Best Fertilizers For Potatoes 2022: Reviews & Buyer’s Guide

1. Worm Castings 2. Miracle Gro 3. Dr. Earth
Worm Castings Best Fertilizer For Potatoes Miracle Gro Dr. Earth Fertilizer

Organic and mineral fertilizers are combined for gardening for in the production of potatoes. Out of the organic, the best results are given by decomposed manure, which contains almost all the necessary macro- and microelements for the plant.

The best fertilizer for potatoes though are nitrogen, phosphorus, and potassium fertilizers, and they are imported once per year in the autumn or early spring.

Potassium chloride is not recommended for potatoes, though potassium sulfate is appropriate. Nitrogen fertilizers are given once or twice. If the farmer plans to take out the potatoes in May, all the nitrogen should be imported to planting.


If the potatoes are harvested in the second half of June, it would be more effective to bring 2/3 of the norm of nitrogen fertilizers to planting and 1/3 – with the first digging.

Mineral Fertilization Of Potatoes

Potatoes respond extremely well to a higher acrophone and, consequently, richer fertilization. It must be tailored to the optimum crop requirement for the soil, area, growing conditions, and requirement of the variety selected.

It is extremely important to make balanced fertilization with nitrogen, phosphorus, and potassium fertilizers based on laboratory analysis. One-sided fertilization with one type of fertilizer – and most often with nitrogen (even with manure only) is not effective, and does not provide high yields.

This way production is not of very good quality. Very often there are the following side effects of unilateral nitrogen fertilization.

  • prolongation of vegetation
  • formation of fewer tubers
  • susceptibility to mana and other diseases
  • tubers are more susceptible to injury, with the less dry matter, more nitrates, and other negative reflections

This is why manufacturers created the best fertilizers for potatoes. They combined the optimum amounts and norms of the substances useful for potatoes.

1. Nitrogen

Nitrogen has a strong effect on plant growth. It stimulates the development of the stems and leaves of the potatoes and thus increases the production potential of the crop. However, too much nitrogen slows down tuber formation and harms yields. Therefore, a well-balanced amount of nitrogen in the best fertilizers for potatoes is a very important factor.

The amount of nitrogen required for potato crops depends on the climate conditions, soil fertility, the amount of manure imported so far, as well as the type of crop. The manufacturers of the best fertilizers for potatoes take these factors into account.

2. Phosphorus

Phosphorus contributes to the timely development of crops and increases the number of tubers per plant, which means higher yields. This is also why phosphorus is inevitably present in the best fertilizers for potatoes.

With mild or moderate phosphorus deficiency, potato plants usually do not exhibit specific symptoms of the foliage. The only symptoms that can be seen are the dark, matt green color of the leaves. The plants are also a little smaller than usual.

3. Potassium

Potatoes need a relatively large amount of potassium. This element affects some of the qualities of the output produced, for example, it improves storage. Potassium reduces the susceptibility of potato to black spots by reducing the dry matter in the tuber.

For soil poor in potassium, 300 to 500 kg K20 per hectare is required. Potassium is usually introduced in the form of potassium sulfate: K2SO4. Potassium is more readily soluble in water than phosphorus and is more likely to wash away from the soil.

To prevent this risk, some of the best fertilizers for potatoes are introduced during planting and the other after germination, as indicated in the instructions to them.

4. Magnesium

Magnesium deficiency problems are most common in sandy and peat soils with low pH and magnesium content.

In coastal clay soils, magnesium deficiency occurs mainly when potatoes are grown on slightly calcareous soils, due to their low magnesium content and/or poor magnesium digestibility.

An overdose of potassium exacerbates the symptoms of magnesium deficiency. It also inhibits the ability of plants to absorb magnesium. Therefore, the correct ratio of magnesium to potassium is a mandatory feature of the best fertilizers for potatoes.

The same is true of nitrogen. The less nitrogen available, the earlier the plant shows symptoms of magnesium deficiency.

5. Manganese

Manganese deficiency occurs in potato crops in sandy soils with a pH above 5.5 and in calcareous/sandy/clay soils. Prolonged drought and high temperatures contribute to the appearance of symptoms of manganese deficiency, which in some types of soil is corrected by rain.

Usually, the youngest leaves of the plant show the first symptoms of manganese deficiency. They turn pale, turn inward and hang. In a few days, rows of numerous black dots appear, mainly around the veins.

The benefit of introducing manganese fertilizers into the soil is small, as symptoms usually occur due to less absorption of manganese from the plant, than due to low absolute values ​​of manganese in the soil.

