Annual Wheat Newsletter. Volume 64

The Annual Wheat Newsletter is edited by W.J. Raupp and published by the Wheat Genetic and Genomic Resources Center at Kansas State University. The scope of the Newsletter includes current project activities, cultivar releases, special reports, and publications of wheat researchers worldwide. The Newsletter annually has over 100 contributors from more than 30 countries

Die Wirkung von Düngerart und Düngermenge auf die Partitionierung von Kohlenstoff und Stickstoff in Pools mit unterschiedlichem Umsatz

Type and rate of fertilizer influence the level of organic carbon and total nitrogen in the soil markedly, but the effect on different pools is open to question. Soil samples were taken from a sandy Cambisol at Darmstadt, Germany, after 27 years of different fertilization treatments. The six treatments were: straw incorporation plus application of mineral fertilizer (MSI) and application of farmyard manure (FYM) each at high (140 – 150 kg N ha-1 year-1), medium (100 kg N ha-1 year-1) and low (50 – 60 kg N ha-1 year-1) rates. After 266 days of incubation (10°C, 50% water-filled pore space) mineralization of C (1130 – 1820 kg ha-1) and N (90 – 125 kg ha-1) depended on the rate and not on the type of fertilizer. Very labile and labile pools were obtained by fitting a two-pool model on the mineralization data. The very labile pool (turnover: 17 days, C/N ratio: 23) was unaffected by treatments. Storage of C (1.8 – 3.2 t ha-1) in the labile pool (turnover 462 days, C/N ratio: 22) increased significantly with the rate of fertilizer. The size of the intermediate pool was significantly higher in FYM (15 -18 t ha-1) than in MSI treatments (12- 14 t ha-1). A passive pool, obtained by oxidation with Na2S2O8, was independent of treatments. Our study shows that labile and intermediate pools were affected differently by fertilization

Ertrag und Wurzelkolonisation mit arbuskulären Mykorrhiza- Pilzen von organisch oder mineralisch gedüngtem Weizen auf trockenem, sandigen Boden

We investigated wheat yield and arbuscular mycorrhiza (AM) fungal root colonization and spore formation in response to fertilization, either with high or low amounts of mineral fertilizer or cattle manure since 27 years. At low rates there was no difference in yield between minerally and organically fertilized plants. High rates of mineral fertilizers reduced yields. Reasons can be that either the high nitrogen availability was less effectively used for grain development of minerally fertilized plants, or the mineral fertilization rendered the plants more sensitive towards drought stress. The extent of AM fungal root colonization appeared to depend on the plant P nutritional status rather than the type of fertilizer applied. The lower fertilization showed higher rates of AM root colonization. The number of AM spores, however, was higher in organically compared with minerally fertilized soil, indicating that organic fertilization increased reproduction of these beneficial microbes under dry soil conditions

Annual Wheat Newsletter. Volume 61

The Annual Wheat Newsletter is edited by W.J. Raupp and published by the Wheat Genetic and Genomic Resources Center at Kansas State University. The scope of the Newsletter includes current project activities, cultivar releases, special reports, and publications of wheat researchers worldwide. The Newsletter annually has over 100 contributors from more than 30 countries

Annual Wheat Newsletter. Volume 61

The Annual Wheat Newsletter is edited by W.J. Raupp and published by the Wheat Genetic and Genomic Resources Center at Kansas State University. The scope of the Newsletter includes current project activities, cultivar releases, special reports, and publications of wheat researchers worldwide. The Newsletter annually has over 100 contributors from more than 30 countries

Annual Wheat Newsletter. Volume 56

The Annual Wheat Newsletter is edited by W.J. Raupp and published by the Wheat Genetic and Genomic Resources Center at Kansas State University. The scope of the Newsletter includes current project activities, cultivar releases, special reports, and publications of wheat researchers worldwide. The Newsletter annually has over 100 contributors from more than 30 countries

Yield and arbuscular myccorhiza fungal root colonization of organically or minerally fertilized wheat grown on a dry, sandy soil

We investigated wheat yield and arbuscular mycorrhiza (AM) fungal root colonization and spore formation in response to long-term mineral or organic soil fertilization. Plots were either fertilized with high or low amounts of mineral fertilizer or cattle manure since 27 years. At low fertilization levels there was no difference in yield between minerally and organically fertilized plants. High levels of mineral fertilizer application reduced wheat yields. Probable reasons can be that either the high nitrogen availability was less effectively used for grain development of minerally fertilized plants, or the mineral fertilization rendered the plants more sensitive towards drought stress. The extent of AM fungal root colonization appeared to depend on the plant P nutritional status rather than the type of fertilizer applied. The low fertilization treatments showed higher rates of AM root colonization. The number of AM spores, however, was higher in organically compared with minerally fertilized soil, indicating that organic fertilization increased reproduction of these beneficial microbes under dry soil conditions

Annual Wheat Newsletter. Volume 62

The Annual Wheat Newsletter is edited by W.J. Raupp and published by the Wheat Genetic and Genomic Resources Center at Kansas State University. The scope of the Newsletter includes current project activities, cultivar releases, special reports, and publications of wheat researchers worldwide. The Newsletter annually has over 100 contributors from more than 30 countries

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The Annual Wheat Newsletter is edited by W.J. Raupp and published by the Wheat Genetic and Genomic Resources Center at Kansas State University. The scope of the Newsletter includes current project activities, cultivar releases, special reports, and publications of wheat researchers worldwide. The Newsletter annually has over 100 contributors from more than 30 countries

Annual Wheat Newsletter. Volume 63

The Annual Wheat Newsletter is edited by W.J. Raupp and published by the Wheat Genetic and Genomic Resources Center at Kansas State University. The scope of the Newsletter includes current project activities, cultivar releases, special reports, and publications of wheat researchers worldwide. The Newsletter annually has over 100 contributors from more than 30 countries