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Archive for the 'Crop production' Category

Crops and Cropping Systems

Which are the conclusions to be drawn for the environmental needs of wheat and maize with respect to their origin Weizen - Stammt aus dem fruchtbaren Halbmond (temperate region) o Keimt im Herbst bei Einsetzen der Niederschlagsperiode o Durchläuft vegetative Entwicklung bei kühlen und feuchten mediterranen Winterbedingungen im Kurztag o Mit länger werdenden Tagen kommt es zur Blüte und [...]

April 23rd, 2009
Topic: Crop Science, Product quality, Sustainable production under environmental stresses Tags: None

Effects of Intercropping Systems on Environment

Poster-Presentation in “Biodiversity and Ecosystems Goods and Services”, Dürr N. and Weber V. Intercropping cultivating two or more crops in the same space at the same time form of polyculture using companion planting principles Services provided by intercropping Genetic diversity physical barrier to fungal spread ↑complexity & competition of pathogens Induced resistance > rice blast [...]

December 3rd, 2008
Topic: Crop Science, Plant biodiversity Tags: None

Incubation experiment, nutrient use efficiency and total N recovery in ryegrass and white clover systems

Nutrient fluxes in soil plant systems, by BrynerS, HattF, WeberV Introduction Nitrogen is often the most limiting nutrient in organic cropping systems where no synthetic mineral N fertilizers are applied and where total N inputs are usually lower than in conventional systems (Oberson et al. 2007). There are several possibilities to improve N supply in [...]

June 30th, 2008
Topic: Crop Science, Plant nutrition Tags: None

Benefits of Azolla in lowland rice (Oryza sativa) cropping systems concerning N losses and fertilization

F. Hatt, V. Weber (2008) Azolla, a free-floating aquatic fern having symbiotic association with the N2 fixing cyanobacterial symbiont Anabaena Azollae can fix 30-60 kg N/ha in 30 days. It is either incorporated as green manure at the beginning of the cropping season or grown as a dual crop along with rice, in the standing [...]

June 14th, 2008
Topic: Crop Science, Plant nutrition, Sustainable production under environmental stresses Tags: None

“The availability of calcium dihydrogen phosphate fertilization for lolium, soybean and lupine.”

Written report for the course “Radio-isotopes in plant nutrition” in 2007/08 by DürrN and WeberV 1    Abstract Plants fertilized with different P-sources can have different ability to grow. It depends on the availiability of P from the fertilizer. In a pot experiment we compared the growth of ray grass, soybean and white lupine fertilized with [...]

February 3rd, 2008
Topic: Crop Science, Plant nutrition Tags: None

Stable Isotpes. Example of Deuterium (H) and Carbon (C). Competition among plant species in diverse communities

Carbon Discrimination against 13C during photosynthesis is a well characterized phenomenon. Plant matter produced during photosynthesis is depleted in 13C (lower 13C/12C ratio), compared to atmospheric CO2. The magnitude of this depletion mainly depends on the photosynthetic pathway of CO2 fixation. Plants endowed with C3 pathway have a lower 13C/12C ratio than plants exhibiting C4 [...]

January 31st, 2008
Topic: Crop Science, Plant biodiversity Tags: None

Nachernteverfahren und Qualität von Tafeläpfeln

Fallstudie Dauerkulturen mit Fokus auf Obstbau in Zusammenhang mit „Horticultural Systems“, Dezember 2007. Verfasst von FröhlichD, HattF und WeberV Einleitung Der Anteil Golden Delicious am gesamten Schweizer Tafelapfelangebot schwankte in den letzten Jahren zwischen 40 und 50%. Das optimale Erntedatum liegt rund um den 24. September. Innerhalb des vorliegenden Versuches wurden mehrere Parameter, die die [...]

January 31st, 2008
Topic: Crop Science, Product quality Tags: None

Arbuscular mycorrhiza fungi

Lab Report, Rhizosphere Ecology (weberv) Background Arbuscular mycorrhiza (AM) fungi are obligate symbionts that colonize the roots of over 80% of plants in all terrestrial environments. AM use C from plants and improve their growth through: Improve of nutrients supply such as P. Increase of the resistance to disease by physical protection and reduce of [...]

December 24th, 2007
Topic: Crop Science, Plant nutrition Tags: None

Direct and indirect bacterial number assessment in the soil

Lap report, Rhizosphere Ecology, WeberV, 24.12.2007 1 Practical Session No 2 1.1 Bacterial number assessment through cultivation To the soil NaCl solution was added. Then different dilutions from 10-1 to 10-10 of soil suspension were prepared. 200 µl of each suspension was spread on an agar plate. 1.2 DNA extraction from soil DNA extraction was followed after the [...]

December 24th, 2007
Topic: Crop Science, Plant nutrition Tags: None

Root architecture and organic acids

Lap report, Rhizosphere Ecology, WeberV, 24.12.2007 1 Practical Session No 1 1.1 Root architecture The roots of maize, flax and lupin were cut from the shoot and spread on a scanning plate. The roots were separated to achieve minimum root crossing points. Then water with 40°C was added to ensure that no water bobbles develop. Then the [...]

December 24th, 2007
Topic: Crop Science, Plant nutrition Tags: None