The acidity level of soils with high pH is difficult to reduce rapidly, so foliar fertilization with Mn is often the only feasible measure. Fortunately, there are a variety of foliar fertilizers among the best fertilizers for potatoes.

6. Boron

Boron is an essential ingredient in the best fertilizers for potatoes. It is needed in larger quantities to provide several key growth processes. Boron is also important for the absorption of calcium.

Together with potassium, calcium, and magnesium, boron is an important element present in the cell wall. Boron plays the role of cement, which binds pectins and ensures the strength of cellular tissues, therefore affecting the stability of potato storage.

In the absence of boron, the stems of the potatoes are short and as a result of the lateral branching from the lateral buds, potato plants have a bushy appearance. The youngest leaves become chlorotic, develop necrotic spots, and dry.

Concentric spots appear in the tubers and the conduction bundle rings darken. The tuber skin becomes rough and cracked with necrotizing meat below.

Organic Fertilization Of Potatoes

The results from the use of organic fertilizers, both manure, and green, are equally good. Both species gradually release minerals (such as N, P, and K) and improve soil structure.

It is very important that manure is well decomposed before application and that green fertilizers are not plowed too deep so that they can decompose sufficiently.

Particularly where the organic matter content of the soil is low (in dry and semi-arid regions), it is advisable to apply manure or green manure before planting. The problem is whether there is such availability. It is recommended that organic fertilizers be supplemented with the best fertilizers for potatoes.

How To Choose The Best Fertilizer For Potatoes?

Many gardeners fertilize the potato levels with manure, but still, fail to provide the potatoes with all the nutrients they need. When a fertilizer is freshly introduced, soil organisms absorb nitrogen and thus deprive potatoes of food.

The manure nutrients reach the potatoes only in the second half of the summer when the development of the potato plants is almost complete.

To balance nutrition, not only organic but also mineral fertilizers, especially rich in potassium, need to be introduced when planting potatoes. A good harvest can be obtained by applying compound fertilizers, along with wood ash.

Whatever the disadvantages of the soil, they can be overcome by choosing the best fertilizers for potatoes. But what do we pay attention to, to make sure our choice is right?

Stages Of Potato Development

Immediately after the germination of the leaves, the shoots are formed in the terrestrial part of the plant, along with the roots in the soil.

At this stage, the main goal is to form a rich and healthy root system that will feed the tubers. At this stage, the best fertilizer for potatoes is the one high in nitrogen, phosphorus, and potassium.

When the first tubers appear, the nutrients formed by photosynthesis pass into the roots and tubers of the potatoes. Now is the time to stop fertilizing with nitrogen, as it will slow down the growth of tubers.

Emphasize phosphorus, as it is the major nutrient responsible for potato size. Potassium and magnesium are added to increase the photosynthesis of the leaves and participate in the transfer to the root system.

At the stage of the final formation of tubers, re-incorporate nitrogen into your requirements for the best fertilizer for potatoes.

It will increase protein production and extend the life of the leaves, which are now the main nutrient source of tubers. Phosphorus is responsible for the final size of the potato.

Determination Of Fertilizer Standards

Fertilizer norms are determined in the same way as other crops, taking into account many factors – soil fertility, precursor, water regime, planned production. Nitrogen fertilizers are imported by sowing.

With well-balanced basic fertilization, foliar feeding with suitable fertilizers in the pre-flowering, flowering, and after flowering phases also have good results.

With intensive technology, fertilizer rates can reach 25-30 kg. nitrogen, 20-25 kg. phosphorus and 25-28 kg. potassium per acre.

It has been found that at a higher dose of nitrogen (over 12 kg/ha) in poor phosphorus and potassium soils the ratio of nitrogen (N), phosphorus (P) and potassium (K) should be 1: 1.5: 1, 5.


Complex fertilizers are undoubtedly among the best fertilizers for potatoes. They contain two, three or more nutrients in one pellet. They are universal water-soluble fertilizers that bring the necessary nutrients into the soil.

They also ensure more even absorption of nutrients by plants. NPK fertilizers also have a more favorable effect on the microbiological activity of the soil. They ensure less money and labor investment.

Ammonium nitrate and ammonium sulfate are used in the production of the best fertilizers for potatoes, where 6% S is imported and neutralizes the action of chlorine ion, and serves as an additional nutrient. These fertilizers are applied pre-sowing or with basic preparation of the soil.

