Response of some wheat cultivars to weeding and fertilizer treatments [Sinapis arvensis - 90% of the total weed cover; Ecballium elaterium; Salvia syrica; Convolvulus althaeoides; Amaranthus retroflexus; Hyoscyamus reticulatus; Cardaria draba; Astome seselifolium; Asperula arvensis]
1993
Qasem, J.R. | Tell, A.M. (Jordan Univ., Amman (Jordan))
The competitive ability of the most common wheat (Triticum durum L.) cultivars grown in Jordan was evaluated at high and low fertility levels in two field experiments carried out at two locations during the 1990/1991 growing season. Results showed that the cultivars were different in their competitive abilities with weeds and in their respose to fertilizer rates. These differences were more pronounced at high fertility levels. In Al-Jubeiha, Sham-1 was the best cultivar in response to fertilization, while L-88 and Hourani were the worst. Addition of fertilizers did not compensate for weed control and resulted in considerable yield losses of L-88 cultivar at Al-Jubeiha, and reduced or caused no appreciable increase in the grain yield of all cultivars grown in the Al-Mushagar area. At high fertilizer rates, Stork proved to be the best cultivar, tolerating weed infestation in both locations. Responses of cultivars to weed-free treatment were different. Grain yield of all cultivars grown in Al-Mushagar area was increased in response to weed-free treatment, while only some cultivars showed similar response to this treatment under Al-Jubeiha's conditions. Korifla nad Deiralla 2 were the least responsive cultivars to weed-free treatment in both locations. Combination of weed-free treatment and high fertilizer rate caused great increases in grain and straw yields of all cultivars compared with the control. However, under Al-Mushagar conditions, addition of fertilizer to weed-free plots did not significantly improve the grain yield of any cultivar over its yield in weed-free plots receiving no fertilizers
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