20.500.12556/DKUM-12665 Vpliv dolgoletne različne pogostnosti košnje na pridelek in rastlinsko sestavo polnaravnega travnika The impact of various cutting frequencies on the yield and botanical composition of semi-natural grassland V letih od 2004 do 2008 smo v Pivoli (46°28'16''S, 15°38'20''V, 300 m n.v.) ugotavljali vpliv dolgoletne spremenjene pogostnosti košnje (od leta 1995) na pridelek in rastlinsko sestavo polnaravnega travnika, v izhodišcu združbe Ranunculo repentis — Alopecuretum pratensis. Obravnavanja v mikroposkusu (nakljucni blok v štirih ponovitvah) so bila 2-, 4-, 6-, 8-, 10- in 12-tedenski interval med posameznimi košnjami, ob gnojenju 170 kg N dušik), 120 kg P2O5 (fosforjev pentoksid), in 180 kg K2O kalijev oksid) na hektar letno. Najvišji povprecni pridelek suhe snovi v petletnem obdobju smo dosegli pri 8-tedenskem intervalu med košnjami (10,6 t/ha/leto, štiri košnje letno) in najnižji pri 2-tedenskem intervalu (5,94 t/ha/leto, štirinajst do šestnajst košenj letno). Najvišji hektarski pridelek SB v letu 2008 (1530 kg) je bil pri 4-tedenskem intervalu (sedem do osem košenj letno) in najnižji (874 kg) pri 12-tedenskem intervalu (dve košnji letno). Najvišji hektarski pridelek NEL (50650 MJ) smo dosegli pri intervalu košnje na osem tednov (štiri košnje letno) in najnižj (38370 MJ) pri zelo pogostni rabi ob intervalu košenj na dva tedna in letno opravljenih štirinajst do šestnajst košenj. Tako število posameznih rastlinskih vrst kot Shanonov indeks rastlinske pestrosti sta bila ob koncu raziskave najvišja pri 6-tedenskem intervalu med košnjami. Tako po kolicini in kakovosti krme kot z vidika rastlinske pestrosti je najugodnejši nacin kosne rabe dane rastlinske združbe pri danem gnojenju 6- do 8-tedenski interval med košnjami (štiri do pet košenj letno), s tem da je tak dolgoleten nacin rabe zelo spremenil rastlinsko sestavo izhodišcne združbe. In the years from 2004 to 2008 in Pivola (46°28'16''N, 15°38'20''E, 300 m a.s.l.) we studied the impact of various cutting frequencies (since 1995) on the yield and botanical composition of semi-natural grassland of Ranunculo repentis - Alopecuretum pratensis alliance at the start of our experiment. The treatments in the microtrial (random block design with four replications) included 2-, 4-, 6-, 8-, 10- and 12-week interval between cuts and fertilization with 170 kg N (nitrogen), 120 kg P2O5 (phosphorus pentoxide)and 180 kg K2O (potassium oxide)/ha per year. The highest average DM yield in the five-year period was achieved by an 8-week interval betwen cuts (10,6 t/ha/year, four cuts per year) and the lowest by a 2-week interval (5,94 t/ha/year, 14 to 16 cuts per year). The highest yield per hectare of CP 2008 (1530 kg) resulted from the 4-week interval (seven - to eight cuts per year) and the lowest (874 kg) from the 12-week interval (two cuts per year). The highest yield per hectare of NEL (50650 MJ) was achieved by an 8-week interval between cuts (four cuts per year) and the lowest (38370 MJ) by a 2-week interval and 14 to 16 cuts per year. Thus both the number of individual plant species as well as the Shannon plant diversity index were the highest at the end of our study in a 6-week interval between cuts. It was established that the most favourable cutting regime from the point of view of quantity and quality of feed as well as in terms of plant diversity is a 6- to 8-week interval between cuts (4 to 5 cuts per year) combined with the above stated fertilising by taking into consideration that the exploitation of this grassland over several years affected significantly the initial botanical composition. polnaravno travinje pogostnost košnje pridelek rastlinska sestava semi-natural grassland cutting frequency yield botanical composition true true false Slovenski jezik Angleški jezik Magistrsko delo 2009-12-08 15:16:03 2009-12-22 12:07:34 2022-04-12 07:41:36 2022-04-20 03:09:31 2009 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 URN:SI:UM:DK:FDX3EG6Q MAG_Podvrsnik_Miran_2009.pdf MAG_Podvrsnik_Miran_2009.pdf 1 B2E6BDC7622C7B256F0CE402B40D9DCE 856370da602062dd855d6d517cd44ac8399746c5efab61b85a38f560cbb2f6e6 b68918e4-7c03-11eb-bb7a-00155d0001ca 20.500.12556/dkum/fb2a00e8-e8d4-4d8a-8096-937ed42d9890 https://dk.um.si/Dokument.php?lang=slv&id=12324 Fakulteta za kmetijstvo in biosistemske vede 0 0 0