关键词: 菜园土, 负压灌溉, 小白菜, 生物产量, 根系活力, 脯氨酸, 水分利用效率

Abstract: In order to find out the suitable negative pressure and soil water content for the growth and development of Chinese cabbage under negative pressure irrigation, this paper conducted a pot experiment combining with negative pressure irrigation technology to study the effects of 3 negative pressure levels (-5.0 kPa, -10.0 kPa, -15.0 kPa) on the growth and physiological index of Chinese cabbage in 2 types of vegetable soils (alluvial garden soil and red-garden soil). The results showed that the biomass and root system activity (TTC reduction) of Chinese cabbage was the highest at -5.0 kPa treatment in 2 types of vegetable soils. Along with the decrease of water supply pressure, biomass and root system activity decreased significantly. Proline content was the highest at -10.0 kPa treatment, significantly higher than that of -5.0 kPa and -10.0 kPa treatments. Water use efficiency was the lowest under -5.0 kPa treatment, significantly lower than that of -10.0 kPa and -15.0 kPa treatments. By analyzing the biomass, water use efficiency and physiological responses to soil moisture of Chinese cabbage, the suitable negative pressure was -5.0 kPa in 2 kinds of tested soils, and the moisture content was 25% for the soil derived from alluvial garden soil and 19% for soil derived from red-garden soil.

Key words: vegetable soil, negative pressure irrigation, Chinese cabbage, biomass, root system activity, proline, water use efficiency