Critical Range of Soil Boron for Prognosis of Boron Deficiency in Oilseed Rape

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Relationships between seed yields of oilseed rape (Brassica napus L.) and extractable boron concen-trations in three soil layers (A, P and W) were investigated through ten experiments on three types ofsoils (Alluvic Entisols, Udic Ferrisols and Stagnic An
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