Alireza Koocheki; GhorbanAli Asadi; Reza Ghorbani; Elham Azizi
Volume 11, Issue 2 , July 2013
Abstract
In order to investigate the role of marigold (Tagetes erecta) interference effects on weed composition and diversity of tomato (Solanum lycopersicum), an experiment was conducted as split plot based on complete randomized block design with 3 replications at Agricultural Research Station, Ferdowsi University ...
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In order to investigate the role of marigold (Tagetes erecta) interference effects on weed composition and diversity of tomato (Solanum lycopersicum), an experiment was conducted as split plot based on complete randomized block design with 3 replications at Agricultural Research Station, Ferdowsi University of Mashhad, Iran, during 2010 to2011. Treatments included three tomato varieties (Jina, Flat and strain hitack Tork) and five cropping patterns (tomato monoculture and marigold- tomato intercropping with 1:1, 1:2, 1:3 and 1:4 ratio). Results indicated that in the first sampling, the highest weed density was observed in tomato monoculture (78.96 plants per m2). The lowest weed density was obtained in marigold and tomato intercropping with 1:3 ratio (37.62). In the second sampling, the lowest weed density was in marigold and tomato intercropping with 1:3 ratio. In the first sampling, total dry weight of weed was more than that in the second sampling. In two sampling, the highest total dry weight of weed was observed in the marigold and tomato intercropping with 1:3 ratio. By altering the cropping pattern, Shannon, Margalof and Simpson diversity indices of weed were changed. The lowest weed diversity indices were observed in the marigold and tomato intercropping with 1:1 ratio. Also, significant positive regressions were obtained between insect diversity indices (Shannon, Margalof and Simpson) and weed diversity indices. y Indices, Intercropping, Monoculture, Weeds.
Alireza Koocheki,; Ghorban-Ali Asadi; Elham Azizi
Volume 10, Issue 2 , January 2013
Abstract
In order to investigate of Marigold (Tagetes erecta) allelopathic effects on insect diversity and diseasesof tomato (Solanum lycopersicum), an experiment was conducted as a split plot based on complete randomized block design with 3 replications at the Agricultural Research Station, Ferdowsi University ...
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In order to investigate of Marigold (Tagetes erecta) allelopathic effects on insect diversity and diseasesof tomato (Solanum lycopersicum), an experiment was conducted as a split plot based on complete randomized block design with 3 replications at the Agricultural Research Station, Ferdowsi University of Mashhad, Iran, during 2010 and 2011. Treatments included three tomato varieties (Jina, Flat and strain hitack tork) and five cropping patterns (tomato monoculture and marigold-tomato intercropping) with ratios of 1:1, 1:2, 1:3 and 1:4. Results indicated that the highest percentage of predator populations was observed in tomato and marigold intercropping at a 1:2 ratio. The lowest percentage of predator populations was obtained in tomato and marigold intercropping at a 1:1 ratio. The highest Margalof and Simpson diversity indices of insect was obtained in marigold and tomato intercropping. In total harvestings, the highest relative frequency of healthy fruits was in tomato and marigold intercropping at a 1:2 ratio. Amongtomatovarieties, Hitak-strain Tork and Jina had the highest relative frequency of healthy fruits. The highest relative frequency of healthy fruits and the lowest relative frequency of unhealthy fruits were observed in the Jina variety (0.28 and 0.63 respectively). The positive significant regression relationship was obtained between Shannon and Margalof index with the relative yield of healthy fruits per unit area.
