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Luster Leaf 1601 Rapitest Test Kit for Soil pH, Nitrogen, Phosphorous and Potash, 1 Pack

4.2 4.2 out of 5 stars 8,656 ratings

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40 Tests
Soil Test Kit for pH, N, P and K
Kit

Purchase options and add-ons

Brand Luster Leaf
Product Dimensions 2"W x 9"H
Item Weight 4 ounces

About this item

  • Quick, at home results for Soil pH, Nitrogen, Phosphrous and Potash
  • Innovative and inexpensive soil test kit features an easy-to-use capsule system and patented color comparators
  • Contains all components needed for 40 tests. 10 for each of pH, N, P and K
  • Simple, detailed instructions included. Great for beginners and experienced gardeners alike.
  • Soil pH preference list for over 450 plants included

Customer ratings by feature

Easy to read
3.6 3.6
Easy to use
3.6 3.6
Accuracy
3.3 3.3
Value for money
3.1 3.1

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From the manufacturer

Soil Testing

Why Test Your Soil?

Plants need food (nutrients) for healthy growth. Nitrogen, Phosphorus and Potash (N, P and K), play a vital role in plant growth just as vitamins, minerals, carbohydrates and protein do in our health.

How to Test Your Soil

For gardeners already familiar with soil testing, you'll appreciate the unique, patented, specially designed "color comparator" and capsule system, that make quick work of testing. For those of you new to soil testing, you will appreciate this easy, fast and fun way to achieve better growing results from your gardening efforts!

Everything is color-coded, including the color comparator films and capsules. All you do is take a sample of soil, mix with water, transfer some of the solution to the color comparator, add powder from capsule, shake and watch the color develop. Then, note your test results. Fast, easy and it only takes a few minutes!

When To Test Your Soil

Soil should be tested periodically throughout the growing season, but it is especially recommended to test before planting in the Spring and when preparing beds in Fall.

Included in the Kit:

  • 4 Color Comparators
  • Eye dropper for easy solution transfer
  • 40 test capsules - 10 for each of pH, N, P, K
  • Complete instructions and Fertilization guidelines
  • pH preference list for over 450 plants

Soil Elements

N - Nitrogen

Nitrogen is synonymous with plant nutrition. It is directly responsible for producing leaf growth and green leaves. A deficiency causes yellow leaves and stunted growth. Too much nitrogen causes overabundant foliage with delayed flowering; the plant becomes subject to disease and its fruit is of poor quality.

P - Phosphorus

Growing plants need phosphorus. It is the major constituent of plant genetics and seed development. A deficiency causes stunted growth and seed sterility. Phosphorus aids plant maturity, increases the seed yield, increases fruit development, increases vitamin content and aids the plant's resistance to disease and winterkill.

K - Potash

Potash strengthens the plant. It helps form carbohydrates and promotes protein synthesis. It will improve the color and flavor of fruit. It further aids early growth, stem strength and cold hardiness. Plants deficient in potash are usually stunted and have poorly developed root systems. Leaves are spotted, curled and appear dried out at the edges. Yields for potash deficiency are low.

pH - Acidity / Alkalinity

Plants also need the correct pH level which controls how well plants utilize the nutrients available in your soil. All plants have a pH preference, so it is important to know the pH level of your soil. You can then choose plants with the same pH preference, avoid those that will not do well in your soil or know how to go about supplying their special growing needs. By testing your soil, you determine its exact condition so that you can fertilize and/or adjust pH more accurately, effectively, and economically.

Product information

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Luster Leaf 1601 Rapitest Test Kit for Soil pH, Nitrogen, Phosphorous and Potash, 1 Pack


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Product guides and documents

Looking for specific info?

Product Description

It’s vital to know the existing pH, Nitrogen (N), Phosphorous (P) and Potash (K) levels in garden soil. The rapitest Soil Test Kit continues to be the standard for home soil testing. The kit includes all components needed to for (40) tests: (10) each for pH, Nitrogen, Phosphorus and Potash. The patented color comparator system allows for easy color comparisons versus a typical printed color chart. Extensive, yet simple, instructions are included along with recommendations for over 400 plants. Test results allow the gardener the amend and fertilize appropriately, ensuring the best possible results

Customer reviews

4.2 out of 5 stars
4.2 out of 5
8,656 global ratings

Customers say

Customers are happy with value, and ease of use of the product. They mention that it's easy to set up and use. However, some customers have reported issues with the ph reading, saying that their soil was extremely deficient in nitrogen. They also dislike the color, and opinions are mixed on quality, readability, speed, and accuracy.

