DEVELOPMENT OF BORON EXTRACTION METHODS FROM PLANTS - DETERMINATION OF AVAILABLE BORON IN CANOLA GROWN SOILS -

This research was carried out in order to determine the most suitable method for chemical extraction of available for plant boron content of agriculture soils. According to the results dry matter yield boron content and total boron uptake of canola were increased with the increasing amount of boron applied to the soil. The methods used for predicting plant available boron content of the soils exposed a high degree of correlation with the biological indexes. Sixteen chemical extraction methods were ranked as: DTPA-NH4OAc > 2 mM DTPA > 1 N NH4OAc (pH: 7) > 1 N NH4OAc (pH: 4.8) > 0.01 M Tartaric acid > Hot 0.01 :VI CaCl2, > 0.05 M Mannitol (pH: 7.5) > 0.05 M Ammonium Oxalate > Hot water > 0.05 M KH2PO4 > Total Boron > 0.02 M HNO3 + 30 % H2O2 > 0.05 M Mannitol/ 0.01 M CaCl2 > Cold 0.01 M CaCl2 > 0.01 M Mannitol/ 0.01 M CaCl2 > 5 % Glycerol/0.01 M CaCl2, The one of the first six chemical extraction method in this arrange could be proposed as the best method to determine the plant available boron content of the soils.