For safe irrigation water, the concentration of Boron should be -

Correct option is A

· Boron in Irrigation Water:
· Boron is an essential micronutrient for plants, but excessive levels can be toxic.
· For safe irrigation, the Boron concentration in water should be less than 3 ppm (parts per million) to avoid adverse effects on sensitive crops.
· Impact of Higher Boron Levels:
· Higher concentrations (>3 ppm) can lead to toxicity symptoms in plants, such as leaf burn and reduced growth, especially in crops like citrus, beans, and potatoes.