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Gewählte Master / Diploma Thesis:

Anne-Kathrin Schäfer (2013): Biomasseentwicklung, Ertragsstruktur und Stickstoffdynamik in Weizen-Erbsen-Gemengen.
Master / Diploma Thesis - Abteilung Pflanzenbau, BOKU-Universität für Bodenkultur, pp 59. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
Some properties of intercrops may bring distinct advantages over pure stands. The legume in the cereal-legume-mix preserves the nitrogen content in the soil solution due to its symbiotic fixation of atmospheric N2 and low demand for inorganic nitrogen fertilization. The cereal reduces the nitrogen content in the soil solution leading to a higher N-fixing performance of pea. Hence the supply of soil and atmospheric nitrogen is used more efficiently in the mixed culture. In addition high or higher yields, better yield stability as well as quality in comparison to monoculture due to nutrient mobilization, improved nutrient supply for mixture partners and more efficient use of the growth factors light and water can be expected. The aim of this master thesis was to measure the influence of varying mixing proportions and different sowing dates on vegetative soil cover, shoot biomass, yield, yield structure, Nmin-content in the soil as well as N-content in biomass, and N uptake in grain and straw. The soil cover was highest in the pure wheat stands. It decreased with decreasing wheat and increasing pea proportions in the mixtures. The mixture with the biggest wheat portion planted in spring attained very quickly complete soil cover. In all mixtures wheat dominated in grain yield and shoot biomass beyond its original seeding rate and suppressed pea. Pea had substantially lower grain yields and surface biomass than expected based on its pure stand yields and its seeding rates in the mixtures. In mixtures with lower wheat portions wheat could use the increasing space per single plant by a higher number of grains per spike. The yield components of pea decreased with increasing wheat portions in the mixtures. The Nmin-content in the soil decreased in all treatments up to harvest. But the decrease was faster with less pea and higher wheat shares. The N yield of both crops increase with increasing proportion in the mixture. The protein content in pea grain seemed not be affected in the mixtures compared to pure stands. However, wheat has the tendency to store higher protein contents in grain with a higher pea share in the mixture.

Beurteilende(r): Kaul Hans-Peter
1.Mitwirkender: Neugschwandtner Reinhard

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