What fertilizers to apply in the fall after harvesting potatoes

At first glance, potatoes seem easy to clean. In fact, this is a very capricious culture with serious requirements for soil quality. To satisfy all the whims of the plant, you will have to take care of the fertility of the soil in advance - literally immediately after harvesting.

We will tell you in detail about what fertilizers to apply in the fall for digging for potatoes.

Why is it so important to fertilize the land for potatoes in the fall

Fertilize the soil immediately after harvesting you need to restore its fertility, because the formation of green mass and tubers takes a lot of nutrients.

During the autumn-winter period, organic matter has time to overheat, and mineral fertilizers partially decompose, forming easily assimilated compounds. This is the right time to disinfect the soil and normalize its acid-base balance. Less fertilizers are required in the land prepared in the fall, and their effect will be stronger.

Soil preparation

Potatoes are picky about soil fertility and love a thick layer of humus. To ensure such conditions, organic trenches begin to be prepared in the fall. This method allows you to get the maximum yield even in small areas, since the roots of the plants receive natural warmth, drainage and fertilization.

How to prepare organic potato trenches

Dig grooves 35-40 cm in depth and width. A passage of 60-80 cm is left between the trenches.

Organic waste is placed at the bottom of each groove: flower stalks, weeds, mown grass, pumpkin tops, fallen leaves. Sprinkle with earth on top. To accelerate decomposition and enrich the soil with beneficial bacteria, microbiological preparations are used - "Shining", "Vostok", "Baikal".

In a few months, organic matter has time to ferment, and the soil becomes looser and more nutritious.

Autumn feeding rules

Autumn soil preparation for planting potatoes includes:

• cleaning the site from tops and weeds;
• leveling the soil;
• sowing green manure;
• digging up the soil;
• application of organic and mineral fertilizers.

Soil preparation

To begin with, the area is cleaned of tops. The green mass of nightshades (potatoes, tomatoes, peppers and eggplants) is burned, the tops of cucumbers and zucchini can be sent to a compost pit, after having been watered with a lime solution - 1 kg of substance per 10 liters of water.

Weed residues are potentially dangerous for the future harvest. In addition to shading the area and consuming nutrients from the soil, weeds attract pests (wireworm) and can be carriers of diseases. To get rid of rhizomes, they carry out plowing of the field or manual digging. Additionally, the soil can be treated with herbicides.

They dig up the soil in order to increase its water and air permeability, saturate it with oxygen and get rid of the larvae of insect pests hidden in the lower layers of the soil. Sometimes two autumn digging is required at intervals of 30-45 days, especially if the ground is too heavy.

Organic fertilizers

Manure, compost and ash are most in demand from organic matter. Micro and macro elements in them are balanced by nature itself and are easily absorbed by plants.

In order not to attract pests preparing for winter, gathering on the heat generated by manure, it is better to apply it in late autumn, after the first frost, after mixing it with compost. In addition to the usual mullein, horse and rabbit manure can be used. Pork preserves up to 18 months, so it is brought in only in exceptional cases.

Freshly cleaned from cattle is not suitable for autumn digging, since it contains seeds of weeds that will sprout in spring.

Attention! Avoid organic fertilization if the soil is contaminated with potato nematode.

Minerals and siderates

In the fall, substances are introduced that dissolve more slowly and do not wash out of the soil longer:

• "Nitroammofosku";
• urea;
• "Superphosphate".

A general rule is observed: it is better to slightly undernour potatoes than to allow an excess of nutrient compounds. For example, manure reduces the rate of mineral nitrogen preparations, "Superphosphate" is not mixed with urea. You should be careful with the combination of inorganics with ash.

How to fertilize the soil for potatoes in the fall without using special means? A gentle way of enriching the soil is sowing it with green manure. These plants are not grown for harvest but as organic fertilizer. Siderata prevent weeds from growing, protect the soil from dehydration and weathering, and prevent deep soil freezing.

For potatoes, mustard, rye, colza and phacelia are optimal - they sprout quickly and gain weight.

Normalization of acidity

With the help of fertilizers, you can even out the pH of the soil: acidify alkaline with leaf compost or peat, lime acidic with ash.

To determine acidity, different methods are used:

1. Pay attention to wild vegetation. Strongly acidic soils are preferred by plantain, pansies, horse sorrel and horsetail, and neutral and slightly acidic soils are preferred by clover, nettle, field bindweed, coltsfoot.
2. Check the reaction to vinegar. The pH neutral soil will bubble.
3. Use commercial acidity test strips.

Fertilizers

Fertilizers have special properties and must be applied to the soil in certain quantities and combinations. We offer options for fertilizing potatoes in the fall.

Cow dung

The advantages of mullein are high nutritional value, availability and relative cheapness. It is possible to agree on the supply of cow dung on almost any farm or in household yards.

