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Brackish water is used widely for agriculture around the world. The elevated NaCl and Mn content in brackish water can impose toxicity stress on crops, including cotton (Gossypium hirsutum L.). However, there have been no previous studies of the combined effects of NaCl and Mn on cotton growth. This study presents greenhouse pot experiments with 30 different NaCl and Mn conditions. The results show that the cotton vegetative growth tends to be highest when both NaCl and Mn concentrations in irrigation water were low. In contrast, the cotton reproductive growth parameters were higher for elevated NaCl and Mn concentrations in irrigation water. There was an antagonistic relationship for the combined effect of NaCl and Mn on cotton growth and yield. The Mn content in cotton leaves increased with increasing Mn concentration in the 4.5-72 µmmol L-1 range when the NaCl concentration was low. Na content in cotton leaves generally increased as NaCl concentration in irrigation water increased. However, the excess Mn concentration in irrigation water inhibited the absorption of Na. The ratios of K/Na and Ca/Na in the cotton plant generally decreased as NaCl concentration in irrigation water increased. This led to lower tolerance of cotton plants to NaCl stress. The antagonistic characteristics between NaCl and specific trace elements for cotton growth and yield indicated that the micronutrients in saline water can alleviate salt damage. This suggests that using saline water for irrigation carefully may produce adequate cotton yield with lower quality water while minimizing soil salinization. [ABSTRACT FROM AUTHOR]

The NaCl and B levels of brackish water are higher than those of fresh water. Cotton (Gossypium hirsutum L.) is probably affected by simultaneous NaCl and B stress when irrigated with brackish water, but little is understood regarding the combined effect of NaCl and B on cotton growth and the absorption of nutrient elements. Cotton growth and nutrient element content were measured at different NaCl and B concentrations in pot experiments. Cotton growth parameters varied with different NaCl and B concentrations in irrigation water. Cotton stem dry weight (DW) and lint yield decreased with an increase of NaCl concentrations from 15 to 75 mmol L-1 at the B toxicity stress in irrigation water. An antagonistic relationship for the combined effect of NaCl and B on cotton growth was revealed by the experiments. Boron content in cotton leaves increased with an increased B concentration in the 0.046 to 0.736 mmol L-1 range. The combined effect of NaCl and B accelerated the Na accumulated in cotton leaves when NaCl and B were present in high concentrations. The reduction of K and Ca uptake potential at increased NaCl concentrations resulted in lower K+/Na+ and Ca2+/Na+ ratios, thereby inhibiting cotton vegetative growth and lint yield. Brackish water with a total dissolved solid (TDS) content of 1.49 to 1.68 g L-1 moderately promoted cotton growth. [ABSTRACT FROM AUTHOR]

Books reviewed:Richard Baldwin, Rikard Forslid, Philippe Martin, Gianmarco Ottaviano, and Frederic Robert-Nicoud,Economic Geography and Public PolicyRichard K. Green and Stephen Malpezzi,A Primer on U.S. Housing Markets and Housing PolicyPeter King,A Social Philosophy of HousingDavid Harvey,Paris: Capital of ModernityHenri Lefebvre, translated by Robert Bononno,The Urban RevolutionBarry Boots, Atsuyuki Okabe, and Richard Thomas,Modelling Geographical Systems: Statistical and Computational ApplicationsJanÖhman and Kirsten Simonson,Voices from the North: New Trends in Nordic Human GeographyMichael Keating, John Loughlin, and Kris Deschouwer,Culture, Institutions and Economic Development: A Study of Eight European RegionsGertrude Tumpel-Gugerell and Peter Mooslechner,Economic Convergence and Divergence in Europe: Growth and Regional Development in an Enlarged European UnionAndreas Faludi,European Spatial PlanningRon Martin and Philip S. Morrison,Geographies of Labour Market InequalityBent Flyvbjerg, Nils Bruzelius, and Werner Rothengatter,Megaprojects and Risk: An Anatomy of AmbitionAlan Altshuler and David Luberoff,Mega-Projects: The Changing Politics of Urban Public InvestmentNorman Walzer,The American Midwest: Managing Change in Rural TransitionWilliam M. Lewis Jr.,Water and Climate in the Western United StatesNives Dolšak and Elinor Ostrom,The Commons in the New Millennium: Challenges and AdaptationOrganisation for Economic Co-operation and Development(OECD),Entrepreneurship and Local Economic Development: Programme and Policy RecommendationsYeonwoo Lee,Schumpeterian Dynamics and Metropolitan-Scale ProductivityFiorenza Belussi, Giorgio Gottardi, and Enzo Rullani,The Technological Evolution of Industrial DistrictsDaniel Griffith,Spatial Autocorrelation and Spatial Filtering: Gaining Understanding through Theory and Scientific VisualizationClaire Freeman and Michelle Thompson-Fawcett,Living Space: Towards Sustainable Settlements in New Zealand [ABSTRACT FROM AUTHOR]