2. Institutional Publications
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Item Influence of added magnesium sources on soil characteristics under submerged condition(Kerala Agricultural University, 1994) Susan Varughese; Jose, A IAn incubation study and a potculture experiment were conducted with two acid rice soils of Kerala, using three Mg sources, viz., magnesite, dolomite and magnesium sulphate tried at two levels of Mg (25 and 50 kg MgO ha ) to study the influence of added Mg on soil characteristics. Available Mg of the karappadam soil was significantly higher than that of the laterite soil. There was no significant difference between the three Mg sources with regard to their contribution to available Mg in the soil. But the Mg availability increased with raised levels of Mg application. A negative relationship was noticed between available K and Mg fractions in the soil. Different sources and levels of applied Mg did not have any significant influence on NILjOAc extractable Ca. Magnesium application raised the pH of the soils. Efficiency of the different Mg sources in correcting the acidic soil reaction was in the order of magnesite dolomite magnesium sulphate.Item Transformations of applied magnesium in soil(Kerala Agricultural University, 1995) Prema, I; Jose, A IAil incubation study was taken up with two acid soils (laterite and Kuttanad alluvium), three sources of Mg (MgSO4.7H2O, magnesite and dolomite) and three levels of Mg (1250, 2500 and 3750 MgO kg ha'1) at field capacity. The rate of release of Mg from different sources was in the order of their solubility i.e., MgSO4.7H2O > magnesite > dolomite. The retention of available Mg was more in treatments with magnesite. The Mg fractions and pH were found to increase with increased levels of application MgO. Magnesite was superior to other sources in supplying available Mg and exchangeable Mg in both the soils.