Effect of chlorsulfuron and 1, 8 naphthalic anhydride on uptake of 45Ca in maize

The effect of chlorsulfuron on uptake of ⁴⁵Ca was studied in maize (Zea mays L. cv. Earliking) plants grown from seeds dusted with 1, 8 naphthalic anhydride (NA). ⁴⁵Ca absorption in sand-grown maize was significantly decreased when chlorsulfuron was applied to the foliage but this was not so when seeds had been dusted with NA. Uptake of ⁴⁵Ca was also reduced when either root or shoot soil zones were separately exposed to chlorsulfuron. When seeds had been dusted with NA, uptake of ⁴⁵Ca from main roots was similar to that of untreated plants, but only when chlorsulfuron was localized in the shoot zone. NA did not counteract the severe reduction in ⁴⁵Ca absorption when chlorsulfuron was localized in the root zone.