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Peculiarities of overwintering of hybrid and conventional cultivars of winter rapeseed depending on the sowing date

100%

Velicka R., Pupaliene R., Butkeviciene L. M., Kriauciuniene Z.

Acta Scientiarum Polonorum. Agricultura

2012

tom 11

nr 1

Field experiment on different sowing dates of two winter rapeseed cultivars (Brassica napus L. spp. and oleifera biennis Metzg.) was carried out in years 2009-2010 at the Experimental Station of the Aleksandras Stulginskis University (54°53’ N; 23°50’ E). The objective of the study was to evaluate the effect of winter rapeseed sowing date on the biometric parameters of rapeseed rosette: number of leaves, root collar diameter, height of apical bud, and its chemical composition: N:K ratio, amount of dry matter, total sugar in autumn before wintering, changes of chemical composition during the autumnwinter period, and overwintering. Sowing date significantly influenced all the examined indexes. According to the biometric parameters, the chemical composition of leaves, and the apical bud, winter rapeseed sown between August 30th and September 5th was best prepared for wintering and overwintered. Growth during the period of preparation for overwintering was more intensive. Changes in the chemical composition during the overwintering period were more favourable and the overwintering of winter rapeseed was better in the hybrid cultivar Kronos compared with cultivar Sunday.

Allelopathic effect of organic mulches on vegetable germination and early development

88%

Judaugiene D., Sinkeviciene A., Pupaliene R., Ninkovic V., Kriauciuniene Z.

Acta Scientiarum Polonorum. Hortorum Cultus

2018

tom 17

nr 3

Plants, as well as their residues (mulches), release physiologically active substances (allelochemicals), which may affect plant germination, development, and productivity. In this study we investigated the allelopathic effects of aqueous extracts of organic mulches (winter wheat straw, peat, sawdust, and gramineous grass) at different concentrations on germination and early growth of radish (Raphanus sativus L.), carrot (Daucus sativus Röhl.), and lettuce (Lactuca sativa L.). It was found, that the strongest negative effect on the germination and shoot and root development of investigated vegetables was with the highest concentration (1 : 10) of the grass aqueous extract. Peat mulch aqueous extracts had the least negative impact on all vegetable seed germination. Straw and peat mulches stimulated the early growth of R. sativus shoots, but there was a negative affect on D. sativus shoot development. The aqueous extracts of various organic mulches had negative effects on R. sativus, while mostly positive effects found on L. sativa root development.

Ograniczanie wyników

1 Acta Scientiarum Polonorum. Agricultura

1 Acta Scientiarum Polonorum. Hortorum Cultus

2 Kriauciuniene Z.

2 Pupaliene R.

1 Butkeviciene L. M.

1 Judaugiene D.

1 Ninkovic V.

1 Sinkeviciene A.

1 Velicka R.

1 2018

1 2012

Wyniki wyszukiwania

Peculiarities of overwintering of hybrid and conventional cultivars of winter rapeseed depending on the sowing date

Allelopathic effect of organic mulches on vegetable germination and early development