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adding nitrogen, potash, and making soil more acidic. #869304

Asked May 20, 2024, 3:26 PM EDT

I got my soil tested, and it needs nitrogen, and for the ph to be more acidic (like at a 6 I was thinking. It's at 7.5), and it needs some potash too. Would it work to spread bloodmeal or manure and also Espoma soil acidifier on it and till it in, and then to plant a cover crop like buckwheat on it? (I was thinking of not planting anything in it this year and to just focus on getting the soil healthy.) Or is that doing to much at once? Thanks!

Scott County Minnesota

Expert Response

Thanks for the question.  You may or may not have a problem.  pH 7.5 is not considered high.  No sense in going to a lot of effort if it is not necessary.

Please get back to me as to what you intend to plant in this area?

Many thanks.  Thanks for consulting us.

An Ask Extension Expert Replied May 20, 2024, 6:59 PM EDT
I want to plant rhubarb, tomatoes, cucumbers,  peppers, and other vegetables.  I read online that those plants do better in 5.5-6.5 ph soil. Is that true?

Thanks!




On Mon, May 20, 2024 at 5:59 PM, Ask Extension
The Question Asker Replied May 20, 2024, 10:28 PM EDT

Thanks for getting back to us.

I don’t think that it would be worth your time and effort to try and lower the pH of the soil. It is neither an easy nor quick process. Look at the following sites and you will see with a soil pH of 7.5, you should be able to grow the vegetables you mentioned:

https://www.bacfertilizers.com/mineral-fertilizer/soil-additives/ph-level-for-vegetables

https://www.gardenersnet.com/atoz/phlevel1.htm

I would be glad to provide you a more complete analysis of your soil if you wish. Just send us a pic of the first page of your soil report.

Good luck. Thanks for consulting us.

An Ask Extension Expert Replied May 21, 2024, 1:10 AM EDT
Ok, thank you. I have attached my soil sample



On Tuesday, May 21, 2024 at 12:10:06 AM CDT, Ask Extension <<personal data hidden>> wrote:


The Question Asker Replied May 21, 2024, 11:46 AM EDT

Thanks for your soil report.  I've printed it off and will look at it today.  Will try to get back to you later today.  Thanks for consulting us. 

An Ask Extension Expert Replied May 25, 2024, 8:51 AM EDT

Thanks for providing us with a copy of your soil report.

Our thoughts are as follows:

1). Your soil texture of “medium” indicates a soil that should be good for growing the vegetables you mentioned in your initial question.

2). The organic matter content of 6.7% probably contributes to the very high phosphorous in the soil. I suspect that you probably have added various types of compost to your garden over the years. Sometimes one can add too much compost. For the 2024 season, I would suggest no addition of compost. This will tend to reduce the soil phosphate. For sure, do NOT add any manure. See:

https://extension.oregonstate.edu/catalog/pub/em-9308-how-use-compost-gardens-landscapes - :~:text=If too much compost is,growth and low-oxygen water.

https://extension.umn.edu/nutrient-management-specialty-crops/correct-too-much-compost-and-manure

3). There is a recommendation of adding 0.15 pounds of nitrogen/100 sq ft. As you mentioned in your initial question, blood meal could be used to satisfy this. It can be obtained at most garden centers. Looking at the container label, typically it will indicate that it contains 12% nitrogen by weight. This means that in every pound of blood meal there is 0.12 pounds of nitrogen. To meet the nitrogen recommendation in the soil report, add 1.25 pounds of blood meal per 100 square feet of garden.

4). The potash recommendation of 0.3 pounds per 100 square feet could best be met by using muriate of potash. It is also available at garden centers. The label on the container usually states 0-0-60. This means that 1 pound of muriate of potash contains 0.6 pounds of potash. To meet the potash recommendation in the soil report, add 0.5 pounds of muriate of potash per 100 square feet of garden.

Good luck. If you have any further questions, please let us know. Thanks for using our forum.

An Ask Extension Expert Replied May 26, 2024, 11:05 PM EDT
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An Ask Extension Expert Replied May 26, 2024, 11:09 PM EDT

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