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Archive for December, 2007

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

Strategies for Soil Recovery of Degraded Lands under Arid Climate

Draft. In: Biogeochemistry and sustainable management. WeberV 2007 1. Abstract Human activities have often led to degradation of the world’s land resources. The global assessment of human-induced soil degradation (GLASOD) has shown that degradation results mainly from erosion and salinization, which are discussed in this review. Land conservation and rehabilitation of deserted or saline land are [...]

December 4th, 2007
Topic: Crop Science, Plant biodiversity Tags: None