A field trial conducted on the melon cultivar Huanghemi irrigated with saline water was carried out in Minqin County in the two-year period, 2007 and 2008. In three irrigation treatments different saline water concentrations were applied, i.e. 0.8 g L-1 (Control C), 2 g L-1 (Treatment S1) and 5 g L-1 (Treatment S2), reproducing the natural groundwater concentration in the county. The electrical conductivity of the saline water was: 1.00, 2.66 and 7.03 dS m-1, respectively. The aims of the study were: i) to monitor water consumption and water potential; ii) assess, during the whole crop cycle, some growth parameters and their relations for estimating the morpho-functional plant response irrigated with saline water; iii) determine the ion concentration in different plant tissues to evaluate which mechanism the plant activates in the presence of high salt concentrations. Upon increasing the osmotic potential of the soil solution with the increase in salinity, a significant reduction was observed in: water consumption (ETc, mm) and hence leaf area (LA, cm2) and on its duration (LAD m2 d; leaf area duration), energy conversion efficiency (ECE, %), on shoot dry weight aboveground (W, g plant-1), on specific leaf area (SLA, cm2 g-1) and on leaf area ratio (LAR, cm2 g-1). In treatment S2, in addition to these changes which mainly affected the plant morphology with effects on the biomass produced, a moderate reduction was also observed in net assimilation rate (NAR, g m-2 d-1), water use efficiency (WUE), a marked reduction in ECE and, in short, in a reduction in the relative growth rate(RGR, g g-1 d-1). Under salinity stress the plants also responded by accumulating Na in the stems and roots to prevent excessive accumulation of salt and toxicity in the leaves, enhancing the absorption of K, in competition with Na, and its translocation into younger plant parts, and maintaining high concentrations of Ca and Mg.
Impact of saline wter irrigation on yiled, growth indicators and ion composition of melon (Cucumis melo cv Huanghemi) in northwest of China
ATedeschi;MG Volpe;
2014
Abstract
A field trial conducted on the melon cultivar Huanghemi irrigated with saline water was carried out in Minqin County in the two-year period, 2007 and 2008. In three irrigation treatments different saline water concentrations were applied, i.e. 0.8 g L-1 (Control C), 2 g L-1 (Treatment S1) and 5 g L-1 (Treatment S2), reproducing the natural groundwater concentration in the county. The electrical conductivity of the saline water was: 1.00, 2.66 and 7.03 dS m-1, respectively. The aims of the study were: i) to monitor water consumption and water potential; ii) assess, during the whole crop cycle, some growth parameters and their relations for estimating the morpho-functional plant response irrigated with saline water; iii) determine the ion concentration in different plant tissues to evaluate which mechanism the plant activates in the presence of high salt concentrations. Upon increasing the osmotic potential of the soil solution with the increase in salinity, a significant reduction was observed in: water consumption (ETc, mm) and hence leaf area (LA, cm2) and on its duration (LAD m2 d; leaf area duration), energy conversion efficiency (ECE, %), on shoot dry weight aboveground (W, g plant-1), on specific leaf area (SLA, cm2 g-1) and on leaf area ratio (LAR, cm2 g-1). In treatment S2, in addition to these changes which mainly affected the plant morphology with effects on the biomass produced, a moderate reduction was also observed in net assimilation rate (NAR, g m-2 d-1), water use efficiency (WUE), a marked reduction in ECE and, in short, in a reduction in the relative growth rate(RGR, g g-1 d-1). Under salinity stress the plants also responded by accumulating Na in the stems and roots to prevent excessive accumulation of salt and toxicity in the leaves, enhancing the absorption of K, in competition with Na, and its translocation into younger plant parts, and maintaining high concentrations of Ca and Mg.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