The composition of the best fertilizers for potatoes is enriched with minerals such as potassium, copper, zinc, nitrogen, and phosphorus.

They are presented in a compact form, therefore, optimal for transportation. They are used depending on the type of soil. As the market for mineral fertilizers is huge to facilitate you, we have selected the best fertilizers for potatoes.

Top 10 Best Fertilizers For Potatoes 2022

1. Worm Castings

Worm Castings Best Fertilizer For PotatoesWorm Organic contains the most important nutritional components of organic fertilizer – humic acids, fulvic acids, and all the micro and macronutrients that are necessary for the plant. It acts both as a nutrient source and as a plant growth stimulant.

Since the fertilizer is made of worms, it is also a soil improver for humus-poor soils. At the same time, it stimulates the beneficial soil microflora, thus enhancing the general condition of the soil and transmitting the soil elements in a form accessible to the plants.

Plus it’s completely organic and chemical-free. So you can be sure that the potatoes you produce will be completely natural.

To put Worm organic among the best fertilizers for potatoes, we also took in mind that it helps in forming a strong root system. This increases the plant’s susceptibility to stems and pathogens. This is an excellent choice for the production of ecologically pure production.


  • Fully natural, free of toxins
  • No scent
  • Presence of all micro and macro elements useful for potatoes
  • It can be used at any stage of potatoes` development


  • Helps to develop more weeds

2. Miracle Gro

Miracle GroThis fertilizer is made for all kinds of crops, including potatoes. It has a particularly useful composition. It includes phosphorus, potassium, nitrogen, magnesium, bioavailable silicon, boron, titanium, manganese, and molybdenum.

The supplement actively reduces the amount of nitrate in the fetus. Miracle-Gro can be used at all stages of sowing and development. As long as you follow the directions of the package correctly, fertilize your potatoes with it even before flowering at 1.5-2 weeks intervals, this fertilizer will not damage or burn them.

At the same time, just as required by the best fertilizers for potatoes, Miracle-Gro improves soil structure, reduces nitrate content, and accelerates plant growth. It also improves germination, protects potatoes from negative effects, and enhances freshness.

The complex formula is optimally selected and is highly efficient. Many components are required for the full development of the potatoes, and this fertilizer has them. The shape of the package is so designed that you only need to attach it to the hose and fertilize while watering.


  • Rich in elements needed for the potatoes
  • Excellent performance
  • Economical
  • Very good feedback from customers


  • It is not specifically produced for potatoes

3. Dr. Earth Fertilizer

Dr. Earth FertilizerWhen a fertilizer contains as many organic ingredients as this one does, it is a must to be among the best fertilizers for potatoes. Dr. Earth is a natural fish-based plant-based food for potatoes during the planting and development phase. It promotes rapid growth, green leaves, and high resistance. It is also rich in nitrogen, amino acids, and vitamins.

Due to the organic matter content, this fertilizer cannot be overdosed and burn the plants. This will allow you to start treatment in the first few weeks after germination. At the same time, it is extremely cheap to use.

Thanks to its composition, Dr. Earth enhances growth and increases plant immunity against disease and stress. It keeps the plant vibrant and fresh, thus better prepared for flowering. At the same time, the fertilizer is environmentally friendly and harmless to young plants. And, it can be used on all types of substrates and soils.


  • Economical
  • Effective
  • Ecologically clean
  • It can be used in all stages of potato development


  • Attracts gnats

4. Dynamite Complete

Dynamite CompleteDynamite Liquid Fertilizer is a growth stimulant and enhancer for all kinds of flowers and vegetables – including potatoes. The usefulness of the product is mainly due to the content of all the necessary macro and microelements in a directly digestible form.

The effect of the fertilizer is due to the rich content of natural growth regulators, as well as the high content of protein, which is rapidly involved in metabolism. More importantly, the nutrients continue to be released for a full 9 months.

That way, your potatoes will be fertilized throughout the season, even longer. It certainly deserves a place among the best fertilizers for potatoes.

Through its beneficial ingredients, dynamite stimulates cell division and promotes root formation and growth. It reduces frost damage, improves the oil content of potatoes and increases yields.


  • 9-month nutrition period
  • Optimal composition
  • Increases yields
  • Easily digestible form


  • High price

5. Urea Fertilizer

Urea FertilizerWhen it comes to the best fertilizers for potatoes, the nitrogen content is of utmost importance. Urea Fertilizer is a nitrogen fertilizer that has this active substance – precisely 46%.

The chemical formula of this fertilizer is similar in composition to the organic formulation of urea. This gives it several advantages in its mass use to nourish crops.

