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Growing Conditions of Potato

The potato (originally from South America), is one of the most important food crops in the world.

400 million tons of potatoes are produced each year when China is the largest producer, holding 25% of world’s production.

The world average yield of potato is 160 cwt per acre (20 ton/ha) and in many developed countries the average is more than 320 cwt per acre. Yields of 600  cwt/acre per acre are achieveable

GROWING CONDITIONS OF POTATO

CLIMATE

Growing potatoes requires cool climate. Potatoes grow best in temprature of 15-20(°C). Nevertheless, it has the ability to adapt to a wide range of climate conditions.

The potato grows best in well-drained soils and pH is optimal between 4.8 to 5.8.

The maximum tolerated EC (salinity threshold) is 1.7 dS / m.

Although sandy soils have clear advantages in mechanization of farming, it requires high amounts of fertilizer. The use of tissue analysis is important as it can warn and prevent nutritional deficiencies.

POTATO NUTRIENT REQUIREMENTS

The Importance of Macronutrients in Potato

Nitrogen: One of the most important nutrients, that is required in relatively high quantities for achieving high yields. Nitrogen is required especially in the initial stage of the vegetative growth.

Excess of nitrogen might cause excessive foliage growth, at the expense of tuber growth.

Under many conditions, nitrate nitrogen is preferred over ammonium nitrogen.

Phosphorus: Encourages root growth and tuber formation. Adequate supply of phosphorus is important in the tuber initiation stage.

Potassium: Potatoes have a very high potasium requirements. 50% is required at tuber innitiation. Fundamental in metabolic processes and disease prevention. Potassium deficiency result in reduced yields.

METHODS TO INCREASE NUTRIENT UPTAKE

There are methods to help absorb nutrients when the soil temperature is low, such as Foliar Fertilization: the application of nutrients directly to the leaves.

  •   The plant shows rapid response to foliar application.
  •   Foliar applications during the growth cycle help in increasing tuber size.
  •   Vesicular Arbuscular mycorrhizal (VAM) is a fungus that penetrates the cells of the root, establishing a symbiotic relationship with the plant. Application of VAM  provides mineral nutrients to the plant and, in return, the plant delivery sugars and other products of photosynthesis to the fungus. It can increase the availability of P, Ca, Mg, Zn, Fe, Mn and B.

OPTIMAL FERTILIZATION

The development of optimal fertilization program, based on critical growing periods, is key to achieving high yields when growing potatoes.

Nutritional deficiency and a wrong nutrition plan, especially at a wrong timing duriing the growth, affects crop yield and quality.

The design of an optimal fertilization program should be based on the nutritional uptake, related to the target yield, and field test results, such as soil, water and tissue analysises.

NUTRIENTS – SUMMARY TABLE

ELEMENTSDEFICIENCIESEXCESSES
NitrogenReduced total yield Reduced tuber sizing Pale stunted foliageDelayed maturity Excessive top growth Hollow heart & growth cracks Reduced tuber specific gravity Difficulty in top killing
PhosphorusReduced early vigor Delayed maturity Reduced yieldTies up other elements such as calcium and zinc
Potassium
(Potash)
Reduced nitrogen uptake Reduced yield Increased storage black spotReduced tuber specific gravity Reduced calcium and/or magnesium uptake Poor soil structure
CalciumReduced root growth Deformed foliage growth tips Reduced yield Reduced tuber quality Poor soil structureReduced magnesium uptake
MagnesiumReduced photosynthesis rate Reduced yield, Reduced tuber formationReduced calcium uptake



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