| A greenhouse fertigation experiment was conducted to study the effects of differentirrigation and ferlization on growth and quality of tomato, which can provide a theoreticalbasis for the high yield and good quality water and fertilizer coupling model in this field. Inthe experiment, the tomato cultivar ’ HuiYu0806’ was chosen as experiment material, anddesigned with two factors and three levels, three irrigation amounts[I1(100%ET0),I2(75%ET0), I3(50%ET0)], three NPK fertilizer application rates[F1(N480kg·hm-2, P2O5240kg·hm-2, K2O300kg·hm-2), F2(N360kg·hm-2, P2O5180kg·hm-2, K2O225kg·hm-2), F3(N240kg·hm-2, P2O5120kg·hm-2, K2O150kg·hm-2)], and three replicates. The results showed asfollows.(1) Different irrigation and fertilization have different degrees of impact on plant heightand stem diameter. When under the same amount of irrigation, plant height increases with theincrease of fertilizer; when under the same amount of fertilizer, the height of each processingplant increase with increasing irrigation. It shows that the excessive irrigation and fertilizer ingrowing peak period of tomato will inhibit the growth of stem diameter.(2) Different irrigation and fertilization have different degrees of impact on tomato yield,dry matter accumulation and irrigation water using efficiency. Tomato yield was effected bydifferent irrigation volume: under the condition of F1and F3, I1> I2>I3.Under the conditionof F2, I1>I2>I3；Try matter accumulation was effected under the different irrigation volume:under the condition of I1and I2: F2>F1>F3；under the condition of I3: F1>F2>F3.And tomatoyield and dry biomass has a significant linear correlation, the correlation coefficient R2reached0.8823. Indicate that high or low volume irrigation fertilization would inhibit tomatoyield and dry matter accumulation. The proper irrigation fertilization would promote yield anddry matter accumulation(3) Different irrigation and fertilizer have different effect on different quality oftomatoes.Fertilizer has no significant affect on soluble solids；Impact of irrigation on solublesolids content is bigger than fertilizing capacity, and reducing the amount of irrigation cansignificantly increase the soluble solids content. Under the same irrigation condition, the Vcchange with different fertilization: F2>F1>F3；the Vc change with different irrigation: underthe F1condition, I1>I2>I3；Under the F2and F3fertilization condition: I2>I1>I3.Under the same irrigation condition, lycopene content change with different fertilization: F2>F1>F3; under F2and F3fertilization, I2>I1>I3.Under the F2fertilization condition, I2>I1>I3.Under the sameconditions of irrigation, the soluble sugar reduce with the increases of fertilization; Under thesame conditions of fertilization, the soluble sugar content increases with decrease in theamount of fertilizer. The tomato organic acids changes with the different fertilizer, and reachthe peak under the moderate fertilization (F2) with different water levels. With increasingirrigation amount, the lycopene content first increases then reduce. Sugar-acid ratio changeswith fertilizer. Under the irrigation of I1and I2, the sugar-acid ratio reduced with increasingamount of fertilizer. Under the irrigation of I2, the impact of fertilizer on sugar acid ratio,F2>F1>F3; under the same conditions of fertilizer, sugar-acid ratio decreases with the increaseof irrigation, that means the tomato sugar-acid ratio is higher with lower irrigation.(4) Distribution of irrigation and fertilization has remarkable influence on soil nitratecross-section. In the same period, with the increasing in fertilization or decreasing in irrigation,the nitrate increases in the0~50cm soil. Under the same conditions of irrigation, nitrate indifferent soil profile changes with different irrigation. At different growth stages, nitrate insoil profile decrease with the increased irrigation. With the extension of the growth period, theentire processing soil nitrate is gradually declining. With increasing distance from the driptape, the different processing soil nitrate also increases. |
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