Variability in manganese content in different grass species and red clover | Variabilnost v vsebnosti mangana v vzorcih trav in črne detelje

anglais. In 1997 on 7 different plots of the same ground in four periods and in different stages of growth in each period 10 samples of red clover (Trifolium pratense) and Italian rygrass (Lolium multiflorum) and 8 samples of timothy (Phleum pratense), perennial rygrass (Lollium perenne), meadow fescue (Festuca pratensis), red fescue (Festuca rubra) and orchardgrass (Dactylis glomerata) were collected. Differences in manganese content have been found among different species grown and cut at the same site. The concentration of manganese in dry matter was the highest in orchardgrass samples (215.3 ± 54.9 mg kg-1 DM) and lower in red fescue (55.7 ± 7.8 mg kg-1 DM). Other grasses and red clover contained significantly less manganese (33.1 mg to 42.0 mg kg-1 DM). In grasses with low manganese contents and in red clover samples from the first cut the manganese concentrations were significantly higher in the vegetative shoot (25.2 mg to 61.6 mg kg-1 DM) than in the reproductive shoot (16.6 mg to 47.8 mg kg-1 DM). In the samples of orchardgrass the manganese concentration in the first cut raised with the stage of grass maturity (from 145.5 mg to 179.5 mg kg-1 DM). The lowest average manganese concentration in dry matter was found in all grass species and in red clover in samples from the first cut (21.0 mg to 53.0 mg kg-1 DM) and the highest in autumn samples (42.2 mg to 68.7 mg kg-1 DM) with exception of orchardgrass with the lowest value in the first cut (160.0 mg kg-1 DM) where the highest manganese concentration was attained in the second cut samples (272.0 mg kg-1 DM) with lower values in summer (209.6 mg kg-1 DM) and in autumn cut (215.4 mg kg-1 DM).

slovène. V letu 1997 smo na različnih parcelah iste površine v štirih košnjah in v različnih razvojnih fazah rastlin zbrali po 10 vzorcev črne detelje (Trifolium pratense) in mnogocvetne ljuljke (Lolium multiflorum) ter po 8 vzorcev mačjega repa (Phleum pratense), trpežne ljuljke (Lolium perenne), travniške bilnice (Festuca pratensis), rdeče bilnice (Festuca rubra) in pasje trave (Dactylis glomerata). Največjo povprečno vsebnost mangana v suhi snovi smo ugotovili v vzorcih pasje trave (215,3 ± 54,9 mg kg-1 SS) in v vzorcih rdeče bilnice (55,7 ± 7,8 mg kg-1 SS). Druge trave in črna detelja so vsebovale statistično značilno manj mangana v suhi snovi (od 33,1 mg do 42,0 mg kg-1 SS). Pri travah z manjšo vsebnostjo mangana in pri črni detelji je bila ob prvi košnji vsebnost mangana največja v fazi bilčenja (25,2 mg do 61,6 mg kg-1 SS) in najmanjša v fazi cvetenja (16,6 mg do 47,8 mg kg-1 SS). Pri pasji travi pa je vsebnost mangana v suhi snovi z zorenjem rastline v prvi košnji naraščala (od 145,5 mg na 179,5 mg kg-1 SS). Najmanjša povprečna koncentracija mangana je bila pri vseh travah in pri črni detelji v vzorcih prve košnje (od 21,0 mg do 53,0 mg kg-1 SS) in največja jeseni ob četrti košnji (od 42,2 mg do 68,7 mg kg-1 SS), pri pasji travi pa je bila ob prvi košnji 160 mg, ob drugi 272,0 mg in se je v tretji in četrti košnji zmanjšala na 209,6 mg oziroma 215,4 mg kg-1 SS.