AI-generated from the text of customer reviews

469 customers mention352 positive117 negative

Customers find the soil tester kit easy to use. They say the instructions are straightforward and the testing process is fairly straightforward. Customers also say the guide is detailed and efficient.

"...It’s a practical, user-friendly tool that delivers reliable results, and it’s definitely a worthwhile investment for anyone serious about gardening." Read more

"...The guide is very detailed and efficient and after readings it twice or thrice the process is very simple and the results are quite clear..." Read more

"Fun kit. Many steps but the instructions are very straightforward. Annoyingly, the kit is one potash (orange) capsule short." Read more

"...All of this requires a bit of critical thinking, and if you don't like this kind of stuff you will be frustrated and unsure...." Read more

144 customers mention111 positive33 negative

Customers find the value of the book to be inexpensive and easy to read. They also say it's a worthwhile investment for anyone serious about gardening.

"...tool that delivers reliable results, and it’s definitely a worthwhile investment for anyone serious about gardening." Read more

"...The tests are fairly straight forward, easy to use, and inexpensive. I took off one star because of a few frustrations I had with the kit...." Read more

"...I'm just going with multi-indicator pH paper. It's cheap and easy to read." Read more

"...At 30 seconds, it's at the opposite extreme. And npk all show as surplus, when checking Bergers potting mix that is supposed to be nutrient free...." Read more

652 customers mention431 positive221 negative

Customers are mixed about the quality of the product. Some mention that the results are basic, but gives them a better idea of what soil type they're working with. They say that it works well for determining what amendments to add to the soil and is useful for follow up after adding nutrients. However, others say that the product has a very limited amount of tests, which is not good if you want to monitor a specific soil. Some customers also say that some test results were ambiguous and inconclusive.

"...this soil testing kit from Amazon, and I’m thoroughly impressed with its performance and ease of use. The kit arrived promptly and was well-packaged...." Read more

"...All in all, if the results are indeed accurate, I think the kit is very good, but what I particularly miss is the option to purchase supplemental..." Read more

"...Uninteresting. Incomprehensible...." Read more

"This item worked great. Really helped me to figure out what my garden soil needed. Prepping my soul now based off the results from this test kit...." Read more

179 customers mention79 positive100 negative

Customers are mixed about the accuracy of the product. Some mention that it was very accurate and gave them great insight as to why their yard. However, others say that the concentrations and results are questionable, difficult to discern, and require a bit of interpretation.

"The results are questionable. Support so far is non existent. Ph readings at 15 seconds is at one extreme...." Read more

"...and potassium were simple to perform and provided quick, accurate results...." Read more

"...The results you get will not be numerical...." Read more

"...it twice or thrice the process is very simple and the results are quite clear..." Read more

65 customers mention30 positive35 negative

Customers are mixed about the readability of the product. Some mention it's easy to use, read the indicators, and get a good reading, while others say that it'd be difficult to read the results with red clay and some black garden soil. They also mention that the shading is a little difficult to see, and the instructions are simple to understand.

"...while developing in the allotted time, are not very strong and difficult to read...." Read more

"...Repeatable results and easy to read data.The price drops a bit more on the bigger packs...." Read more

"...a test with food color and the green is indeed high ph, and orange read as extremely low...." Read more

"...reaction has taken place inside the test chamber, it is fairly easy to read. In my case, my suspicions regarding poor nitrogen were confirmed...." Read more

59 customers mention34 positive25 negative

Customers are mixed about the speed of the product. Some mention that they like the quickness of the results and the color coordinated usage, while others say that the Rapid part of Rapidtest is misleading. They mention that the tests are not very rapid or convenient to do, and that it takes a while to prepare each sample.

