Utjecaj gnojidbe na probavljivost, sadržaj sirovih proteina i metaboličke energije krme s poluprirodnog pašnjaka

master's thesis

• Author: Mihaela Turković
• Mentor: Krešimir Bošnjak (mentor)
• Committee member: Krešimir Bošnjak (predsjednik povjerenstva)
• Committee member: Marina Vranić (član povjerenstva)
• Committee member: Goran Kiš (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Department of Field Crops, Forage and Grassland); Zagreb
• Defense date and country: 2017-04-04, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Cilj ovog rada bio je utvrditi utjecaj gnojidbe dušikom (N) na probavljivost, sadržaj sirovih
proteina i metaboličke energije krme na poluprirodnom travnjaku. Tijekom tri godine (2002.,
2003. i 2004 godine) na pokusnom pašnjaku „Centra za travnjaštvo“ Agronomskog fakulteta
u Zagrebu provedeno je istraživanje na poluprirodnom travnjaku, u uvjetima rotacijskog
napasivanja ovcama. Istraživan je utjecaj gnojidbe dušikom u količinama od 35 kg ha-1 god-1
dušika (N35), 100 kg ha-1 god-1 dušika (N100) i 150 kg ha-1 god-1 dušika (N150) na
produktivnost pašnjaka i hranjivost dostupne biljne mase. Rezultati istraživanja pokazali su
utjecaj ekstenzivnijih mjera gospodarenja pašnjakom na promjenu hranidbene vrijednosti
dostupne krme. Utjecaj primjene N na hranidbenu vrijednost dostupne mase utvrđen je samo
u smanjenom sadržaju sirovih bjelančevina (SB) kod gnojidbe sa 35 kg N ha-1 god-1 u
usporedi s višim količinama primijenjenog N. Probavljivost organske tvari (OT) krme
pokazala se najvećom kod primjene 100 kg N ha-1 god-1 gdje je iznosila 734,9 g kg-1 ST.
Najveća probavljivost OT krme utvrđena je tijekom vegetacijske sezone 2003. godine (757,3
g kg-1 ST), dok je u 2002. i 2004. probavljivost OT iznosila 702,3 i 741,6 g kg-1 ST,
respektivno. Sadržaj metaboličke energije (ME) nije se značajno mijenjao kod različitih
količina N gnojidbe, kao ni s obzirom na vegetacijsku sezonu uzgoja. Unatoč tome, najveći
sadržaj ME utvrđen je kod gnojidbe sa 100 kg N ha-1 god-1 (10 MJ kg-1 ST), te u vegetacijskoj
sezoni 2003. godine (10,3 MJ kg-1 ST).

Abstract (english)

The aim of this study was to determine the effect of nitrogen (N) fertilization on digestibility,
crude protein and metabolic energy content in feed on semi-natural grasslands. Over the
course of three years (2002, 2003 and 2004) a research was conducted on the Zagreb Faculty
of Agriculture's "Center of Grassland" experimental pasture, on semi-natural grassland that
was rotary grazed with sheep. The subject of study was the effect of nitrogen fertilization in
quantities of 35 kg ha-1 yr-1 of nitrogen (N35), 100 kg ha-1 yr-1 of nitrogen (N100) and 150 kg
ha-1 yr-1 of nitrogen (N150) on the productivity of pastures and nutritional values of available
plant mass. The study results showed the effect that the more extensive pasture management
measures had on the nutritional value of the available feed. The impact of the application of N
on the nutritional value of available mass was found only in the reduced content of crude
protein (CP) in fertilization with 35 kg N ha-1 yr-1 in comparison with higher levels of applied
N. The digestibility of organic matter (OM) of the feed proved to be the highest in the
application of 100 kg N ha-1 yr-1, where it amounted to 734.9 g kg-1 DM. The highest
digestibility of the feed's OM was found during the growing season in 2003 (757.3 g kg-1
DM), while in 2002 and 2004, the digestibility of the OM was 702.3 and 741.6 g kg-1 DM
respectively. The metabolized energy (ME) content was neither significantly changed by
different amounts of N fertilization, nor with respect to the vegetation growing season.
Nevertheless, the highest content of ME was determined in fertilization with 100 kg N ha-1 yr-
1 (10 MJ kg-1 DM), and in the growing season in 2003 (10.3 MJ kg-1 DM).

• Keywords: gnojidba dušikom; poluprirodni travnjak; sirove bjelančevine; probavljivost organske tvari; metabolička energija
• Keywords (english): nitrogen fertilization; semi-natural grassland; crude protein; organic matter digestibility; metabolized energy
• Language: croatian
• URN:NBN: urn:nbn:hr:204:920608
• Study programme: Title: Plant Sciences; Study programme type: university; Study level: graduate; Academic / professional title: magistar / magistra inženjer/inženjerka biljnih znanosti (magistar / magistra inženjer/inženjerka biljnih znanosti)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-07-17 07:49:01