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Effect of stand density and nitrogen fertilizer application on sunflower yield



Effect of stand density and nitrogen fertilizer application on sunflower yield



Rasteniev' dni Nauki 29(3-4): 43-47



In field trials on calcic chernozem in NW Bulgaria in 1988-90, sunflowers Super Start, Albena and Viola were grown at 35 000, 45 000, 55 000 or 65 000 plants/ha and given 0, 60 or 90 kg N + 120 kg P2O5/ha. Average seed and oil yields were highest with 45 000-55 000 plants/ha. Applying N and increasing plant density above 45 000 plants/ha did not significantly increase yield or 1000-grain weight.

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