Boron deficiency in fodder crops can be seen when boron is

Answer: Option C

Boron deficiency in fodder crops can be seen when boron is 1 - 2%.
Boron deficiency is a common deficiency of the micronutrient boron in plants. It is the most widespread micronutrient deficiency around the world and causes large losses in crop production and crop quality.
Boron is an essential micronutrient which means it is essential for plant growth and development but is required in very small quantities. Although Boron requirements vary among crops, the optimum boron content of the leaves for most crops is 20 - 100 ppm. Excess boron can result in boron toxicity and the toxicity level varies between plants.