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| Zaller, Johann G. |
| The effect of foliar sprays with aqueous vermicompost extracts on growth, yields, morphological and chemical fruit quality and natural infection with late blight disease (Phytophthora infestans(Mont.) de Bary)) on three tomato varieties (Lycopersicon esculentum Mill., cv. Diplom F1, cv. Matina, cv. Rheinlands Ruhm) was investigated in a field experiment. Extracts were prepared of vermicompost produced from fruit, vegetable and cotton waste by redworms (Eisenia fetida Sav., Lumbricidae); tap water served as control treatment. Foliar application (spraying) of vermicompost extracts did not affect plant growth, biomass or nutrient allocation, or yields and number of fruits of the three tomato varieties; however, for several dates it significantly reduced the... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection Composting and manuring. |
| Ano: 2006 |
URL: http://orgprints.org/10450/1/Zaller_2006BAH.pdf |
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| Zaller, Johann G. |
| Commercial potting media often contain substantial amounts of peat that was mined from endangered bog and fen ecosystems. The main objectives of this study were to assess (1) whether the amendment of 0, 20, 40, 60, 80 and 100% (vol/vol) of vermicompost (VC) to a fertilized commercial peat potting substrate has effects on the emergence, growth and biomass allocation of tomato seedlings (Lycopersicon esculentum Mill.) under greenhouse conditions, (2) whether possible impacts on seedlings can affect tomato yields and fruit quality even when transplanted into equally fertilized field soil, and (3) whether effects are consistent among different tomato varieties. Amended VC was produced in a windrow system of food and cotton waste mainly by earthworms Eisenia... |
| Tipo: Journal paper |
Palavras-chave: Composting and manuring Crop health; Quality; Protection. |
| Ano: 2007 |
URL: http://orgprints.org/18272/1/Zaller_2007SciHortic.pdf |
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| Zaller, Johann G. |
| Understanding the competitive ability of Rumex obtusifolius against grassland species is essential for developing efficient control strategies against docks. Here we present results from a greenhouse experiment where we tested shoot and root competition between Rumex regenerating from rhizome fragments and grassland species (grasses, herbaceous and leguminous species). Competitive ability was expressed as the relative above- and belowground biomass partitioning and, concentrations and allocation of carbon and nitrogen of the plant species studied. Regeneration of Rumex was significantly affected by competition through neighbouring native grassland species. Rumex responded to concurrent shoot and root competition of grassland species with 50% more... |
| Tipo: Journal paper |
Palavras-chave: Biodiversity and ecosystem services; Weed management. |
| Ano: 2004 |
URL: http://orgprints.org/18280/1/Zaller_2004JPDP.pdf |
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| Zaller, Johann G. |
| Commercial potting media often contain substantial amounts of peat that was mined from endangered bog and fen ecosystems. The main objectives of this study were to assess (1) whether the substitution of peat by vermicompost (VC) in potting substrate affects the emergence and biomass allocation of tomato seedlings (Lycopersicon esculentum Mill.) under greenhouse conditions and (2) whether VC amendments in seedling substrate affect tomato yields and fruit quality after plants were transplanted into equally fertilized field soil. Amended VC was produced of food and cotton waste in a windrow system by Eisenia fetida Sav.. Vermicompost amendments significantly influenced, specifically for each tomato variety, emergence and biomass allocation (root:shoot ratio)... |
| Tipo: Journal paper |
Palavras-chave: Composting and manuring Crop health; Quality; Protection. |
| Ano: 2007 |
URL: http://orgprints.org/18267/1/Zaller_2007EJSOBI.pdf |
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| Zaller, Johann G. |
| In perennial grasslands R. obtusifolius (broad-leaved dock) is often surrounded by certain plant species. Thus, it is hypothesized for the current study that Rumex can affect their neighbouring plant species by allelopathic interactions. To test this hypothesis, in a series of laboratory and field experiments aqueous extracts of green R. obtusifolius leaves were sprayed on seeds of 14 herbaceous plant species (graminoids, non-leguminuous forbs and leguminuous forbs) commonly native to perennial grasslands and its effects on seed germination compared with those with tap water spraying. An allelopathic effect was defined as inhibitory influence of Rumex extracts on seed germination relative to tap water. Generally, results of the laboratory experiments... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2006 |
URL: http://orgprints.org/18277/1/Zaller_2006JPDP.pdf |
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| Schader, Christian; Zaller, Johann G; Köpke, Ulrich. |
| In many countries, cotton is traditionally intercropped with other plants in order to increase yields and to control pests. We tested the effects of intercropping cotton (Gossypium barbadense L.) and basil (Ocimum basilicum L.) during one field season on pest infestation, yields, and economical parameters in the Governorate of Fayoum, Egypt. Basil, which is known for its repellent effect on various insect pests, was mixed with cotton in three different intercropping rates (no, medium and high basil area fraction) and two row distances (60 and 90 cm) using a substitutive design with four replicates. Compared with the non-intercropped plots, cotton-basil intercropping significantly reduced total pest infestation and led to a 50% reduced abundance of the pink... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions. |
| Ano: 2005 |
URL: http://orgprints.org/10456/1/Schader_2005.pdf |
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