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| DOI：10.13522/j.cnki.ggps.2017.11.003 |
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| Impact of Continuous Aerating Irrigation on Growth, Water Use Efficiency and Nutrient Uptake of Pak Choi Growing in Different Soils |
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LEI Hongjun, YANG Hongguang, FENG Kai, ZANG Ming, PAN Hongwei
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School of Water Conservancy, North China University of Water Resources and Electric Power/Henan Key Laboratory of Water-saving Agriculture, Zhengzhou 450046, China
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| Abstract: |
| A reduction in soil air permeability could make the root zoon anaerobic, affecting crop growth detrimentally. Oneamelioration is to irrigate bymixing water with small air bubbles, i.e., aerating irrigation. This paper examined theuse efficiency of water and nutrientsbypakchoi under aerating irrigation. Pak Choi was grown in pots, each filled by one of the following three soils: clay soil taken from Zhengzhou (CS), silty loam taken from Luoyang (SIL) and sandy loam taken from Zhumadian (SAL). The crop was either watered with conventional irrigation (CK) or drip irrigation with continuous mixing with air bubbles (CAI). Over the growth period, thephysiological traits and nutrient uptake by the crop under all treatmentswere measured. The results showed that, compared to CK, CAI boosted root growth with the dry rootweight in CS and SIL increasing by 35.33% and 26.22% respectively, and root activity increasing by 46.36% and 16.79% respectively. We also found that CAI increased the net photosynthetic rate in CS, SILand SAL by 17.69%, 12.41% and 21.43% respectively; nitrogen uptake in CS and SIL by 23.68% and 27.72% respectively, phosphorus uptake inCS, SIL and SAL by 27.54%, 25.20% and 26.86% respectively, and the potassium uptake by 62.81%, 63.26% and 23.97%, respectively. The yield increase in CS and SIL was 58.42% and 62.03%, and the increase in water use efficiency was 27.86% and 16.47%, respectively. In terms of root growth, net photosynthetic rate, yield, use efficiency of water and nutrients, CAI was more effective for fine texture soils such asclay than for coarse texture soils such as sandy loam. |
| Key words: irrigation; pakchoi; growth and physiological indexes; water use efficiency; nutrient uptake efficiency |
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