Increasing the Environmental Sustainability of Greenhouse Vegetable Production by Combining Biochar Application and Drip Fertigation—Effects on Soil N2O Emissions and Carbon Sequestrations

Abstract

Drip fertigation with reduced fertilizer and water inputs has been widely used in greenhouse vegetable production in China. However, farmers usually do not apply additional organic material with a high carbon content, although soil organic carbon (SOC) concentrations are mostly below the optimum level for vegetable production. Returning straw or biochar to fields is an effective strategy for sustainability and environmental friendliness. We tested whether drip fertigation, (DIF) combined with maize straw (DIF+S) or biochar (DIF+BC), is a suitable option to improve SOC sequestration over eight growing seasons, and how these options affect soil N2O emissions and yields or partial factor productivity of applied N (PFPN) of crops over three growing seasons. During the winter–spring growing season, DIF+BC significantly reduced soil N2O emission by 61.2% and yield-scaled N2O emission by 62.4%, while increasing the tomato yield and PFPN compared with DIF. Straw incorporation had similar trends but without significant effects. Conversely, straw and biochar incorporation increased N2O emission during the autumn–winter season. The structural equation model indicated N2O emission was dominantly driven by soil NH4+-N concentration, temperature and moisture. The N2O emission factor decreased significantly with increased PFPN. Moreover, the contribution of biochar to the increased SOC was approximately 78%, which was four times higher than that of straw incorporation. Overall, the results highlighted the potential of drip fertigation with biochar incorporation to mitigate N2O emissions, improve PFPN and significantly increase SOC storage, which could all contribute to maintaining environmental sustainability and soil quality of greenhouse vegetable production.

Agricultural management practices in China enhance nitrogen sustainability and benefit human health

“…This equivalence underscores their pivotal role in shaping agricultural productivity. Moreover, these discoveries align harmoniously with prior research conducted at experimental sites [30][31][32][33][34][35][36] , thereby providing additional validation to the paramount importance of these best management practices in advancing the cause of sustainable agriculture.…”

Application of humic acid increases the economic value and yield of superior tobacco as well as improves the chemical and processing quality

“…fertilizer and irrigation during the vegetable growing season far exceeds plant demand (Lv et al, 2019;Zhao et al, 2022).…”

“…As irrigation facilities and transportation conditions have developed in recent years, the continuous cultivation of tobacco and vegetables has become a common mode in Yunnan (Duan et al., 2021). Economic benefits can be increased by ensuring that the amount of fertilizer and irrigation during the vegetable growing season far exceeds plant demand (Lv et al., 2019; Zhao et al., 2022).…”