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Competition of weed community and its control in onion nursery fields
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Abstract: Four field experiments were conducted at Sids Research Station, Agriculture Research Center, Beni Suef Governorate, Upper Egypt during 2010 and 2011 winter seasons. Two experiments were carried out to estimate the impact of fourteen treatments i. e. seven intervals of weed competition (weed infestation) and seven intervals of weeds removal (weed free), with two weeks interval between each treatment which began from sowing. Another two experiments were conducted to evaluate the efficacy of some herbicides i. e. Amex at 1.75 L./fad., Stomp extra at 1.7 L./fad., Starane at 150 cm3/fad. + Fusilade super at 0.5 L./fad.; and Sencor at 100 g/fad. + Fusilade super at 0.5 L./fad. and Iquopart at 200 cm 3/fad. + Fusilade super at 0.5 L./fad. as well as hand weeding twice and unweeded check on controlling annual weeds associated with onion transplants and its effects reflection on onion transplanting yields.
The main findings of these studies showed that the weed infestation rate under onion nursery field was 2.4 and 2.5 kg fresh weight/m2, which reduced yield of onion transplants per faddan by 80 and 75.9% competition treatment of onion transplant for whole season in both 2010 and 2011, respectively, compared with weed free for whole season treatment. Also, results show that the quadratic equations which had highest R2 (0.986 and 0.984) for weed free period and (0.962 and 0.957) for weed competition durations in 2010 and 2011 seasons, respectively. They results were fit to represent the data of critical periods of weed competition to onion nursery and ten weeks period is required to be weed free to obtain the maximum yield of onion transplants and two weeks of weeds infestation can be allowed without onion transplants yield reduction.
On other hand, the use of Iquopart at the rate of 200 cm3/fad. plus Fusilade super at the rate of 0.5 L./fad gave the highest controlling percentages of the annual broad leaf and grassy weeds with the highest values of onion transplant( yield and quality) without damage on chlorophyll pigments in the onion transplants can be advised for weed control in mentioned critical period of onion nursery.
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| URL |
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| Publication year |
2012
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| Pages |
550-569
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| Organization Name |
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| City |
الشرقية
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| serial title |
egypt. J. of appl. Sci
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| ISSN |
1110-1571
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| Author(s) from ARC |
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AGROVOC
TERMS |
Onions.
Weed control.
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| Proposed Agrovoc |
critical period;nursery fields;
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| Publication Type |
Journal
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