SPRING CEREAL RESPONSE TO IMAZAMETHABENZ AND FENOXAPROP-P-ETHYL AS INFLUENCED BY ENVIRONMENT

The influence of temperature, soil moisture, and light intensity on th e tolerance of spring wheat, durum wheat, and spring barley to imazame thabenz and safened fenoxaprop-p-ethyl was determined in growth chambe r experiments. Imazamethabenz at 500 g/ha reduced plant height and sho ot fresh weight of durum and spring wheats grown under prolonged 70% s hade. The height of durum and spring wheats was reduced by imazamethab enz under a low temperature regime. Compared to the plants grown under standard conditions, the shoot weight of spring and durum wheat plant s was not reduced by imazamethabenz under drought, or high and low tem perature conditions. Barley tolerance to imazamethabenz was not affect ed by environment. All three spring cereals were tolerant to fenoxapro p-p-ethyl plus a safener at 92 g/ha; and such tolerance was not greatl y affected by various environments examined.