Absorption and Distribution of Mineral Elements in Greenhouse Tomato Under Salt Stress
Tomato plants and their organs were used as test materials in potted plants.Soil salt concentrations were set according to different NaCl salinity gradients as follows,0.07％ (CK),0.15％(T1),0.30％ (T2 ),0.45％ (T3 ),0.60％ (T4 ).The biomass,contents of nitrogen,phosphorus, potassium,calcium,magnesium,sodium,iron,zinc and copper of whole plant and organs of root,stem, leaf and fruit of tomato were studied,in order to provide reference for improving the quality and efficiency of tomato and scientific fertilization in coastal saline-alkali land.The results showed that,the dry matter mass of tomato leaves and whole plant increased first and then decreased with the increase of soil salt content,and the soil salt concentration reached the maximum value at 0.30％.The dry matter mass of roots,stems and fruits in whole plant decreased with the increase of soil salt content, and the dry matter mass of leaves increased with the increase of soil salt content.Nitrogen,phosphorus and potassium mainly accumulated in tomato fruits,accounting for 87.02％,72.40％ and 79.80％ of all elements in tomato plants on average.Different levels of salt stress had little effect on the distribution of nitrogen in tomato organs,but had great effect on the distribution of phosphorus and potassium among organs.The higher the salt concentration,the greater the accumulation of phosphorus and potassium in fruit.The content and accumulation of calcium and magnesium in tomato organs were as follows,leaf>root>fruit.With the increase of soil salt content,the content and accumulation of calcium and magnesium in tomato fruit decreased.With the increasing of soil salt content,the cumulative sodium content of tomato leaves and fruits increased significantly.The maximum iron content and cumulative content of tomato fruit were reached at 0.30％ soil salt concentration,and the copper content of tomato root was higher.With the increase of soil salt content, the flow of copper to tomato fruit decreased.
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