1. Field Crops Research
Volume 16, Issue 2, May 1987, Pages 157–175
Sulphur nutrition of sunflower (Helianthus annuus) as affected by nitrogen supply: Effects on vegetative growth, the development of yield components, and seed yield and quality
P.J. Hocking, P.J. Randall, A. Pinkerton
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http://dx.doi.org/10.1016/0378-4290(87)90005-0Спасибо большое!