest time near the end of June. It has been a DRY, DRY growing season here in N. FL. Dry weather has forced me into other alternatives that are stretching my experience and knowledge base. (still learning while chuggin in the weeds)

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Bob

05-29-2004 19:07:09




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 Re: Re: Re: Liquid fertilizer rates - need some he in reply to ShepFL, 05-29-2004 18:49:57  
You realize your original fertilizer is 20% "K" by weight, and your substitute is 46%, right?

So adjust your rate accordingly.

Your 36 lb rate x 20% "K" is 7.2 lbs actual "K" per 600' row.

One pound of your new fertilizer is .46 lb "K", so dividing the required 7.2 lbs actual "K" by .46, you find that you need 16.65 lbs of the new fertilizer per 600 feet of row to equal your old rate.

Old fertilizer = 36 lbs x 20% "N" = 7.2 lbs actual "N" per 600 feet of row.

New fertilizer = 16.65 lbs x 14% "N" = 2.33 lbs actual "N" per 600 feet of row.

Boy, I hope I did that right. And please feel free to shift some of the rain that has fallen on us in northern ND in the last month your way!

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ShepFL

05-29-2004 23:09:51




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 Re: Re: Re: Re: Liquid fertilizer rates - need som in reply to Bob, 05-29-2004 19:07:09  
Thanks a millon Bob. That is what I was trying to wrap my mind around tonight. I have copied this entire post for future reference.

Y'all have a GREAT WX. Back to chuggin in the weeds. . .



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steveormary

05-29-2004 20:43:48




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 Re: Re: Re: Re: Liquid fertilizer rates - need som in reply to Bob, 05-29-2004 19:07:09  
Shep Fl

Can your fertalizer supplier figure it for you?

steve



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