Evaluation of Plant-induced Electrical Signal and Growth of Broccoli (Brassica oleracea var. italica) in Response to Urea Application in Soil
2022
Kim, H.N. | Yi, P.H. | Park, J.H.
The plant-induced electrical signal (PIES), which reflects nutrient and water uptake by the plant, can be monitored by inserting electrodes on both sides of the plant stem. The objective of this study was to evaluate whether PIES measurement can be applied to evaluate plant growth in response to urea fertilization. Soil was treated with different amounts of urea and the PIES of broccoli grown in the soil was monitored. PIES showed significantly positive correlation with nitrate in stems, indicating that PIES represents increased water and ion transport in broccoli stem caused by increasing urea application. Broccoli leaves treated with high amounts of fertilizer showed the highest chlorophyll content, but there was no significant difference among treatments. The proline content was highest with standard urea application; however, it was in the range of normal condition. There was no significant difference in the growth parameters of broccoli among different treatments, but the PIES was slightly higher when standard amount of urea was applied compared to the other treatments. The PIES values were different among individual broccoli plants and were highly correlated with nitrate in broccoli stem. Thus, PIES could be used as an indicator to evaluate plant nitrogen uptake.
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