"...pH, nitrogen, phosphorus, and potassium were simple to perform and provided quick, accurate results...." Read more

"...It is not an instant process as you are required to stir your soil sample with water and allow it to settle before mixing a test capsule with the..." Read more

"...The tests can be done quickly, but it takes about a day to get the soil ready for the test...." Read more

"...The main complaint seem to be to difficulty in extracting the testing powder from the capsules...." Read more

89 customers mention20 positive69 negative

Customers find the color of the product to be difficult to determine. They mention that the color shades are very similar to each other, making it hard to interpret the results. Some customers also mention that it didn't change the water color at all.

"...My pH color did not match exactly any of the 5 shades. I guess it was close to 6.5 but I definitely am not 100% certain...." Read more

"...Anything. What I got instead was a test mixture clearer and with less color than not only the lowest reading the tester allowed for but also less..." Read more

"...We had very minimal if any color change and so it made the exercise actually worthless...." Read more

"This kit uses color-coding to be sure you put the right things in the right place. The instructions are clear...." Read more

89 customers mention25 positive64 negative

Customers are dissatisfied with the ph reading. They mention that the soil is extremely deficient in nitrogen, phosphorous, and potassium. They also say the test ran low and the contents of the nitrogen testing capsules degraded.

"...of Nitrogen (which turned out to be correct), but Deficient in Potassium and Phosphorus...." Read more

"...some of the nitrogen capsules had no effect... even when i added nitrogen to the sample. clearly there are problems here...." Read more

"...The tests for pH, nitrogen, phosphorus, and potassium were simple to perform and provided quick, accurate results...." Read more

"...A flaw we found was that the pH test doesn't go high enough. We found out that our sample was alkaline, but the scale only goes to 7.5...." Read more

Worked perfectly for testing different soils.
5 Stars
Worked perfectly for testing different soils.
We were able to test multiple spots on our land and it was so easy to use. Highly recommended.
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Top reviews from the United States

Reviewed in the United States on January 22, 2024
Size: 20 TestsStyle: Soil Test KitPattern Name: KitVerified Purchase
8 people found this helpful
Report
Reviewed in the United States on March 6, 2024
Size: 40 TestsStyle: Soil Test Kit for pH, N, P and KPattern Name: KitVerified Purchase
Reviewed in the United States on March 17, 2024
Size: 20 TestsStyle: Soil Test KitPattern Name: KitVerified Purchase
Reviewed in the United States on March 6, 2024
Size: 25 TestsStyle: Digital Soil Test KitPattern Name: KitVerified Purchase
Customer image
3.0 out of 5 stars Missing capsule
Reviewed in the United States on March 6, 2024
Fun kit. Many steps but the instructions are very straightforward. Annoyingly, the kit is one potash (orange) capsule short.
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Reviewed in the United States on May 18, 2019
Size: 40 TestsStyle: Soil Test Kit for pH, N, P and KPattern Name: KitVerified Purchase
6 people found this helpful
Report
Reviewed in the United States on February 20, 2024
Size: 20 TestsStyle: Soil Test KitPattern Name: KitVerified Purchase
Customer image
5.0 out of 5 stars Worked perfectly for testing different soils.
Reviewed in the United States on February 20, 2024
We were able to test multiple spots on our land and it was so easy to use. Highly recommended.
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Top reviews from other countries

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globalhot
5.0 out of 5 stars Test de sol de Jardin
Reviewed in Canada on November 9, 2023
Size: 25 TestsStyle: Digital Soil Test KitPattern Name: KitVerified Purchase
Brian K
5.0 out of 5 stars Easy to use with good instructions
Reviewed in Canada on May 8, 2023
Size: 20 TestsStyle: Soil Test KitPattern Name: KitVerified Purchase
One person found this helpful
Report
hg
4.0 out of 5 stars Sehr einfacher test
Reviewed in Germany on February 24, 2024
Size: 20 TestsStyle: Soil Test KitPattern Name: KitVerified Purchase
Fantasyreader
5.0 out of 5 stars Useful guide
Reviewed in the United Kingdom on June 7, 2023
Size: 40 TestsStyle: Soil Test Kit for pH, N, P and KPattern Name: KitVerified Purchase
ROHITGANGADEB
5.0 out of 5 stars Rapitest Soil testing
Reviewed in India on August 15, 2021
Size: 40 TestsStyle: Soil Test Kit for pH, N, P and KPattern Name: KitVerified Purchase
One person found this helpful
Report