Combination Evaluation Model Of Tomato Yield Quality Environment Effect And Its Response To Water And Fertilizer In Greenhouse

At present,the greenhouse vegetables simply pursue the yield,and the excessive fertilization irrigation not only causes the waste of resources,the decrease of utilization rate,but also causes a series of problems such as environmental pollution and the decline of vegetable quality.Water and fertilizer management in modern greenhouse vegetable production should not only consider the single target of yield or quality,but also the realization of many targets,such as yield,quality,water and fertilizer utilization efficiency and environmental impact,and have the characteristics of multi-objective evaluation.Because of the different mechanism of different evaluation methods,using the angle of information and the different emphasis,and adding human factors in the evaluation process,there are also differences between the evaluation results,and there is no comparability.It is difficult to make a comprehensive and accurate judgment of the objective facts by any method.In this study,the water and fertilizer test data were designed with five yuan and two general rotation combinations of greenhouse tomatoes,with 6 nutritional quality indexes(soluble solids,lycopene,soluble sugar,vitamin C;titratable acid;sugar acid ratio)and 3 nutrient use efficiency(nitrogen use efficiency;phosphorus utilization efficiency;potassium utilization efficiency).Rate),yield,water use efficiency and residue of nitrate nitrogen in soil as evaluation indexes,4 single evaluation methods,principal component analysis,membership function analysis,grey correlation analysis and game theory based TOPSIS method,are used to evaluate the nutritional quality,yield quality,yield quality and environmental effects of tomato respectively.On the basis of compatibility test,4 combination evaluation methods,Borda,Copeland,fuzzy Borda and integrated evaluation method based on the whole difference,are used to construct the combined evaluation model respectively.The response of water and fertilizer is analyzed through the post inspection and selection,so as to provide the basis for the production of high yield and high quality and high efficiency tomato production through water and fertilizer management.According to it.The results of the study are as follows:(1)4 kinds of single evaluation methods are used to evaluate the above 3 aspects of the32 processing.Among them,the number of standard differences greater than 4 was 5,7 and13 respectively,and the numbers less than 1 were 5,9 and 4,respectively.The ranking results are inconsistencies,but the correlation coefficients of each single evaluation method and the other 3 methods are evaluated.The mean values are above 0.719,0.605 and 0.769,indicating that there is a certain correlation between 4 single evaluation methods.Moreover,the 4 single evaluation methods have passed the ex ante test and have compatibility,which can be used to construct the combined evaluation model.(2)The results of the above 3 single evaluation methods are combined with 4 kinds of combination evaluation methods,and the number of the standard differences less than 1 of the ranking ranking was 25,17 and 12 respectively,indicating that the evaluation results of the 4combination evaluation models have a strong consistency.The average of the ranking values of each combination evaluation method and the 4 single evaluation methods are 0.954,0.920and 0.847,which show that the correlation between the combined evaluation method and the single evaluation method is good.Through the comparison of the T values,the fuzzy Borda combination evaluation model,the fuzzy Borda combination evaluation model and the integrated evaluation model based on the overall difference are selected to be the optimal combination evaluation model of tomato nutrition quality,yield quality,yield quality and environmental effect respectively.(3)The effects of water and Fertilizer on the nutritional quality of tomato is phosphorus(_iS=174.95)>water(_iS=126.86)≥nitrogen(S _i=125.40)>organic fertilizer(_iS=105.08)>potassium(_iS=47.54).When other factors were intermediate level,the relationship between the evaluation value and the amount of irrigation,nitrogen application and organic fertilizer showed a convex two curve,and the relationship with the amount of phosphorus was linear,and the relationship with the amount of potassium applied in a concave two curve.The effect on tomato yield and quality is yhe effect of tomato on the yield and quality of comprehensive nutrition is nitrogen(S _i=155.90)≥water(_iS=154.36)>organic fertilizer(_iS=133.79)>phosphorus(_iS=92.95)>potassium(_iS=0).When other factors are intermediate level,the relationship between the evaluation value and the amount of irrigation,nitrogen application,phosphorus application and organic fertilizer is convex two curve,and the relationship with the amount of potassium application shows a horizontal line,indicating that the amount of potassium application has no effect on the evaluation value.The effect on tomato yield,quality and environment is phosphorus(_iS=1.082)>nitrogen(_iS=0.876)>water(_iS=0.822)≥organic fertilizer(S_i=0.815)>potassium(S_i=0.457).When other factors were intermediate,the relationship between evaluation value and irrigation amount,nitrogen application rate,phosphorus application amount,potassium application rate and organic fertilizer dosage all showed a convex two degree curve.(4)The interaction between the amount of irrigation and the organic manure,the interaction of the amount of phosphorus and the amount of organic manure hinders the improvement of the evaluation value of the nutritional quality of the tomato.The interaction between the amount of nitrogen and the amount of phosphorus is opposite to the former.The interaction of the amount of water and the organic manure,the interaction of the amount of nitrogen and the amount of phosphorus are all unfavorable to the increase of the evaluation value of the yield and the quantity of the fertilizer;The interaction of potassium application,potassium application and organic fertilizer amount hindered the increase of yield quality environmental effect evaluation,and the interaction of nitrogen application and phosphorus application amount,nitrogen application amount and organic fertilizer amount was opposite to the former.(5)The quantity of irrigation,organic manure and nitrogen,phosphorus and potassium fertilizer were controlled in turn to 446.9-464.4 mm,21.8-24.3 t/ha,520.9.6-577.9 kg/ha,376.3-419.3 kg/ha,692.4-772.1 kg/ha,and the higher evaluation value of tomato nutrition quality is expected.The amount of water,organic manure and nitrogen,phosphorus and potassium fertilizer were controlled in turn to 488.3~508.7 mm,19.3~21.8 t/ha,498.4~565.6kg/ha,399.7~447.1 kg/ha and 698.1~777.9 kg/ha.The higher quality yield evaluation value is expected.The amount of water,organic manure and nitrogen,phosphorus and potassium fertilizer were controlled in turn to 436.2-454.2 mm,23.3-25.8 t/ha,502-559.8 kg/ha,396.6~441.1 kg/ha and 667.8-742.8 kg/ha.The higher yield quality environmental effect evaluation value is expected.