Effect of Plastic Film Residue on Soil Nitrogen Emissions and Nitrogen Use Efficiency

Abstract

[Objective] The aim of this study is to investigate the effects of different residue amounts on nitrogen utilization efficiency and losses. [Methods] The experiment involved five different residue amounts (0, 180, 360, 720, 1 440 kg/hm2) and two types of residues (polyethylene and biodegradable residues). Through pot experiments, the study examined the impact of different residue contents on soil total nitrogen, nitrogen gas losses, nitrogen fertilizer utilization efficiency, and tomato growth indicators. [Results] The research indicates that with an increase in residue content, the cumulative emissions of ammonia and nitrous oxide in the soil show a trend of first increasing and then decreasing. When the residue content reaches 720 kg/hm2, the cumulative ammonia emission significantly decreases by 11.31% to 13.70%, and nitrous oxide emission decreases by 4.74% to 5.13%. There was no significant difference in nitrogen residue in the soil. When the residue content is below 180 kg/hm2, the residue promotes tomato growth; when the residue content is above 180 kg/hm2, it inhibits tomato growth. Low residue content has no significant effect on nitrogen fertilizer utilization efficiency. However, when the content is higher than 360 kg/hm2, nitrogen fertilizer utilization efficiency shows a negative correlation with residue content. Through comprehensive analysis, it is suggested that soil residue content should be controlled within 180 kg/hm2 to avoid negative effects on crop growth. Furthermore, due to the degradable nature of biodegradable residues, their adverse effects on nitrogen absorption by plants and nitrogen fertilizer utilization efficiency are weaker than those of polyethylene residues. [Conclusion] Therefore, replacing polyethylene residues with biodegradable residues is considered feasible.

Keywords

• plastic film residue
• tomato
• yield
• loss of gaseous
• nitrogen fertilizer use efficiency