Published in Scientific Papers. Series A. Agronomy, Vol. LXI, Issue 1
Written by Viorel ION, Adrian Gheorghe BĂȘA, Marin DUMBRAVĂ, Lenuța Iuliana EPURE
The elements that are participating in the yield formation, respectively the so called yield components, and the yielding capacity are specific features to the cultivated variety, but these are influenced by the growing conditions which are given by the environmental and technological factors. From this perspective, the aim of this paper is to present the results regrading yield components and grain yield obtained at two sunflower hybrids cultivated at different row spacing and nitrogen fertilisation conditions. In this respect, a field experiment was performed in the climatic condition of 2016 on a reddish preluvosoil from South Romania. The field experiment consisted in sowing two sunflower hybrids under four nitrogen fertilisation conditions (N0; N50; N100; N50+50) and at two row spacing conditions (70 and 50 cm). The following yield components were determined: head diameter, number of grains per head, grain weight per head, and thousand grain weight (TGW). The grain yield was calculated at 9% moisture content and was expressed in kg.ha-1. Under the specific experimental growing conditions, nitrogen fertilisation and increasing the nitrogen rate from 50 to 100 kg.ha-1 increased the grain yield and the yield components, except TGW which tended to be more related to the sunflower hybrid. The average grain yield was higher for row spacing of 70 cm than that registered at row spacing of 50 cm. The two studied sunflower hybrid reacted in their own way to the nitrogen fertilisation conditions as well as to the row spacing conditions.
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