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Yield performance and agronomic efficiency in oil pumpkins (Cucurbita pepo L. group Pepo) depending on production systems and varieties

available nitrogen. Soil Use Manag. 2002;18:248-255. 9. Chuan L, Hea P, Pampolinoc MF, Johnstond AM, Jin J, Xua X, Zhaoa S, Qiua S, Zhoua W. Establishing a scientific basis for fertilizer recommendations for wheat in China: Yield response and agronomic efficiency. Field Crop Res. 2013;140:1-8. 10. Commission Regulation (EC) No. 889/2008 of 5 September 2008 laying down detailed rules for the implementation of Council Regulation (EC) No 834/2007 on organic production and labelling of organic products with regard to organic production

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