crop nutrition advice
crop nutrition advice
Everything you need to know about apples fertilization, best practice, suitable products, field trials and more.
Advice for growing Apples (Malus domestica)
Apple performs better in soils with pH between 6 and 7.
In soils with high pH (above 8) phosphorus mainly but also other micronutrients deficiency may appear.
In soils with a high content of active limestone, there could be problems for the absorption of microelements such as Iron.
Plants are very sensitive to soil salts (maximum salinity of 2-3 mS / cm) and exchangeable sodium.
Water needs are around 600-800 mm / Ha between bud break and leaf fall.
Calcium management is very important for the quality of the harvest and so it’s also important to have a soil and foliar strategy.
Estimated nutrient uptake (kg/t):
|Month||Physiological stage||N (kg/ha)||P2O5 (kg/ha)||K2O (kg/ha)|
|May||Fruitlet development and bud initiation||20||15||40|
|June||Fruit development & vegetative development||10||10||40|
|July||Fruit development & vegetative development||5||5||40|
|August||Beginning of harvest||5||5||10|
|September||End of harvest||10||5|
|October||End of harvest||10|
Dynamic of nutrient uptake over a crop season in apples
|Nitrogen||It is the most important mineral element in plant nutrition. It is a constituent of amino acids, proteins and nucleic acids and therefore is essential in growth, both in its cell division and elongation phase. It is part of the chlorophyll molecule, directly affecting photosynthesis, since it is part of the rubisco enzyme, fundamental in the cycle of carbon dioxide fixation by the leaf. Without an adequate supply of N, the crop takes too long to reach a development that makes it productive and in the case of a tree in production it does not achieve an agile renewal of the fruit wood for the following season.|
|Potassium||Potassium's main role is directly related to quality and production. Increased potassium levels improve the quality and quantity of the crop. The main roles of potassium are; protein synthesis, photosynthetic processes and sugar transport from leaves to fruits.|
|Phosphorous||The main role of phosphorus is structural, forming part of ATP. These compounds store the energy from photosynthesis and release it at specific sites in the plant where it is required. They are essential in all processes in which there is active cell division, such at times of root development and in flowering.|
|Calcium||It is essential for the formation of the plant structure and the cell wall. It is important for the proper functioning of absorption mechanisms, as well as to prevent the escape of elements outside the cells. It is also at the center of the plant's defense mechanisms, which helps it detect and react against external factors.|
Key aspects of apple crop
The apple tree is more resistant to cold than other species of pome such as the pear tree. Also, it does not need as much heat and light to ripen and the apple tree prefers humid climates to dry ones. Although the flowers are sensitive to late spring frosts, the apple tree supports temperatures below -10ºC, without affecting its bark, although below -15ºC some flower buds may be lost.
The main limitation for the cultivation of apple trees in the southern regions is the requirement of cold hours, since although there are varieties with low requirements (around 500 cold hours) most of the most productive varieties need more than 1500 cold hours).
In southern and southeast exposures, high light intensity can produce vitreous fruits and high heats favor internal darkening, surface scalds, or sunburn.
It is an undemanding crop in the soil, with a shallow root system, although it prefers deep and light clay soils, it does well in heavy or shallow soils.