A field study conducted for three years (1992–93 to 1994–95) at the Indian Agricultural Research Institute on a sandy clay loam shows that for sustained production in a rice-wheat cropping system integrated nutrient management involving both organic manures/residues and chemical fertilizers is a must. In control plots receiving no organic manures/residues but as high as 120 kg N ha –1 only 8 t ha –1 yr –1 grain could be produced. This productivity could be achieved by Sesbania/cowpea green manuring or mungbean residue or farmyard manure without any chemical fertilizer; with 80 kg N ha –1 it could be increased to 9 t ha –1 yr –1 . Since the availability of farmyard manure is decreasing due to increased mechanization, the generation of in situ organic residues, preferably a legume, is a better alternative.
In a topological spaceX, a T2-distinct pointx means that for anyy∈X x≠y, there exist disjoint open neighbourhoods ofx andy. Similarly, T0-distinct points and T1distinct points are defined. In a Ti-distinct point-setA, we assume that eachx∈A is a Ti-distinct point (i=0, 1, 2). In the present paper some implications of these notions which ‘localize’ the Ti-separation axioms (i=0, 1, 2) requirement, are studied. Suitable variants of regularity and normality in terms of T2-distinct points are shown hold in a paracompact space (without the assumption of any separation axioms). Later T0-distinct points are used to give two characterizations of the RD-axiom.1 In the end, some simple results are presented including a condition under which an almost compact set is closed and a result regarding two continuous functions from a topological space into a Hausdorff space is sharpened. A result which relates a limit pointv to an ω-limit point is stated.
Authors:N. Misra, K. Singh Mudher, and V. Venugopal
Preparation and characterization of four new hydrated alkali metal molybdates Na2Mo4O136H2O, K2Mo4O133H2O, Rb2Mo4O132H2O and Cs2Mo4O132H2O are described. The compounds were prepared by crystallizing the solution obtained by dissolving MoO3 and corresponding alkali metal carbonates A2CO3 or molybdate A2MoO4 in stoichiometric amount in distilled water. The hydrated molybdates were characterized by thermal (TG/DTA) and X-ray diffraction
(XRD) methods. The number of water molecules in the compounds were determined from their TG /DTA curves recorded in air and
identification of their dehydration products was done by XRD. The cell parameters of the compounds were obtained by indexing
their XRD patterns. Attempt to prepare the corresponding hydrated compound of lithium was not successful.