Growth and physiological adaptability of three hybrid poplars planted in different saline-alkali soil.
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Inland non-saline soil with high fertility and saline soils with low or high fertility were potted to cultivate cotton plants outdoors.Effects of both fertility and salinity of these soils on plant growth and physiological characteristics in cotton were examined.The results showed that seedling emergence,plant height,leaf expansion,dry matter accumulation,content of leaf chlorophyll and net leaf photosynthetic rate of cotton plants grown in saline soil with low-fertility(SL soil) were significantly inhibited relative to those in inland soil with high fertility(IH soil).Dry biomass and seed cotton yield of plants in SL soil decreased by 31.7% and 20.7%,while those of plants in the saline soil with high fertility(SH soil) decreased by 20.6% and 11.8%,compared with those in IH soil,respectively.It is suggested that inhibited photosynthesis and seed cotton yield are attributed to both salinity and nutrient deficiency in SL soil.Soil salinity significantly decreased the ratio of root to canopy,which can not be fully solved by increasing soil fertility alone.It is concluded that decreasing soil salinity and improving soil fertility are essential pathways to enhance cotton production in coastal saline soils.
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