4.2. Model validation
Data of Exps 1, 3 and 4 were used to validate the model. Using
the greenhouse air temperature at 1.5m above ground, PAR above
canopy, planting date and density, nitrogen concentration of the
nutrient solution and the harvest standard of fruit length as input,
our model (Eqs. (1)–(14)) can give satisfactory predictions of leaf
area per plant, the number of fruits growing on a plant, the length,
harvest date and fresh weight of individual fruit growing a plant and
yield (fruit fresh weight per plant) of cucumber crops grown under
different nitrogen supply conditions. The coefficient of determination
(r2) and the relative root mean squared error (rRMSE) between
the predicted and measured results are listed in Table 4.
Table 4 shows that our model had lower prediction accuracy for
the number of fruits growing on a plant. This can be attributed to
the fact that fruit abortion, caused by many other reasons, was not
taken into account in our model, which resulted in higher errors of
length and harvest date of individual fruits growing on the plant.
4.2. Model validationData of Exps 1, 3 and 4 were used to validate the model. Usingthe greenhouse air temperature at 1.5m above ground, PAR abovecanopy, planting date and density, nitrogen concentration of thenutrient solution and the harvest standard of fruit length as input,our model (Eqs. (1)–(14)) can give satisfactory predictions of leafarea per plant, the number of fruits growing on a plant, the length,harvest date and fresh weight of individual fruit growing a plant andyield (fruit fresh weight per plant) of cucumber crops grown underdifferent nitrogen supply conditions. The coefficient of determination(r2) and the relative root mean squared error (rRMSE) betweenthe predicted and measured results are listed in Table 4.Table 4 shows that our model had lower prediction accuracy forthe number of fruits growing on a plant. This can be attributed tothe fact that fruit abortion, caused by many other reasons, was nottaken into account in our model, which resulted in higher errors oflength and harvest date of individual fruits growing on the plant.
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4.2 4.2. Model validation
Data of Exps 1, 3 and 4 were used to validate the model. Using
the greenhouse air temperature at 1.5m above ground, PAR above
canopy, planting date and density, nitrogen concentration of the
nutrient solution and the harvest standard of fruit length as input,
our model (Eqs. (1)–(14)) can give satisfactory predictions of leaf
area per plant, the number of fruits growing on a plant, the length,
harvest date and fresh weight of individual fruit growing a plant and
yield (fruit fresh weight per plant) of cucumber crops grown under
different nitrogen supply conditions. The coefficient of determination
(r2) and the relative root mean squared error (rRMSE) between
the predicted and measured results are listed in Table 4.
Table 4 shows that our model had lower prediction accuracy for
the number of fruits growing on a plant. This can be attributed to
the fact that fruit abortion, caused by many other reasons, was not
taken into account in our model, which resulted in higher errors of
length and harvest date of individual fruits growing on the plant.
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