The interaction of the fertilizer with the soil medium so that it reaches the most accessible form to the plants is another advantage. After Urea enters the soil, it is subject to dissolution from soil moisture to produce nitrate anion (NO3-), which is easily fed to plants.

Another part of the product enters the microorganisms and nourishes their metabolic processes. After the death of these microorganisms, these organisms become a nutrient form of nitrogen too.

An additional plus here is the low cost and ease of use. This fertilizer is readily soluble in water if needed. It does not contain any toxins, which is also important for growing potatoes.


  • High nitrogen content
  • Soluble in water
  • Easy to use
  • Non-toxic


  • Contains no potassium and magnesium

6. Single Jar Makes Fertilizer

Single Jar Makes FertilizerThe best fertilizers for potatoes should supply the plant with optimal amounts of nutrients throughout its development process. Singe Jar does this in the most efficient way possible, without damaging the soil and groundwater.

The balanced content of nutrients ensures a consistent, effective release of the required amounts of nutrients. They fully meet the needs of the potatoes at every stage of their development.

This NPK fertilizer will offer you a controlled release of nutrients and a significant increase in the nutrient utilization rate. This will reduce nutrient wastage losses.

At the same time, keep in mind that the controlled release of relatively low quantities from an element, which is difficult to achieve with separate fertilization, will only benefit your crops.

The use of Single Jar will ensure the maximum efficiency of your crops as well as a complete and balanced supply of nutrients for your potatoes.


  • High and well-balanced concentrations of nitrogen, phosphorus, and potassium
  • Soluble in water and easy to bring into the soil
  • Free shipping
  • Highly effective


  • The release of nutrients requires a long time

7. Miracle Gro For Indoor Gardening

Miracle Gro For Indoor GardeningFertilizers for indoor plants provide the basic nutrients of nitrogen, potassium, and phosphorus. These nutrients must be present in sufficient quantities in each best fertilizer for potatoes for them to grow well.

Miracle-Gro is a well-known home garden brand that is used both for indoor and outdoor plants. This fertilizer is specifically designed for growing plants in water-based recycling systems.

It is sometimes difficult to estimate how much fertilizer to put in the hydroponics system. Well, with Garden-Pro, this problem does not exist.

The package you will receive contains 12 doses, each of which is intended for 1-time use. No need to measure or hesitate – just tear the pack and add its contents to the water in the system.

Garden-Pro will soon accelerate growth and improve your plant structure, refreshing and energizing it. It will balance the acidity of the pH of the medium and regulate the supply of nutrients. This will certainly make your harvest more than abundant.


  • Convenient packaging
  • Easy insertion into the hydroponic system
  • Contains all useful micro and macro elements
  • An established fertilizer manufacturer


  • Intended for use in hydroponic systems only

8. Lilly Miller Morcrop

Lilly Miller MorcropWith the perfect ratio of nitrogen, phosphorus, and potassium 5:10:10 Lilly Miller Morcrop quite naturally ranks among the best fertilizers for potatoes. The combination of three nutrients in one pellet ensures effective application.

It maintains cultivation where needed. This includes potatoes and other root crops. With its qualities, this fertilizer can meet even the highest requirements of any farmer.

Ammonium nitrogen cannot be washed out quickly and provides potatoes with vitality. It is intended to nourish the root system of the plants, improve soil fertility and increase yields.

The main advantage of Lilly Miller Morcrop is the prolonged effect of absorption of useful soil elements.

This fertilizer improves soil quality, improves its structure and increases yield. It strengthens the immune system of plants and prevents the spread of diseases.

Buyers note in their reviews that after its implementation, good results are noticeable – soil fertility improves and tubers grow better.


  • It nourishes both potatoes and soil
  • Proven efficiency
  • The ideal ratio of nitrogen, phosphorus, and potassium
  • Specifically designed for root crops


  • Can only be used for outdoor crops

9. Urban Farm Apples and Oranges Fertilizer

Urban Farm FertilizerWhen NPK fertilizer is combined with organic elements, it is undoubtedly one of the best fertilizers for potatoes.

Its organic components such as mycorrhizae, worm casts, humic acid, kelp, enzymes, and minerals will give your potatoes all the nutrients they need. No matter where they are grown – indoors, outdoors or in hydroponic systems.

One of the many benefits of Urban Farm is its immediate effect. This ensures rapid absorption of the plant supplement and has a beneficial effect on the soil. This fertilizer is one of the most effective, because it contains all the necessary elements for plant and soil nutrition. Such additives significantly increase fertility and yield.

