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2007, vol. 23, br. 5-6-2, str. 383-388
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Uticaj faze razvitka na hemijski sastav lista i stabla lucerke
The effect of development stage on chemical composition of alfalfa leaf and stem
Sažetak
Ispitivan je sadržaj sirovih proteina i konstituenata ćelijskog zida u listu i stablu lucerke (Medicago sativa L.) cv K - 22 u zavisnosti od fenofaze razvitka. Uzorkovanje je obavljeno u sedmodnevnim intervalima u drugom otkosu. Sa porastom i razvitkom, sadržaj sirovih proteina se smanjuje, u listu od 332,6 do 328,8gkg-1SM, a u stablu od 138,6 do 122,0gkg-1SM. Od prve do treće faze razvitka sadržaj NDF se povećao, u listu od 352,0 do 476,7gkg- 1SM, a u stablu od 592,8 do 867,1gkg-1SM. Najveći sadržaj ADF i hemiceluloze je takođe u trećoj fazi razvitka, u listu 187,4 i 289,3gkg-1SM, a u stablu 499,4 i 367,7gkg-1SM. Promene u sadržaju lignina su najveće u stablu, dok se u listu sadržaj lignina povećao od 42,0 do 49,0gkg-1SM.
Abstract
Content of crude protein and cell wall constituents in leaves and stems of alfalfa (Medicago sativa L.) cv K-22 with advancing maturity was investigated. Sampling was done in 7-day intervals in second cut. During growth and development, crude protein content decreased in leaves and stems, from 332,6 to 328,8 gkg-1DM and from 138,6 to 122,0 gkg-1DM, respectively. From first to third development stage, content of ADF in leaves and stems increased, from 352,0 to 476,7 gkg-1DM and from 592,8 to 867,1 gkg-1DM, respectively. Highest contents of ADF and hemicellulose was stated in plant parts in third development stage, in leaves 187,4 and 289,3 gkg-1DM, and in stems 499,4 and 367,7 gkg-1DM. The highest changes of lignin contents are in stems, while content of lignin in leaves increased from 42,0 to 49,0 gkg-1DM.
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