Effects of biochar application and water saving drip irrigation on phosphorus leaching in farmland fluvo-aquic soil

doi:10.7523/j.issn.2095-6134.2021.06.007

Abstract

Abstract: The phosphorus (P) leaching from agricultural soils in Haihe River Basin has polluted groundwater in recent years. It is necessary to develop control measures to improve water quality. In this study, a 2-years soil column test (40 cm×45 cm×80 cm) was conducted to analyze the difference of leaching loss of P in soil between added biochar (+B) and without added biochar (-B) during daylily planting under conventional drip irrigation (CDI) and water-saving drip irrigation (80% of CDI, WSDI) conditions. Under the -B condition, the two-year average leaching loss of P under WSDI was 60.4% lower than that under CDI. Under the +B condition, the average leaching loss of P under WSDI was 65.5% less than that under CDI. Implying that WSDI can reduce leaching loss of P in soils, especially under the condition of biochar application. It could be due to the fact that WSDI was not only unfavorable to soil water infiltration, but also enhanced soil P adsorption by reducing soil pH and increasing soil available Fe, which reduced content of soil leachable P, and then control leaching loss of P in soils. Biochar application had no significant effect on soil P leaching, but there were inter-annual differences. In 2017, biochar application under the same irrigation conditions increased the risk of P leaching while showed a trend of decreasing P leaching in 2018. In 2017, WSDI and biochar application significantly reduced the yield. Irrigation, biochar aplication and their interaction had no significant influence on yield in 2018, which means they were not the key factors for the yield with prolonged planting time. Therefore, water-saving irrigation combined with biochar application is recommended as the control measure of soil P leaching in farmland in this area.

Key words: fluvo-aquic soil, leaching loss of phosphorus in soil, biochar, drip irrigation, water-saving irrigation, soil column

CLC Number:

SUN Xiaolei, XIE Zijian, YANG Xiaosong, HU Zhengyi. Effects of biochar application and water saving drip irrigation on phosphorus leaching in farmland fluvo-aquic soil[J]. Journal of University of Chinese Academy of Sciences, 2021, 38(6): 772-781.

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