Studies on nitrogen accumulation, fiber chemistry, and in vitro digestibility of alfalfa

Albrecht, Kenneth A.

doi:10.31274/rtd-180813-8554

Cited by 3 publications

(4 citation statements)

References 87 publications

(133 reference statements)

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“…Slabo prenaša prekomerno vlažnost tal, pomanjkanje glavnih mineralnih hranil in kisla tla (< pH 6). V primerjavi s črno deteljo se njena hranilna vrednost v smislu prebavljivosti in vsebnosti vlaknine znatno hitreje slabša s časom rasti in zorenjem, kar je posledica povečane lignifikacije stebel (Kühbauch in Pletl, 1981;Kühbauch in Voigtländer, 1981;Albrecht, 1983). Siliranje lucerne je v primerjavi s travami zahtevnejše zaradi njene večje puferske kapacitete in manjše vsebnosti vodotopnih ogljikovih hidratov (Rizk, 2004;Verbič in Verbič, 2017).…”

Section: Uvodunclassified

“…Negativni vpliv suše se je odrazil na masi in velikosti stebel, kar je dobro poznano (Fick in sod., 1988). Zasenčenost sestoja lucerne povzroči staranje in odpadanje listov na spodnjih delih poganjkov (Albrecht, 1983;Fick in sod., 1988). Pri lucerni v našem poskusu se je to odpadanje v večji meri začelo po 42. dnevu rasti.…”

Section: čAsovni Potek Pridelkaunclassified

“…V tem času je lucerna začela cveteti, razen v C1, ko je cvetenje nastopilo šele proti koncu ciklusa. Hitrejša rast lucerne pred cvetenjem kot po njem je dobro poznana in se odraža tudi v največjem letnem pridelku pri košnji, ko ima od 10 do 50 % poganjkov cvetove (Albrecht, 1983). Primerjava časovnih potekov povečevanja pridelka zelinja v tej raziskavi z drugimi je težavna zaradi metodoloških razlik pri izvajanju poskusov in številu vključenih ciklusov.…”

Section: čAsovni Potek Pridelkaunclassified

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Herbage Yield, Morphological Development and Nutritive Value of Lucerne During Growth Season in Central Slovenia: Analysis of Time Patterns

Čop

Košmelj

Žnidaršič

et al. 2018

AAS

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IZVLEČEKČas košnje je zelo pomemben dejavnik količine in kakovosti pridelka krme enovrstnih koševin. Zato smo želeli analizirati časovne poteke pridelka zelinja, morfološkega razvoja in parametrov kakovosti lucerne med rastno sezono ter jih povezati s časom košnje. Poljski poskus v split-plot zasnovi z dvema blokoma smo izvedli v Ljubljani leta 2016. Glavne parcele so predstavljale 4 rastne cikluse (C1-C4), podparcele pa 9 tedenskih terminov za merjenje pridelka in vzorčenje zelinja. Rast lucerne je bila v prvi polovici rastne sezone boljša kot v drugi. Pridelek zelinja je v zadnjih dveh ciklusih hitro dosegel maksimum in se nato zmanjševal. Statistična analiza je pokazala, da so linearni regresijski modeli primerni za opisovanje časovnih potekov naslednjih spremenljivk: morfološkega razvoja (PRF), surovih beljakovin (SB), vlaken, netopnih v nevtralnem detergentu (NDV) in neto energije za laktacijo (NEL). Morfološki razvoj lucerne je bil hitrejši poleti kot pomladi ali jeseni, vendar je po tej lastnosti med ciklusi izrazito odstopal samo prvi. Kakovost lucerne je bila predvsem zaradi počasnejšega razvoja v celoti najboljša v C1, kar se je bolj odrazilo pri NDV in NEL kot pri SB. C1 je bil po kakovosti lucerne enakovreden samo C4 na začetku rasti. Upoštevajoč pridelek in vsebnost NEL je bila optimalna starost lucerne ob košnji od 28 do 35 dni spomladi in poleti ter od 35 do 42 dni jeseni.Ključne besede: lucerna; pridelek; morfološki razvoj; hranilna vrednost; časovni potek ABSTRACT HERBAGE YIELD, MORPHOLOGICAL DEVELOPMENT AND NUTRITIVE VALUE OF LUCERNE DURING GROWTH SEASON IN CENTRAL SLOVENIA: ANALYSIS OF TIME PATTERNSCutting time is a pivotal factor affecting herbage yield and nutritive value of forage crop monocultures. Therefore, our objectives in this lucerne study were to analyse temporal patterns of herbage yield, morphological development and quality parameters over growth season, and to relate these patterns to the time of cutting. A field experiment in split-plot design with two block replications was conducted in Ljubljana in 2016. Four growth cycles (C1-C4) were assigned to the main plots, and nine weekly intervals at which herbage yield was measured and herbage samples taken were assigned to the sub-plots. Dry-matter herbage yield accumulated faster during the first half of the season than during the second one. It peaked early in each of the last two growth cycles and after that started to decrease. Statistical analysis showed that linear regression models are acceptable to describe time patterns of morphological development stages (MSW) and contents of crude protein (CP), neutral detergent fibre (NDF) and net energy for lactation (NEL). MSW increased faster during the summer than during the spring or autumn, but only C1 was distinct in this pattern. Lucerne forage quality was generally the highest in C1 mainly due to slower morphological development. This high quality reflected more in NDF and NEL than in CP. In respect of the quality, only C4 at the beginning of the growth was equivalent to C1. Cons...

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Section: Uvodunclassified

Section: čAsovni Potek Pridelkaunclassified

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Herbage Yield, Morphological Development and Nutritive Value of Lucerne During Growth Season in Central Slovenia: Analysis of Time Patterns

Čop

Košmelj

Žnidaršič

et al. 2018

AAS

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“…They reported that the in vivo digestibility of the bottom portion of the canopy was 10 percentage units lower than the tops and declined with time while the digestibility of the tops remained constant. The digestibility of alfalfa leaves declines only slightly as the plant matures (Terry and Tilley, 1964;Mowat et al, 1965;Albrecht, 1983;Wilman and Altimimi, 1984;Buxton et al, 1985). Mowat et al (1965) observed that the digestibility of alfalfa stems early in the season was as high as that of the leaves, but that the stems declined rapidly as the plant matured.…”

Section: Alfalfa Plant Partsmentioning

confidence: 99%

Yield dynamics and chemical composition of canopy components in alfalfa-grass associations

Mooso

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Post Weaning Supplementation of April-Born Polypay and White Dorper Lambs Grazing Alfalfa/Orchardgrass Pasture

Wood

2016

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Studies on nitrogen accumulation, fiber chemistry, and in vitro digestibility of alfalfa

Cited by 3 publications

References 87 publications

Herbage Yield, Morphological Development and Nutritive Value of Lucerne During Growth Season in Central Slovenia: Analysis of Time Patterns

Herbage Yield, Morphological Development and Nutritive Value of Lucerne During Growth Season in Central Slovenia: Analysis of Time Patterns

Yield dynamics and chemical composition of canopy components in alfalfa-grass associations

Post Weaning Supplementation of April-Born Polypay and White Dorper Lambs Grazing Alfalfa/Orchardgrass Pasture

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