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| Nutrient Accumulation Model of Grafted Eggplant in Solar Greenhouse Based on Product of Thermal Effectiveness and Photosynthesis Active Radiation |
| WANG Zepeng1，2，LIANG Zhiguo1，2，FAN Fengcui1*，DU Fenghuan1，LIU Shengyao1，JIA Songnan1，ZHAO Nan1，ZHANG Zhe1，QIN Yong2*，GUO Wenzhong3 |
| 1Institute of Agricultural Information and Economics，Hebei Academy of Agriculture and Forestry Sciences，Shijiazhuang 050051，Hebei，China；2College of Horticulture，Xinjiang Agricultural University，Urumqi 830052，Xinjiang，China；3National Engineering Research Center of Intelligent Equipment for Agriculture，Beijing 100097，China |
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Abstract Taking‘Qieza No.2’as test material，this paper analyzed the dynamic changes in the nutrient accumulation of eggplant whole plant，stem，leaf blade，fruit under 5 nitrogen application levels；and established a simulation model for nutrient accumulation in eggplant grafted in solar greenhouse based on the product of thermal eff ectiveness and photosynthesis active radiation．The results showed that this model could fairly accurately simulate the nutrient accumulation quantity of eggplant under different nitrogen application levels by using radiant heat product．Taking F3 treatment with the highest yield as reference，the standard error RMSE and 1∶1 straight lines determination coeffi cient R2 of N，P，K in plant were 4.88 kg · hm-2 and 0.996 8，0.53 kg · hm-2 and 0.998 3，7.85 kg · hm-2 and 0.997 1，respectively．The standard error RMSE and the R2 between the 1∶1 straight lines determination coeffi cients of N，P，K in stem were 1.66 kg · hm-2 and 0.957 6，0.59 kg · hm-2 and 0.956 1，3.89 kg · hm-2 and 0. 982 0．The standard error RMSE and the R2 between the 1∶1 straight lines of N，P，K in leaf blade were 2.19 kg · hm-2 and 0.976 8，0.40 kg · hm-2 and 0.985 3，4.06 kg · hm-2 and 0.988 6．The standard error RMSE and the R2 between the 1∶1 straight lines determination coeffi cients of N，P，K in fruit were 3.92 kg · hm-2 and 0.991 5，0.48 kg · hm-2 and 0.990 2，6.57 kg · hm-2 and 0.985 3，respectively．The model had high accuracy and could predict the nutrient accumulation quantity in the whole plant and each organ of eggplant under every nitrogen application treatment，so as to provide decisionmaking basis for the intelligent and precise fertilization management for eggplant production in solar greenhouse．
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Received: 02 April 2022
Published: 27 June 2022
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