EFFECT OF GROWTH REGULATORS AND HERBICIDES ON SUGAR YIELD , QUALITY AND ATTENDANT WEEDS OF SUGARCANE Saccharum officinarum L. GROWN IN DHULUIYA REGION.

Abstract

Field experiments were carried out on sugarcane Saccharum officinarum L. in the fields of the general company for industrial crops, Dhuluiya (within the central region of Iraq) to study the effect of some plant growth regulators and herbicides, added at the beginning of tillers stage, in Sugar yield , quality and attendant weeds of sugarcane (Variety: Co196). Split Plot Design was used with four replications, the main plots included herbicides 2, 4-D, bentazone and a control treatment (without herbicide). Plant growth regulators GA3, daminozide, mefluidide and control treatment (without PGR) was included in sub plots . The results indicated that the use of mefluidide with 2,4-D has led to highest decrease in weed density with achieve highest percentage of control (80.61 and 76.60 %) for both years respectively , while use of GA3 alone led to highest increase . it was found that the use of GA3 with 2,4-D has led to highest increase in percentage of sucrose ( 11.97 and 13.79 % ) for both years respectively ,while effect of GA3 alone shows highest increase in Brix(16.83 and 15.98 %) for both years respectively , So that the use of GA3 with 2,4-D led to highest increase in Purity (83.41 and 83.91 % ) for both years respectively, while use of daminozide treatment led to highest decrease . The interaction effect of mefluidide with 2,4-D treatment caused highest increase in sugar yield with an increase 34 and 31 % for both years respectively .