While a necessary nutrient, high boron levels cause plant toxicity, and concentrations should not exceed those given in Table 10. Irrigation water salinity tolerances 1 for different crops. Chloride tolerance of agricultural crops. Listed in order of tolerance. These data serve only as a guideline to relative tolerance among crops.
Absolute tolerances vary, depending upon climate, soil conditions and cultural practices.
C Less tolerance during emergence and seeding stage. D Values for paddy rice refer to the Cl - concentration in the soil water during the flooded growing conditions. Limits of boron in irrigation water. Relative susceptibility of crops to foliar injury from saline sprinkling waters. These data are presented only as general guidelines for daytime sprinkling.