The chemical composition of cow dung includes a large amount of nitrogen (especially bedding mullein with rotted straw and hay residues), phosphorus, potassium, calcium and magnesium.

The degree of decomposition is distinguished:

• fresh,
• half-ripe, obtained after 3-4 months storage;
• humus, the formation of which takes 6-12 months.

Fresh manure is rich in ammonia, often contains eggs of worms and other pathogenic microflora. To get rid of the parasites, the mullein is composted or infused. The temperature inside the compost heap reaches 65 ° C, and the eggs of helminths die, the percentage of germination of weeds decreases. therefore the most valuable is the semi-perverted type - such biomass is loose and small, it contains a lot of nutrients.

Humus looks like a homogeneous, dark mixture with a pronounced earthy smell. It is good for growing seedlings, mulching and as a well filler during and after planting.

Reference. It is usually advised to apply 5 kg of manure per 1 m², but these rates are acceptable if feeding is done every 3-4 years. With annual fertilization, from 500 g to 1 kg is sufficient, depending on the type of soil.

Bird droppings

Chicken manure is the most effective fertilizer for potatoes, since it is less watery than the excrement of other poultry.It is strong and fast-acting and must be used with caution.

Fertilizer benefits:

• poultry manure contains 3 times more nitrogen and phosphorus than cow manure, contains potassium in the form of readily soluble salts, manganese, sulfur, etc .;
• has a prolonged effect, so it is enough to make it every 2-3 years;
• increases the resistance of crops to late blight, scab, root rot and other infectious diseases.

Composting chicken manure is introduced into the soil for potatoes. To do this, it is sprinkled with plant residues, peat and earth and left to ripen for the entire summer period. Application rate per 1 m² - 500-700 g of litter.

Reference. Specialty stores sell dried and sterilized poultry manure products in the form of granules, balls and powder. They are safer than fresh fertilizer.

Compost

This product of natural decay is the most affordable fertilizer, because you can make it on your own from almost any organic waste: food residues, straw and hay, sawdust, tops of root crops. To accelerate maturation, special catalyst substances are introduced into the compost, and mineral additives are added to enrich the composition.

Attention! In order not to make a breeding ground for fungal and bacterial diseases from the compost pit, you should not put nightshade tops (potatoes, tomatoes, eggplants, peppers), apples, spoiled bread in it. Fruits with large seeds and weeds with seed boxes and roots should be avoided.

Half-rotted compost is suitable for autumn digging; during the winter, the remains will have time to completely decompose. It is introduced according to the principle of a puff cake, alternating with manure, straw or fresh mown grass, and 10-15 cm of ordinary soil is poured on top and watered with water or a solution of microbiological fertilizers.

Wood ash

The main purpose of this fertilizer is to alkalize acidic soils and increase the resistance of plants to diseases.

The composition largely depends on the initial raw material:

• straw ash, especially after burning sunflower and buckwheat stalks, leads in terms of potassium content - 25-35%;
• ash from birch and pine firewood is the richest in calcium - 30-40%.

Other nutrients include phosphorus in an easily assimilated form, manganese, magnesium, sulfur, boron, iron, and molybdenum.

Ash cannot be used simultaneously with nitrogen fertilizers, for example, manure, since it activates the activity of nitrogen-fixing bacteria. Its best "companions" are humus (compost) and peat.

The long-term effect of ash application is especially noticeable on heavy clay soils, but it is washed out faster from sandy soil.

Reference. Ash is used in crumbly form and as a solution - 100-150 g per 10 liters of water. In the fall, apply 60-100 g of fertilizer per 1 m² of soil.

Phosphate fertilizers

Among the phosphorus fertilizers, the most popular are:

1. Phosphorite flour... Contains 19-30% calcium phosphate. Suitable only for podzolic and peaty soils and is applied in combination with acidic fertilizers, for example, with ammonium sulfate or manure.
2. Simple and double "Superphosphate" include 16-20% and 43-46%, respectively, of water-soluble calcium phosphate. They are used on all types of soils.
3. Combined fertilizers - "Nitrofoska" and "Nitroammofoska". They also contain nitrogen and potassium.

For the autumn preparation of the soil for potatoes, choose Nitroammofoska (30 g per 1 m²), as well as simple (20 g) or double (10 g) Superphosphate in combination with nitrogen and potassium fertilizers.

Important! Phosphates work best in tandem with potash fertilizers, so they must be applied at the same time.

Urea

The academic name of the fertilizer is carbamide. It has been used in agriculture since the 18th century to enrich the soil with nitrogen.

Urea dissolves well in water, but is not washed out of the soil under the influence of precipitation, therefore, requires careful use.Most often, such fertilizer is applied inside the hole when planting tubers, and then in the form of root and foliar dressings during the summer. In autumn it is used immediately after harvest to avoid the formation of harmful compounds at low temperatures.

It is interesting:

How to feed cucumbers with a mullein.

Rules for feeding cucumbers with chicken manure in the open field and in the greenhouse.

