Abstract:A study on Soil Test Crop Response based Integrated Plant Nutrition System (STCR -IPNS) were conducted adopting an Inductive cum Targeted yield model in non-calcareous sandy loam soils of Lithic Haplusteptat Regional Research Station, Tamil Nadu Agricultural University, Paiyur, Tamil Nadu during Kharif 2013 in orderto develop fertilizer prescriptions equation (FPEs) through IPNS for the desired yield targets of rice under SRI technique. A ready reckoner of fertilizer doses at varying soil test value, for attaining 6 to 9 t ha -1 target grain yield of rice has been worked out. Using these equations a validation trial was conducted on Kharif 2014 at this station. The grain yield of rice ranged from 2.54 t ha -1 in absolute control to 8.65 t ha -1 in STCR-IPNS-9 t ha -1. The STCR-IPNS @ 8 t ha -1 was effective and economical as compare with any other treatments. The deviation recorded in the achievement of targets aimed was within the range of ± 10 per cent (90 -110 %) proving the validity of the FPEs. The STCR treatments recorded relatively higher response ratio (RR) and benefit-cost ratio (BCR) over blanket and farmer's practice and STCR-IPNS treatments recorded relatively higher RR and BCR over STCR-NPK alone treatments. Post-harvest soil tests for NPK revealed that there was maintenance of soil fertility. The STCR-IPNS @ 8 t ha -1 was effective and economical as compare with any other treatments. Thus, the Inductive cum Targeted yield model used to develop fertilizer prescription equations provides a strong basis for soil fertility maintenance consistent with high productivity and efficient nutrient management for sustainable and enduring Agriculture.

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The third of a series of articles on the acquisition of scientific literature by libraries in developing countries. Deals mainly with university libraries. Summarizes the Pakistan background and the development of science and technology in Pakistan, the background to library and information development and the existing library resources in science and technology. Describes the organization of acquisitions work, including acquisitions policy, book selection, financial aspects, the procurement of books, import restrictions, book order work, the procurement of periodicals, gifts and exchanges. Presents proposals for further action.

Population dynamics of fruit flies Bactrocera dorsalis Hendel and B. correcta Bezzi were studied in mango ecosystem at Veppalampatti location in Krishnagiri district of Tamil Nadu from October 2017 to September 2018. The fluctuations in the occurrence of adult fruit flies were assessed by methyl eugenol trap catches at fortnight intervals in fixed locations. The results revealed that B. dorsalis reached the first peak (116.00 flies/trap) in first fortnight of June, 2018. Relatively, the initial counts of B. correcta was maximum and the first peak (195.00 flies/trap) was observed during first fortnight of October, 2017. Correlation of trap catches with weather parameters revealed that B. dorsalis trap catches were influenced to an extent of 63%, whereas B. correcta occurrence was correlated with rainfall only.