Effect of bromoxynil herbicide and gibberellic acid on growth characters, yield, chemical composition and associated weeds [chenopodium album L.] of fenugreek plants under salinity irrigation

ABSTRACT

Two pot experiments were conducted during the two successive seasons 1996/97 and 1997/98 in the green house of the National Research Centre, Dokki, Giza Govemorate to investigate the effect of salinity [control - 2000 and 4000 ppm], Bromoxynil herbicide at the rate of 1 L/fed. and GA 3 [50 ppm] and their interactions on fenugreek growth, yield and chemical composition in addition to their effect on associated weeds [Chenopodiwn albwn L.] The results indicated that in both seasons Bromoxynil alone or in combination with GA 3 under all salinity levels significantly depressed the growth of associated weeds [Chenopodiuin albwn L.] by decreasing their fresh and dry weights. The results also showed that there were significant increases in growth characters, yield, yield components and seed content of N, P, K, Fe, Zn, Mn, Cu, carbohydrate and protein% in seeds under 2000 ppm salinity level. However, increasing salinity level to 4000 ppm reduced the above mentioned characters except N, Fe, Mn, Zn content and protein% which increased by increasing salinity level. Bromoxynil, alone under all salinity levels showed an insignificant increase in characters which were studied. On the other hand, GA 3 alone or in combination with Bromoxynil gave a significant increase in growth, yield and chemical composition of fenugreek seeds. Spraying GA 3 on plants treated with Bromoxynil, under 2000 salinity level gave the highest values of growth parameters and yield of fenugreek plants