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Birsa Agricultural University, Ranchi

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Subject: Soil Science and Agriculture Chemistry × Author: Rajeev Kumar × End date: 2007 ×
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    ThesisItemOpen Access
    Potassium, Its Fixation, And Interaction With Nitrogen And Calcium in Alfisols of Chotanagpure Region
    (Birsa Agricultural University, Ranchi, 1998) Rajeev Kumar; H.K. Roy
    The behaviour of potassium in soil is rather complex. Its solubility ranges from easily soluble form in the soil solution to insoluble form in the potassium bearing minerals. Fixation of potassium adds to reserve of pool of soil. It refers to the fraction of K not extracted by neutral salt solution of NH4OAC and this parameter largely decides arid controls the release of K, from the soil. The response of crops to added K is indirectly influenced by the magnitude and extent of K fixation. In ca-deficient Alfisols K -ca equilibria is important because K application is likely to reduce the absorption of Ca and Mg in the plant system. Modifying influence of N in this respect is also important. Based on the above mentioned consideration, its was aimed to study the fixation release and nature of interaction of potassium with N and Ca in Alfisols of Chotanagpur region.Some important physical chemical properties and different forms of K in selected soils of different series were tested for the fixation and release Studies
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    ThesisItemOpen Access
    Forms of Aluminum And Lime Requirement of Cultivated And Forest Soils Of Ranchi
    (Birsa Agricultural University, Ranchi, 1998) Rajeev Kumar; B.P.Singh
    Two soil profiles, twenty surface soil samples and the soils from permanent manurial trial plot receiving treatment Control, N, NP, NPK, FYM and Lime + NPK were studied with a view to characterize the nature of soil acidity, forms of aluminium, lime requirement (LR) and other soil properties. Soils in the forest profile are yellowish red to dark reddish brown. sandy loam to sandy clay loam, weak medium angular to strong angular blocky. The soils in the cultivated profile are yellowish red to strong brown, medium fine angular blocky to moderate angular blocky, mottlings and concretions were also found. The results of the present investigation indicates that in both soil profiles there is increasing trend of clay, C:N ratio, pH, cation exchange capacity, base saturation and total Al whereas organic carbon, total N, different forms of acidity and exchangeable Al showed decreasing trend down the profiles. The values of total acidity, exchange acidity and pH-dependent acidity in forest soil varied from 5.00 to 7.80, 0.40 to 2.05 and 4.60 to 6.27 C mol (P) Kg¹ respectively whereas in the cultivated soils it varied from 5.40 to 8.40, 0.16 to 0.84 and 5.23 to 7.56 C mol (P) Kg¹ respectively. The different forms of aluminium viz., water soluble, exchangeable (KCI) and NH OAc extractable (pH 4.8) in the soils of forest area varied from traces to 0.012, 0.30 to 1.49 and 0.68 to 2.68 C mol (P) Kg¹ respectively whereas water soluble, exchangeable (KCI) and NH OAC extractable (pH 4.8) Al varies from traces to 0.015, 0.01 to 0.58 and 0.52 to 2.52 C mol (P) Kg¹ respectively in surface soils of cultivated area. In the soils of Permanent Manurial Trial Plots, the long term effect of cropping and fertilizer use is very clearly expressed on various soil properties. The clay content, organic carbon, cation exchange capacity and pH was highest in FYM treated plot followed by Lime + NPK treated plot, indicating the favourable effects of balanced nutrition on various soil properties. Different kinds of soil acidity and different forms of aluminium which in excess, affected the plant growth and yield, were highest in N treated plot. Continuous application of nitrogenous fertilizer alone resulted in increased soil acidity with very low pH. This reflects poor soil health as a result of imbalanced nutrient application. The Lime requirement values were also found higher in N, NP and NPK treated plot determined either of the three method (Adams & Evans, Shoemaker, McLean and Pratt, Kamprath), because of higher soil acidity and high exchangeable Al in the corresponding plots. The correlation study indicated that of the soil wal and significantly associated with cation exchange capacity and exchangeable calcium. However, it had significant and negative correlation. with different forms of acidity and exchangeable Al. The Lime requirement had significant positive correletion with exchangeable Al and significant negative correlation exists between pH and Lime requirement.