White clover as a source of nitrogen on Estonian grasslands on acid soils poor in humus
1995
Kaerner, M. | Kaerner, E. (Estonian Agricultural Univ., Tartu (Estonia))
There is little experimental evidence on the efficiency and N-fixing ability of white clover grown with various grasses on acid soils low in humus. The experiment was conducted on a moderately podzolic loamy sand with an initial pHkcl value of 4.4, with humus and N contents of 1.56-1.89 per cent and 0.08-0.10 per cent, respectively. The experiment included the following species of grasses: timothy (Phleum pratense L.) Jogeva 54, meadow fescue (Festuca pratensis L.) Jogeva 47, cocksfoot (Dactylis glomerate L.) Jogeva 220, red fescue (Festuca rubra L.) Jogeva 70, smooth-stalked meadow grass (Poa pratensis L) Jogeva 1 and white clover (Trifolium repens L.) Jogeva 4. These grasses were grown as pure species and in mixture with white clover. The experiment was conducted over a 7-year period. Paper is concerned with results of 2 to 7 growth years because the yields of first year were very low
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