Comprehensive Evaluation of Tomato Growth Status under Aerated Drip Irrigation Based on Critical Nitrogen Concentration and Nitrogen Nutrient Diagnosis.

(2) As the reproductive period progressed, the nitrogen concentration in tomato plants showed a decreasing trend.

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Nitrogen allocation in fruit accounted for 50.5–60.1%, and there was an increasing trend of nitrogen allocation in tomato leaves. 2.1.3.

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With the increase in aeration rate, the slope of the critical nitrogen concentration dilution curve decreased and then increased (i.e., the value showed an overall trend of decreasing and then increasing).

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Model Validation of Critical Nitrogen Concentration Dilution Curves for Tomatoes The above model was validated using the experimentally measured data, and as seen in Figure 5 , the fit between the simulated values and the real values reached a highly significant degree, and the two basically conformed to the linear relationship of y = x , indicating a large degree of conformity.

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The results showed that (1) the dry matter accumulation of tomatoes increased with the increase in the nitrogen application rate in a certain range and it showed a trend of first increase and then decrease with the increase in aeration rate.

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