Appropriate irrigation is beneficial to the growth of Jatropha curcas. In order to study effects of irrigation on growth and salt tolerance of Jatropha curcas, seedlings of Jatropha curcas for 1a were used as experimental materials. The irrigation had three levels, i.e. 19.80 mm, 19.80 mm and 39.60 mm alternating irrigation, and 39.60 mm. NaCl was subject to three levels of analytical purity in 50 g air-dried soil such as 0 g, 0.15 g and 0.30 g. The morphology of Jatropha curcas, Na+ environment in its root zone and Na+ accumulation in its plant body were monitored. The results show that the Jatropha curcas has a certain salt tolerance, and the alternating irrigation is more conducive to the growth of Jatropha curcas at 0.30 g NaCl level. With increasing salt concentration, the increment of soil electrical conductivity in the root area of Jatropha curcas decreases gradually. At the same time, the increment of salt concentration also reduces with the increase of Na+ content in soil layer. The Na+ content in the organs of Jatropha curcas from the highest to the lowest is leaf, root and stem. The alternating irrigation of 19.80 mm and 39.60 mm can save 25% water in comparison with that in 39.60mm irrigation, but the growth of Jatropha curcas remains unaffected. Further, there is no significant difference in Na+ content in various organs. Under the conditions of this experiment, when Jatropha curcas is under different degrees of salt stress, the alternate irrigation of 19.80 mm and 39.60 mm is more conducive to growth, and can improve ability of salt tolerance.
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