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An experiment was conducted to understand plant available B status in  Entisols  and  Inceptisols  of the Gangetic alluvial plains for cauliflower and to determine critical concentrations of B in soils and plants of cauliflower by using polynomial equations. Soil and cauliflower crops (plant and curd) were collected from 81 cauliflower growing farmers’ fields. Soil samples were analyzed for available B by using hot-CaCl 2  (HCC), KH 2 PO 4  (PDP), tartaric acid (TA) and HCl (HCl) and cauliflower crop samples for B concentration. Hot-CaCl 2  and dilute HCl extracted a higher amount of B followed by TA and PDP in decreasing order. Better relationships of HCC and HCl with soil properties, cauliflower curd and plant weight and B concentration in crop tissues proved their superiority over TA and PDP for assessing B availability for cauliflower in soil. The critical level of adequate HCC and HCl extractable B concentrations were 0.53 and 0.54 mg kg −1  in  Entisols  and 0.57 and 0.58 mg kg −1  in  Inceptisols , respectively. Similarly, critical B concentration in cauliflower plant was 21.5 and 23.8 mg kg −1  in  Entisols  and  Inceptisols , respectively. The novel approach of determination of critical limits of B by using polynomial equations was found effective.

communications in soil science and plant analysis

Determination of Critical Concentrations of Boron in Soils and Plants of Cauliflower ( Brassica oleracea  var. botrytis L.) Using a Polynomial Equation