The earlyis fall of leaves and fruits in plants in caused by the deficiency of:

Explanation

The correct answer is phosphorus. Phosphorus is essential for the development of roots, flowers, seeds, and fruit. Its deficiency can lead to poor structural integrity and premature abscission, or the dropping of leaves and fruits. Potassium helps in the overall plant health and resistance to stresses but does not specifically prevent early leaf and fruit fall. Magnesium is crucial for chlorophyll production and photosynthesis but does not prevent abscission. Nitrogen is important for growth and green coloration but not directly involved in the prevention of early leaf and fruit drop.