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Effect of sowing rate and date and fertilizer application on agronomic characteristics of sunflowers. I. Seed and oil yield and yield components



Effect of sowing rate and date and fertilizer application on agronomic characteristics of sunflowers. I. Seed and oil yield and yield components



Pesquisa Agropecuaria Brasileira 28(7): 833-841



In a field trial in 1988/89 at Eldorado do Sul, Rio Grande do Sul, Brazil, sunflowers Contisol 711 were sown on 27 July or 19 Sep. at rates of 30 000, 45 000, 60 000 or 75 000 seeds/ha with or without NPK fertilizer. For the earlier sowing date, seed yield increased with increasing sowing rate with fertilizer, reaching about 2.7 t/ha at 75 000 seeds/ha, and peaked at 60 000 seeds/ha without fertilizer (about 1.95 t/ha).

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