Evaluation of different soil extractants for assessing B availability to maize (Zea mays L.)

• Chhaya Joshi ^[2] ; Satya Pratap Pachauri ^[2] ; Prakash Chandra Srivastava ^[2] ; Arvind Kumar Shukla ^[1]
  1. [1] Indian Institute of Soil Science

     Indian Institute of Soil Science

     India

     
  2. [2] Govind Vallabh Pant University of Agriculture & Technology
• Localización: Spanish Journal of Soil Science: SJSS, ISSN-e 2253-6574, Vol. 4, Nº. 3, 2014, págs. 254-264
• Idioma: inglés
• Títulos paralelos:
  • Avaliação de diferentes extractantes de solo para avaliar a disponibilidade de B para o milho (Zea mays L.)
  • Evaluación de diferentes agentes de extracción del suelo para estimar la disponibilidad de B para maíz (Zea mays L.)
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• Resumen

  • A greenhouse experiment was conducted with twenty surface (0-15 cm) soil samples using maize (cv.Pragati) as a test crop to estimate the critical limits of B in soil and plant. Five soil extractants used in the study varied in their B extraction capacity and could be arranged in the order: Mehlich 3 (pH 2.0) > 0.005 M DTPA + 1 M ammonium bicarbonate (pH 7.6) > 1 M MgCl2 (pH 6.0) > 0.01 MCaCl2 > Hot water. All B extractants employed in the present investigation showed highly significant relationships with Bray’s percent yield of maize. The critical limits of B in soil for maize were 0.61 mg hot water soluble B, 2.06 mg AB-DTPA extractable B, 1.03 mg 0.01 M CaCl2 extractable B, 2.20 mg 1 M MgCl2 extractable B and 2.56 mg Mehlich 3 extractable B kg-1 soil. The critical limit of B in maize (cv. Pragati) plants of 30 d age was found to be 11.2 mg B kg-1 dry plant tissue. The dry matter yields and total B uptake of maize plants related significantly to B extracted by AB-DTPA (pH 7.6), 0.01 M CaCl2 , 1 M MgCl2 (pH 6.0) and Mehlich 3 (pH 2.0). Boron concentration of maize plants related significantly to B extracted by AB-DTPA (pH 7.6), 1 M MgCl2 (pH 6.0) and Mehlich 3 (pH2.0). Among soil extractants examined in the present study, Mehlich 3, a multi-nutrient extractant, appeared to be more suitable for predicting B eficiency in soils as this method had easy adoptability in soil testing laboratories owing short extraction time requirement.