Details

Autor(en) / Beteiligte

• Wang, Ruoshui
• Kang, Yaohu
• Wan, Shuqin
• Hu, Wei
• Liu, Shiping
• Jiang, Shufang
• Liu, Shuhui

Titel

Influence of different amounts of irrigation water on salt leaching and cotton growth under drip irrigation in an arid and saline area

Ist Teil von

• Agricultural water management, 2012-07, Vol.110, p.109-117

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2012

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• ► Large reductions in both ECe and SAR of a highly saline-sodic soil occurred during three crop seasons. ► Five soil-water matric potentials at 20cm directly below a drip emitter were used to trigger irrigation. ► The reductions in ECe and the amount of leached salt in the 0–80 cm depth declined with decreasing SMP. ► Both the highest seed cotton and lint yields were obtained for an SMP of −5kPa in 2009 and 2010. ► A SMP of −10kPa may be the best water treatment in achieving the needed reclamation and minimizing the environmental effects. In order to evaluate the effects of different amounts of water, applied by drip irrigation, to a saline–sodic soil (surface ECe>40dS/m; SAR>40), on cotton growth and soil salinity, a three-year experiment was conducted on a saline wasteland in Xinjiang Northwest China during 2008–2010. Five water treatments were used for this experiment based on the soil–water matric potential (SMP) measured 20cm beneath a drip emitter located close to the plant: the SMP levels used to determine when to irrigate were −5kPa (S1), −10kPa (S2), −15kPa (S3), −20kPa (S4), and −25kPa (S5). After three years, both the soil salinity (ECe) and sodicity (SAR) declined significantly in 0–120cm depth and more reduction were achieved in 0–40cm soil depth than in 40–80 and 80–120cm depths. Moreover, the reductions of SAR were smaller than those of ECe. Additionally, the amount of salt removed from the 0 to 80cm depth decreased with decreasing SMP threshold. The S1 treatment resulted in the highest lint yields in 2009 and 2010. Considering the effects of leached salts on the environment of deep soil layer and the yield of cotton, an SMP of −10kPa can be used to trigger irrigation for cotton in the first three years for saline wasteland reclamation in Xinjiang Northwest China.