Nitrogen in plant leaves is responsible for imparting green color to the chloroplasts. After administering regular amounts of nitrogen to the plants in a field, rapid and prolonged vegetative growth coupled with dark green color of leaves is observed. Also, crop maturity is delayed and yield of the plant is reduced. Which of the following is a reason?
◦ deficiency of nitrogen concentration found in the later stages of plant growth
◦ available concentration of nitrogen found in the critical range for plant growth
◦ excessive nitrogen concentration found in the later stages of plant growth
◦ available concentration of nitrogen found in the sufficient range for plant growth