Water And Nitrogen Treatment On The Regulation Effect Of Jatropha Curcas Under Salt

The shortage of water resources and the soil salinization has seriously restricted the sustainable development of agriculture in our country and the improvement of the ecological environment. And many did not consider the present situation of water resources in the area of water and fertilizer application of nitrogen fertilizer, resulting in a waste of resources is very serious, this problem is particularly prominent in saline soil area.Jatropha curcas L. as a kind of multipurpose tree species, because of its high rate of seed oil can not only be used as an important raw material for the production of biodiesel tree species, combined with Jatropha curcas L. has a strong resistance to environmental stress. Based on the above characteristics of Jatropha curcas L., planting in saline alkali land, not only can obtain considerable economic benefits, but also has obvious effect on improving saline soil vegetation zone.Based on the above background, we choose Jatropha curcas L. as the research object in this study, through the design of different irrigation, fertilizer nitrogen treatment indifferent soil salt stress conditions, to explore the salt stress under different water and nitrogen treatment on growth and root zone soil water, nitrogen, salt movement and utilization of Jatropha curcas L.. Under the conditions of this study, the main conclusions are as follows:(1) Jatropha curcas L. salt stress resistance increased with the increase of irrigation amount:when the soil salt content is 0.2%, Jatropha curcas L. exhibits good resistance to salt stress, increase irrigation amount to a certain extent promotethe growth of Jatropha curcas L., at the same time, the root zone soil soluble the content of sodium ion and the conductivity decreases significantly; when the soil salt content is 0.4%, the growth of Jatropha curcas L. was effected to a certain extent, the increase in the amount of irrigation can alleviate salt stress on the growth inhibition in a certain extent; when the soil salt content is 0.8%, the growth of Jatropha curcas L. was seriously inhibited, increase irrigation did not make the situation improved.(2) Jatropha curcas L.. salt stress resistance increased with the increase of nitrogen:when the soil salt content is 0.2%, Jatropha curcas L. showed good growth stage, the growth is not inhibited, while nitrogen application of a certain role in promoting the growth and development, at the same time, the root zone soil soluble sodium ion content and nitrate content decreased. When the soil salt content is 0.4%, Jatropha curcas L. growth was inhibited, increasing the amount of nitrogen fertilizer will alleviate the adverse effects of salt stress on the growth.When the soil salt content is 0.6%, the growth of Jatropha curcas L. were inhibited significantly, but the increase of amount of nitrogen fertilizer could promote the growth of J Jatropha curcas L.(3) This study showed that when the irrigation quota is 25mm, Jatropha curcas L. could survive in 0.6% of the soil salt content, exhibited resistance to salt stress ability. At the same time, application of nitrogen fertilizer could reduce soil salt stress on the growth of Jatropha curcas L. It would through by slowing growth and leaf area, increased the ratio of root to shoot transport water to the root system to improve the ability of the canopy, and therefore improve the salt stress resistance...