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Full-Text Articles in Life Sciences
Changes In Hay Yield And Quality Of Bulbous Barley At Different Phenological Stages, Ferat Uzun
Changes In Hay Yield And Quality Of Bulbous Barley At Different Phenological Stages, Ferat Uzun
Turkish Journal of Agriculture and Forestry
The objective of this study was to determine the changes in hay yield and quality components at different phenological stages of a bulbous barley (Hordeum bulbosum L.) population handpicked from natural flora during 2003-2007 in Samsun, Turkey. The phenological stages of bulbous barley during spring-summer (grazing maturity, early heading, heading, and milk-dough) and autumn (early growing) were investigated. Significant differences were observed in hay yield, relative feed value (RFV), crude protein (CP), acid and neutral detergent fiber (ADF and NDF), Ca, Mg, K, P, Mn, Fe, and Zn concentrations, and K(Ca + Mg)^{-1} and Ca P^{-1} ratios of DM, depending …
Global Economics Of Nutrient Cycling, Bert H. Janssen, Oene Oenema
Global Economics Of Nutrient Cycling, Bert H. Janssen, Oene Oenema
Turkish Journal of Agriculture and Forestry
This paper briefly discusses global human requirements of protein nitrogen (N) from crops and animals, and then estimates the need for fertilizer N as a function of N use efficiency, and the recycling of N from animal manure and sewage wastes. These estimates are based on various assumptions and simple calculations. Results suggest that globally only 1% of N input is retained, 28% is lost to the wider environment, and some 70% is potentially available for recycling via manure and sewage. In addition, large amounts of nutrients recycle via crop residues. In practice, only a fraction of this potential is …