| Effect of negative water pressure irrigation on nutrient uptake of eggplant and soil nutrient environment |
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| DOI：10.7606/j.issn.1000-7601.2021.04.01 |
| Key Words: negative water pressure irrigation soil nutrient soil enzyme eggplant nutrient uptake |
| Author Name | Affiliation | | ZHANG Jingyu | College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing, Helongjiang 163319,China | | HE Xiaolei | College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing, Helongjiang 163319,China | | SUN Jiayu | College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing, Helongjiang 163319,China | | LONG Huaiyu | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081,China | | WANG Peng | College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing, Helongjiang 163319,China |
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| Abstract: |
| Using the negative water pressure supply device, this study examined the effect of negative irrigation on eggplant nutrient uptake, available nutrient content of soil and soil enzyme activity in order to select the optimal pressure of supply water for eggplant growth.The findings provided a theoretical basis for water saving irrigation of eggplant. The experiment used pot in rain shelter and soil was meadow chernozem.Four treatments were included in the experiment:three different water supply pressures (-3, -8, -15 kPa) and manual watering (CK) to determine the nitrogen, phosphorus and potassium nutrient uptake of eggplant, soil available nutrient content and soil enzyme activity during the growing period. The results showed that water supply pressure controlled at -3 kPa significantly increased nitrogen, phosphorus and potassium uptake of eggplant stems, leaves, and fruit organs and promoted the transformation of nitrogen and phosphorus and potassium to the fruit, which in turn increased the yield compared with the CK treatment. Compared with the CK treatment, under the treatment of -3 kPa water supply pressure, the content of alkali hydrolysable nitrogen, available phosphorus and available potassium increased 11.03%～21.98%, 14.89%～23.97% and 6.48%～13.32% respectively.In addition, the urease, the phosphatase and the sucrose activity of soil increased 11.29%～19.78%, 9.09%～16.91% and 3.74%～13.17% respectively during the eggplant growing stage, with the catalase activity increasing 5.08% at the early fruit bearing stage. Correlation analysis showed, under the negative water pressure supply, there was a significant positive correlation or most significant positive correlation existed between nitrogen, phosphorus and potassium content of eggplant stem, leaf, fruit and soil alkali hydrolysable nitrogen, available phosphorus, and available potassium content. The most significant positive correlation was also found between soil nutrient content and soil biological activity. In summary, conducting negative water pressure irrigation controlled at -3 kPa improved nitrogen, phosphorus and potassium uptake of eggplant and soil available nutrient content. At the same time, it increased the activity of soil urease, phosphatase, sucrose and catalase. |
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