Published in Scientific Papers. Series A. Agronomy, Vol. LVII
Written by Nicolaie IONESCU, Sorin Gabriel IONESCU
Weed Raphanus raphanistrum L. (RAPRA in code Bayer) is one of the important species in the white luvicsoils. Populations from cultivated surfaces have high competitive capacity through: high density and rapid rate of growth. Because of this, obviously affected crops, giving large losses, dangerous. The plant grows in both winter crops, as well as the spring. In the biological cycle, weed blooms in May for the spring generation and September to autumn generation. Biodiversity study was done on analyzing plant flowers two aspects: lamina petals color and lamina vines color. The data obtained were the dominant colors: yellow-white base, pale yellow and bright yellow, with different percentages depending on the ecosystem studied: wheat in May, the field before spring sowing, and autumn generation weed in September (new field plowed). From time to time were determined plants with white petals. The color of veins petals varied by the flowering season and by location: wheat and plowed field (weed vegetation increased in a short time). The yellow petals-white base have dominant purple vines in May and grey and purple in September. Petals pale yellow were dominant colors of gray and purple in spring and only grey in autumn. Bright yellow petals have veins in higher proportion in the gray, yellow and purple in spring and grey and yellow in September. In the present study R.raphanistrum have had the yellow-white base petals the best represented as the spring (34.8 %) and in autumn (48.4%). The veins best represented were gray (42.2%) and purple (36.0%) in May and gray veins in autumn season (48.2%).
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biodiversity
