Influence of applied nutrients on the distribution pattern of zinc fractions in paddy soils
1993
Abedin Mian, M.J. | Blume, H.P. | Bhuiya, Z.H. | Eaqub, M. (Bangladesh Agricultural Univ., Mymensingh (Bangladesh). Dept. of Soil Science)
Samples of silt loam paddy soils (Aeric Haplaquepts - USDA, Sonatola series - Local) of various depths were collected from three plots of different fertility located at Bangladesh Agricultural University farm, Mymensingh. The samples were analysed by different methods to see the amount of zinc present in soil solution (water soluble), exchange sites, organic matter, oxides and silicates of soils. The total (HNO3+HClO4 extractable) content of zinc in soils varied between 98 and 110 mg/kg soil in the upper 0-2 cm which in general decreased with depths and reached a value of 70 mg/kg soil in the 40-80 cm. Like total content; the water soluble, exchangeable, organically bound and silicate bound forms also decreased with depths but the amount of oxide bound form increased. The zinc treated plot contained the highest amount of zinc in water soluble, exchangeable and organically bound forms and in soils solution. The silicate bound form of Plots I and III was higher than Plot II at all depths below 10 cm, while above 10 cm the content of Plot II was higher than the remaining plots. Results showed a strong negative balance of Zn in control plots.
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