| In this experiment,the tomato "Fentailang" and "Jingfan 301",which using sand culture were cultivated by drip irrigation technique in the solar greenhouse.The first part of the experiment was to study the reasonable location of TDR soil moisture sensor to realize real-time greenhouse sand control tomato control irrigation system.Set the sensor to the horizontal distance and the vertical distance from the drop combined with six treatment.During different growth period,moisture sensor set different soil moisture content upper and lower limits.System analysis of sand culture of tomato growth,root system,photosynthetic parameters,quality,WUE,yield index and etc.In the second part of the experiment,the optimal irrigation position of the previous experimentwas used to guide the irrigation,and eight irrigation quota treatments were set up to study the effects of tomato on the growth index,quality,photosynthesis,chlorophyll fluorescence kinetics and yield of tomato in summer greenhouse under different irrigation quota,and developed reasonable planting tomato irrigation to provide water-saving programs to achieve the purpose of saving investment costs for farmers.This experiment made full use of the northwest non-cultivated land resources under the premise of saving water to provide some guidance for the production of high quality tomato with its light and heat resources and unique climatic conditions.The main results of this study were as follows:(1)Using "Fen tai lang" as the test material:?The plant height index of T1 was smaller than that of T4 and T5,and the leaf area was smaller than that of T5,but the stem diameter and root index of T1 were higher than other treatments.?The net photosynthetic rate,intercellular CO2 mole fraction and chlorophyll content of T1 were higher than those of other treatments.In the fruiting period,the net photosynthetic rate was treated with T1>T5>T6>T4>T2>T3.?Treatment of T1 was not the most water-saving treatment,and WUE and T2 treatment was not significant difference,but slightly higher than other treatment of WUE and yield.?In the fruit quality,the treatment of T1 vitamin C and saccharic acid was relatively high,T2 treatment,although the higher content of vitamin C,the organic acid content was higher than the treatment of T1.In summary,the T1 treatment of sand culture tomato growth and quality was good,the soil moisture sensor buried in the sand from the vertical depth and the horizontal distance of the drip of 10 cm were more appropriate.(2)Taking"Jing fan 301" as the test material:?In the early growth period of tomato,the growth index of plant height of T2 and T5 treatment were larger,the stem diameter did not change obviously,and the leaf area increased with the increase of irrigation quota.As the growth period,the tomato plant of T4 and T5 treatment of plant height,stem diameter than other treatments had significant difference.?The diurnal variation trend of net photosynthetic rate and intercellular carbon dioxide concentration of tomato under different irrigation quota were bimodal curve.The net photosynthetic rate of different irrigation quota treatments was T4>T5>T3>T6>T2>T7>T8>T1.In the three growth stages of tomato,the maximum fluorescence(Fm),variable fluorescence(Fv),Fv/Fm,Fv/Fo and photochemical quenching(qP)increased with the increase of irrigation quota.The initial fluorescence(Fo),non-photochemical quenching(qN)decreased with the increase of irrigation quota,but more than a certain irrigation quota will appear the opposite rule.?The root vigor of each treatment was:T4>T5>T2>T6>T3>T8>T7>T1.?With the increase of irrigation quota,the content of organic acid in tomato decreased first and then increased,while the content of soluble sugar was opposite to that of tomato.T4>T5>T3>T6>T7>T2>T8>T1,the highest treatment of T4 treated with vitamin C were higher than that of other treatments with 102.40%,60.96%,40.89%,4.50%,9.80%,47.30%,and 117.53%,respectively.(3)Through the two tests of the overall analysis,the results are as follows:?From the vertical depth of the dripper,the horizontal distance of shallow treatment T1 is conducive to plant height,stem growth,while root index,quality indicators are better than other treatment,while WUE high,the maximum yield.?The daily irrigation quota of T4 and T5 in summer was 900 mL,and 1100 mL per plant,which was beneficial to the plant height and stem diameter of tomato.The photosynthetic parameters and chlorophyll fluorescence parameters were more suitable,and under the premise of saving water,had significantly improve the quality and yield of tomatoes.Therefore,in the actual agricultural production,can not blindly pursue the "a large amount of water and fertilizer",and ensure a reasonable irrigation quota,combined with modern agricultural water-saving technology to improve greenhouse growth,quality and yield of tomato. |
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