And as for its price, it is extremely affordable. This is another factor that makes this fertilizer not only one of the best fertilizers for potatoes but also one of the most widely used by gardeners.


  • Organic mineral fertilizer
  • Proven efficiency
  • Increases fertility and yield
  • Low price


  • Designed primarily for citrus fruits

10. Urban Farm Vegetable Fertilizer

Urban Farm VegetableUrban Farm is one of the oldest and most established fertilizer producers on the market. This handmade fertilizer is specifically designed for vegetables. The rich calcium content helps to stop the decay at the end of flowering.

Calcium is a slightly mobile element and difficult to move in different parts of the plant. For this reason, it is necessary to continuously supply the easily absorbed calcium, which Urban Farm contains.

The effect of the fertilizer is direct and immediate. The elements in it persist for a long time and do not form indistinguishable compounds for the plant. On the contrary, they are present in the soil and the root layer. Thus, the plant organism uses them following its needs.

Urban Farm also supports the expansion of soil pores. This way, the circulation and the amount of soil air and water (moisture) can be significantly improved, especially in the case of heavy, irrigated soils.

The use of this fertilizer is also extremely suitable for acidic soils because of the elements it supplies – water-soluble calcium plus nitrogen in nitrate form.

They do not create additional acidity in the soil, as is the case with products with other nitrogen forms – ammonium and amide.


  • Hand-crafted
  • Rich in calcium
  • Useful to soil
  • Designed for all types of vegetables


  • The ratio of the elements is detrimental to phosphorus

FAQs on Fertilizers For Potatoes

1. What Is The Best Fertilizer For Growing Potatoes?

Among all garden plants, potato planting requires special care. Potatoes are often attacked by insects and need fertilization – as early as the planting stage. To prevent such situations and to obtain a good harvest, experts recommend the use of mineral organic fertilizers.

You can now find many different options offered by local and foreign manufacturers. The most useful ingredients in fertilizers are potassium, nitrogen, phosphorus, compost, and humus. To choose the best fertilizer for potatoes, check out for the presence of these elements.

2. What Fertilizer Is Needed For Potatoes?

From the organic fertilizers, the most well-fertilized manure and compost are the most suitable for the potatoes, while from the mineral fertilizers the complex fertilizers and the superphosphate are particularly favorable.

Organic fertilizers can be applied to a handful at each hole during planting or in late spring and early summer. Mineral fertilizers work best in combination with organic fertilizers – a bucket of burnt manure is added with a tablespoon of superphosphate.

It dissolves very slowly and provides nutrients to the plants for an extended period. But to make sure that the mineral fertilizers contain all the nutrients they need for potatoes, and in the right proportion, use only the best fertilizers for potatoes.

3. How Do You Increase The Yield Of Potatoes?

The potato planting site must be prepared in advance – every square meter of manure should be buried, with half a liter of wood ash and a spoonful of complex (combined) fertilizer. All this should be spread evenly over the surface and dug.

Potatoes should be planted where they have not been grown for at least 4 years. They grow best after cabbage, cucumbers, and root crops.

Potatoes are among the most beneficial vegetables for nourishment, and only in this way can the harvest be increased by 40-50%.

Usually, 50% of the recommended amount of superphosphate and potassium sulfate is recommended for planting, while the remaining half is used at the stage of flourishing.

It is done this way because then the tubers are formed and the fertilizers stimulate the increase in their number.

4. What Is The Best Organic Fertilizer For Potatoes?

Both organic and mineral substances are used for potato fertilization. Such fertilizers can be combined, but many prefer to limit themselves to purchasing complex mixtures.

The reason is that organic matter during decomposition is beneficial not only to plants but also to pests. With an abundance of organic fertilizers in the soil, they damage the tubers.

Note that many mineral fertilizers include organic substances. These fertilizers also contain much-needed nitrogen, phosphorus, potassium, and boron. So check out our list of the best fertilizers for potatoes and find the one you like best.

Best Fertilizers For Potatoes – Conclusion

Proper and balanced nutrition of the potatoes contributes to the good shape and size of the tubers. The nutrients nitrogen, phosphorus, potassium, calcium, magnesium, and manganese affect the size of tubers.

The right balance between macronutrients is important to achieve optimum potato growing results. A shortage of even one nutrient will reduce yield and quality.

So, be sure to use one of the best fertilizers for potatoes that contains all the nutrients you need for potatoes, in the right proportion.