Effect of drip-irrigation with saline water on Chinese rose (Rosa chinensis) during reclamation of very heavy coastal saline soil in a field trial

Abstract

a b s t r a c tDrip-irrigation with saline water was used for reclamation of very heavy coastal saline soils and its effects on salt-sensitive plants were also evaluated in a three-year trial in the coastal region of east China. The original soil salinity expressed as electrical conductivity of the saturation paste extract (EC e ) was an average of 27.13 dS/m in the 0-100 cm depth. The experiment included five treatments of salinity levels of 0.8, 3.1, 4.7, 6.3 and 7.8 dS/m of irrigation water. Chinese rose (Rosa chinensis), a salt-sensitive species, were planted in the sandy loam soil to determine the effect of saline environment on growth characters and dry matter production. Drip-irrigation had a significant positive impact on salt leaching, and the very highly saline soil became mildly saline after reclamation in root zone of soil profiles irrigated with water of salinity up to 7.8 dS/m. An increase in salinity of irrigation water had adverse effects on plant height, stem diameter, survival rate and dry matter production. Root:shoot ratio increased with increasing water salinity. The values of soil-salt tolerance threshold were 2.39 dS/m at emergence and 2.78 dS/m in the growth period after emergence. The emergence rate and dry mass decreased by 27.39 and 41.19% for each unit of EC e increase in the root zone, respectively. These results implied that drip-irrigation with saline water by controlling soil matric potential under a gravel-sand layer was effective in reclamation of this very heavy coastal saline soil for sensitive species such as Chinese rose.

A vegetation reconstruction method to plant Sedum spectabile Boreau using drip-irrigation with saline water on a coastal saline soil in region around Bohai Gulf

“…Under our experimental conditions, relative leaf water content (RWC) increased with irrigation water salinity, especially in 2014 (Table 4), which may have important implications for osmotic adjustment under saline irrigation. This information is inconsistent with the results of Li et al (2015b), who reported that irrigation with saline water had a negative effect on leaf water status for Chinese rose: RWC decreased with increasingly salinity of irrigation water. This may be because that different species responded differently to salinity, and that Chinese rose is sensitive to salt but Sedum spectabile Boreau is salt-tolerant.…”

Response of Daylily (Hemerocallis hybridus cv. ‘Stella de oro’) to saline water irrigation in two coastal saline soils

“…3. Many studies reported that plant growth and dry mass production were affected by salinity, which has been confirmed in crops and other plants (Li et al, 2015b). In this study, the survival rates of Daylily decreased with irrigation water salinity increasing in 2015 and with year (Table 3 and Fig.…”

Mulches Improve Ridge‐tillage Tomato Production under Drip Irrigation with Saline Water

“…Irrigation with fresh water at seedling transplanting in 2009 further reduced soil salinity. This process not only ensured survival of tomato seedlings, but also likely reduced the adverse effects on yield of increasing levels of soil salinity from the continued use of saline irrigation water (Li et al, 2015). This may be the main reason for no yield reduction in 2009 compared with yields obtained in other years.…”

“…Thus, maintaining a good scheduling of drip irrigation was very important. Control high soil matric potential in root zone under drip irrigation has been proved as a good method to using saline water for irrigation (Kang et al, 2010;Li et al, 2015), high soil matric potential could compensate for the decreased osmotic potential caused by irrigation with saline water, and maintain a constant high total water potential. In our research, the SMP values at 20 cm immediately underneath the emitter in the ridges were maintained above -20 kPa during the entire growing season, it indicated that soil water potential gradient always existed in the ridges (Li et al, 2017), which benefits soil water movement and results in good salt leaching, and alleviate the damage for crop growth induced by improper salinity.…”