| Coastal saline-alkali soil greatly inhibits the growth and development of solar greenhouse vegetables in coastal area owing to its high salinity. Therefore, this thesis conducted the research on high-sugar tomato production in solar greenhouse at coastal saline-alkali soil in Panjin, Liaoning Province. Firstly, we studied the soil, varieties and irrigation of high-sugar tomato production in solar greenhouse.Second,we make a systematic study about the effect of saline-alkali soil and saline water coupling on the plant growth, fruit yield and quality of high-sugar tomato,with’Jinming’variety,two methods of growth-bag cultivation and soil cultivation, two different saline-alkali soil concentration treatments(EC 0.95 and 1.97mS·cm-1) and four saline-alkali water concentration treatments (EC 1.0、3.0、 5.0、7.0mS·m-1).In order to provide technical solution of high-sugar tomato production in solar greenhouse and making full use of saline-alkali soil,offer theory and techniques guidance for efficient utilization of coastal saline-alkali soil in China.Main research results are as follows:Salinization of soil in Panjin is comparatively high.The soil concentration is 0.39～2.07 mS·cm-1 and pH is 6.06～8.21 without fertilizer.High-sugar tomato can be produced in Panjin.By irrigating with different salinity in seeding stage, resulting that the conductivity of saline-alkali water lower than 7.00mS.cm-1 can be used as stress application means.’Jinming’ tomato with 7.24 of soluble solid contents and 3.31% of soluble sugar contents are filtered.Its soluble sugar contents is higher than’pu luo wang si’and’taoxing’ by 57.6% and 52.5%.Under the irrigation at same saline concentration,with the increase of bag salt contents in saline-alkali soil,plant height and individual yield decrease while soluble sugar, vitamin C and soluble solid content increase. Especially when concentration of salt 3.0mS·cm-1 are irrigated, contents of soluble sugar increase from 3.77% to 4.90%. It increases by 30.0% and the difference is remarkable.Under the same saline-alkali soil bag cultivation,with the increase of saline concentration, plant height and individual yield all firstly increase and then decrease,soluble sugar, organic acid, vitamin C and soluble solid content increase with it,the contents of soluble sugar increase from 3.19%,3.29% to 5.68%,6.14%, separately increased by 78.1% and 86.6%.Under the same saline content,plant height with saline-alkali bag cultivation is shorter than that with saline-alkali soil cultivation.And the production declines while the fruit quality increases obviously. Contents of soluble sugar and vitamin C increase by 61.9% and 68.9% when concentration of salt 1.0mS·cm-1 are irrigated and the differences are outstanding.Under the same conductivity, use the bag cultivation,plant height and individual yield with base material are higher than that with soil cultivation with the growth of salt concentration while contents of vitamin C and soluble solid decrease and the difference is not obvious. When individual yield is irrigated with concentration of salt 5.0mS·cm-1, it is 718.93g with base material and 444.96g with soil culture. Individual yield increases by 61.6%.In a word, the experiment shows that water and soil coupling effect in coastal saline-alkali soil plays a significant role in producing high-sugar tomato,which can also be grown in irrigation of saline-alkali water, but the fruit quality is worse than that. Appropriate condition for sugar-tomato production at coastal saline-alkali land is probably less than 2.07、 7.0 mS·cm-1 of saline-alkali soil and water EC,respectively, in solar greenhouse. |
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