20.500.12556/DKUM-38981 Akumulacija in simbiotska vezava dušika z metuljnicami za prezimno ozelenitev tal Nitrogen accumulation and symbiotic fixation with winter legume cover crops V dveh ločenih obdobjih (2004/2005 in 2005/2006) smo v SV Slovenji v eksaktnih poljskih poskusih (naključni bloki v štirih ponovitvah) proučevali vpliv roka setve (SD1 – sredina avgusta; SD2 – sredina septembra in SD3 – sredina oktobra) prezimnih metuljnic: podzemne detelje (Trifolium subterraneum), inkarnatke (Trifolium incarnatum), črne detelje (Trifolium pratense) in ozimne grašice (Vicia villosa) na pridelek suhe snovi rastlin (SS), količino akumuliranega (AN) in simbiotsko vezanega (Nsimb) dušika, ter na količino mineralnega (Nmin) dušika v tleh. Kontrolno obravnavanje je bila mnogocvetna ljuljka (Lolium multiflorum). V povprečju smo do konca jeseni v SD1 dosegli od 915 (podzemna detelja) do 2495 kg SS ha-1 (ozimna grašica), od 52,3 (črna detelja) do 148 kg AN ha-1 (inkarnatka) in od 14,5 (črna detelja) do 114,5 kg Nsimb ha-1 (inkarnatka). Po prezimitvi do zaoravanja pa v SD1 od 1065 (podzemna detelja) do 4444 kg SS ha-1 (inkarnatka), od 74,9 (podzemna detelja) do 193 kg AN ha-1 (ozimna grašica) in od 4,7 (podzemna detelja) do 179 kg Nsimb ha-1 (ozimna grašica). Količine vseh izmerjenih parametrov za SD2 so signifikantno nižje od SD1, SD3 pa za metuljnice ni bil več primeren. Učinkovito simbiotsko vezavo dušika z metuljnicami v jeseni lahko pričakujemo le ob dovolj rani setvi, medtem ko so količine Nmin v tleh pozno v jeseni in zgodaj spomladi signifikantno nižje pod mnogocvetno ljuljko, kot pa pod metuljnicami. In two separate experimental periods (2004/2005 and 2005/2006) carried out in NE Slovenia in exact field trials (randomised block with four replicates), we investigated the influence of sowing date (SD1 – in mid August, SD2 – in mid September and SD3 – in mid October) on winter legumes (Trifolium subterraneum, Trifolium incarnatum, Trifolium pratense and Vicia villosa) on dry matter yield and soil N cycling. The control treatment was Lolium multiflorum. In the case of the legume cover crops in SD1 we documented from 915 (T. subterraneum) to 2495 kg of herbage dry matter yield (HDMY) ha-1 (V. villosa), 52.3 (T. pratense) to 148.4 kg of accumulated nitrogen (AN) ha-1 (T. incarnatum), and 14.5 (T. pratense) to 114.5 kg of symbiotically fixed nitrogen (Nsymb) ha-1 (T. incarnatum) up to the end of autumn. Until the spring ploughing-in, the legume cover crops in SD1 yielded 1065 (T. subterraneum) to 4440 kg HDMY ha-1 (T. incarnatum), 74.9 (T. subterraneum) to 193 kg AN ha-1 (V. villosa), and 4,7 (T. subterraneum) to 179 kg Nsymb ha-1 (V. villosa). The amounts of all measured parameters in SD2 were significantly lower than in SD1, whereas the SD3 sowing was not found appropriate for the legumes. The ecological benefits of legume winter cover crops related to symbiotic nitrogen fixation were achieved only by early sowing; however, the amount of soil mineral N in late autumn and in early spring was significantly lower under L. multiflorum than under the legumes. metuljnice akumulacija dušika simbiotska vezava dušika čas setve prezimni dosevki legumes nitrogen accumulation nitrogen fixation sowing date winter cover crops true true false Slovenski jezik Angleški jezik Doktorska disertacija 2012-11-15 12:02:59 2012-11-30 14:56:17 2022-05-04 13:54:59 2021-04-21 03:11:55 2012 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 URN:SI:UM:DK:OTRDDWUF DR_Gselman_Anastazija_2012.pdf DR_Gselman_Anastazija_2012.pdf 1 56C60C176EE78DEE7F41EBF60365D71A 2a97ad4f2a1452be5de70e208882cf7bf529096b09a6c32efd8bbaf88ea67d10 9ac519e6-7c08-11eb-bb7a-00155d0001ca 20.500.12556/dkum/78ba7411-5e76-4259-aed0-0bce0ec7e319 https://dk.um.si/Dokument.php?lang=slv&id=52407 Fakulteta za kmetijstvo in biosistemske vede 0 0 0