Citrus is the most extensively produced tree fruit crop in the world. It is growing in a wide diversity of climatic and soil conditions. its importance for the world is demonstrated by its wide-scale cultivation under tropical and sub-tropical conditions. Also, it has a tremendous socio-economical and cultural impact on the whole society. The multifold nutritional and medicinal values make this type of fruit indispensable in several parts of the world. Citrus is primarily valued for the fruit, which is either eaten alone as fresh fruit, processed into juice.
Potassium plays an important role in improving the productivity and quality of citrus crop and the crop's need for potassium increases significantly during the stage of growth and development of fruits, so it must be added in sufficient quantities to ensure optimal growth of fruits. The most important roles also:
Phosphorus plays an important role in improving the productivity and quality of citrus crop. The most important roles of phosphorus for citrus crop: -
Calcium considered one of the most important effective nutrients on citrus crop. Some of the physiological roles of calcium in citrus are:
Potassium deficiency Symptoms appear on leaves in form of yellowing in general, in addition to burning of external leaves edges; moreover, potassium deficiency leads to reduction of yield and decreases fruit quality.
Trees suffer from phosphorus deficiency are small leaves with a dark green color and the leaves turn bronze and fall early. Phosphorus deficiency also leads to:
Calcium deficiency symptoms on citrus crop appear wrap the leaves in the form of a hook and the leaves are light green in addition , as calcium shortage it is leads to:-