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This book is focused on study of the two levels of inventory models . Various inventory models considering Stock dependent demand with preservation technology, Ramp type demand with bulk release, Probabilistic demand with uniform distribution having shortages are discussed. This book attempts to find an optimal solutions for each of the models. The book illustrates numerical solutions of the two levels of inventory models under different demand situations for both deterministic and probabilistic. Numerical illustrations and Sensitivity Analysis for each model are done and appropriate...

Sulphur is required by the plants in amounts similar to phosphorus (P) and is important in protein formation and other plant functions. It significantly influences yield and quality of crops, improves odor and flavors, and imparts resistance to cold, and hence it is generally considered as a quality nutrient . Sulphur-deficient soils are widely distributed around the world. In the event of inadequate level of sulphur in soil, response of crops to other nutrients also declines. In addition, the imbalanced use of nitrogen and phosphorus in comparison to S, has widened, the N: S and P: S ratios...