Feeding tomatoes with urea: why is it needed and how to do it.

Nitrate fertilizers

Saltpeters contain nitrogen in the form of nitric acid - nitrates, they quickly dissolve in the soil. In autumn, after harvesting potatoes, sodium nitrate is mainly used as fertilizer.

The lack of such fertilizers in rapid leaching from the soiltherefore it is recommended to apply them in the spring, shortly before sowing.

Reference. Nitrate fertilizers are physiologically alkaline, therefore, they are effective on acidic soddy-podzolic soils, and they are avoided on saline soil and salt licks.

Ammonia fertilizers

These include:

• ammonium nitrate in granules;
• aqueous ammonia, or ammonia water;
• nitrogen-phosphorus fertilizers - "Ammophos" and "Diammophos".

Nitrogen in the ammonia (ammonium) form dissolves well in water and is quickly absorbed by plants. It evaporates just as quickly from the soil, therefore, ammonia substances are introduced into the soil to a depth of 3-4 cm and sealed.

Potash

Potatoes love potassium, but not all potash formulas are created equal.

Potassium chloride slows down the growth of plants and reduces the amount of starch in the tubers, so it is better to choose sulfate forms for fertilizing. But if you apply chlorine-containing potash fertilizers in the fall, they will disinfect the soil and partially wash out of it by the spring, without harming the plantings.

Potassium sulfate (potassium sulfate) enriches the soil with sulfur and has a positive effect on the keeping quality of tubers. However, this shape is not suitable for neutral and alkaline soils.

Rules for the selection of fertilizers for different types of soil

The main characteristics of the soil are the presence of humus, soil structure and acidity. To answer the question of how to fertilize a potato field in autumn, you should first determine the type of soil.

Clay soil

Clay soils are heavy and dense, they slowly warm up, poorly permeate moisture and, as a rule, have an acidic environment. Such properties are bad for the potato yield.

Liming helps to reduce acidity. To do this, in the fall, slaked lime or "fluff", dolomite flour, wood ash, ground chalk and crushed eggshells are added to the soil. When using lime, additional fertilization with manure will be ineffective, therefore, organic fertilization is postponed until spring.

To make the soil more air and water permeable, loosening materials are added: sand, light leaf humus, peat at the rate of 1 bucket per 1 m².

Loam

This type of soil is distinguished by:

• granular lumpy structure;
• a sufficient amount of nutrients;
• high level of water permeability and air permeability.

Despite the presence of heavy and dense clods in the soil, loam is favorable for the cultivation of vegetable crops.

To maintain optimal conditions, loamy soils need to be enriched with organic matter in the fall - compost and manure. Of the mineral fertilizers, sodium nitrate is effective.

Sandy

The main disadvantage of sandy soils is that they are poor in humus (the humus content is about 1%), they do not retain moisture well, they overheat during the day and cool quickly at night. But this loose soil is easy to handle.

To get a good harvest of potatoes, compaction components are introduced into sandy soils: peat, clay flour and compost. Once every 2 years, rotted manure is laid in the deep layers. Potassium magnesium sulfate (potassium magnesium sulfate) helps to fill the lack of magnesium.

Reference. Organic and mineral fertilizers must be applied regularly as they decompose quickly in sandy soil.

Chernozem

Chernozem is rich in humus (up to 15%), good air and moisture permeability... Due to the high calcium content (70-90%), the soil reaction is neutral or close to neutral. Such soil has natural fertility, so it itself can be used as fertilizer.

If the chernozem is of low quality (humus only 4%) or the soil is depleted, it can be additionally fed with nitrogen and phosphorus fertilizers - potassium sulfate or ammonium sulfate. Once every 5-6 years, it is useful to give the land "rest" by sowing green manure.

What fertilizers can not be applied in the fall for potatoes

For the winter, fertilizers cannot be applied that:

• contain spores of pathogenic microorganisms - fresh manure, compost from infected tops and weeds;
• violate the balance of micro and macro elements in the soil.

When combining different dressings, you should not mix some substances:

• alkaline media (ash, lime, chalk) reduce the effectiveness of nitrogen fertilizers (ammonium nitrate, ammophos, ammonium sulfate);
• manure contains a lot of nitrogen, therefore, does not require additional introduction of nitrogen-containing substances;
• Ammonium nitrate in combination with dry organic matter (peat, straw, sawdust) can lead to spontaneous combustion.

The most common mistakes when applying autumn fertilizers:

• the pH of the soil is incorrectly determined;
• the dosage is violated;
• expired fertilizers are applied;
• the recommendations for the combination of substances are not followed.

Conclusion

An experienced gardener knows that summer cottage work does not end with harvesting. For the next season to be successful, you need to correctly fertilize the land for future plantings. To do this, it is important to determine the type of soil, acidity, select the fertilizer necessary for the soil and select the fertilizing that is combined with it.