COLAK, Bugra Ondokuz Mayis University - faculty of Agriculture - Soil Science and Plant Nutrition Department, Turkey , KORKMAZ, Ahmet Ondokuz Mayis University - faculty of Agriculture - Soil Science and Plant Nutrition Department, Turkey , HORUZ, Ayhan Ondokuz Mayis University - faculty of Agriculture - Soil Science and Plant Nutrition Department, Turkey

BORON STATUS, BORON FRACTIONS AND ITS AVAILABILITY IN SUGAR BEET GROWN SOILS

33868

The objectives of this study are to determine boron (B) status, fractions and availability of sugar beet grown soils and their relationships with some soil properties. For this purpose, Colwell method (biological indexes) and hot water B extraction method were used to determine plant available B contents of soils. Furthermore, easily soluble, specific adsorbed, organic matter dependent, oxide dependent and residual B fractions of the soils were determined. Boron deficiency symptoms in plants were observed when plants’ ages were 56 days in 4 soils and 62 days in 6 soils. B deficiency was observed in the 63.6 % of the soils taken from Çarşamba and in the 33 % of the soils taken from Bafra while Boron deficiency was not observed in the sunflower plants grown on soils taken from Suluova. The B contents extracted with hot water for the soils showed B deficiencies were generally found to be lower than 1.00 ppm.The available B contents extracted with hot water for the soils showed no B deficiencies were found to be between 1.39 and 4.61 ppm. The relationships among the biological indexes indicated that the available B content of the soils can be determined by the hot water extraction method. Easily soluble and oxide dependent B contents gave significant relationships with the biological indexes. As the clay, organic matter and exchangeable Na content increased B contents of the plants at their harvest ages and B uptakes by plants also increased significantly.

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Available boron , Boron fractions , Hot water method , Colwell method

Anadolu Journal Of Agricultural Sciences

167