जड़ के विकास और पुष्पन (फूल आने) के लिए मुख्य रूप से कौन-सा प्राथमिक पोषक तत्व उत्तरदायी है?

Prolonged phosphorus deficiency in crop plants usually results in which of the following symptoms?

Deficiency of boron in plants often causes which symptom in growing tips and root apical meristems?

Stunted growth, small leaves ('little leaf'), and rosetting are characteristic symptoms of which micronutrient deficiency?