College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
Nanjing Agricultural University (Suqian) Academy of Protected Horticulture, Suqian, 223800, China.
Environ Sci Pollut Res Int. 2019 Jan;26(1):659-671. doi: 10.1007/s11356-018-3538-1. Epub 2018 Nov 9.
Poultry biogas slurry, a by-product of the biogas production process, is rich in nutrients. However, improper handling increases the potential for serious environmental contamination and resource waste. The preparation of nutrient solutions for hydroponic lettuce production requires large amounts of mineral fertilizers, which provides an opportunity for poultry biogas slurry to enter the crop nutrient cycle. To assess the feasibility of the application of poultry biogas slurry, we used different proportions of biogas slurry and mineral fertilizers in a hydroponics experiment with lettuce. Four treatments were established: HS (half-strength Hoagland solution), BS (2.6% biogas slurry), BS + HS (1.3% biogas slurry + quarter-strength Hoagland solution), and BS + MF (2.6% biogas slurry + mineral fertilizers). The addition of poultry biogas slurry (BS + HS) did not have an adverse effect on lettuce growth, significantly increased the soluble sugar concentration, reduced the nitrate concentration, and the concentrations of heavy metals were still within the safety standards. In addition, the application of poultry biogas slurry could effectively reduce the production costs, energy consumption, and greenhouse gas emissions of hydroponically grown lettuce. Based on our study, poultry biogas slurry could replace 50% of the mineral fertilizer used in hydroponic lettuce production. The key is to control the electrical conductivity and replenish the nutrients that are lacking in the biogas slurry, especially magnesium.
禽畜沼气渣是沼气生产过程中的一种副产物，富含营养物质。然而，如果处理不当，会增加严重环境污染和资源浪费的风险。水培生菜生产用营养液的制备需要大量的矿物肥料，这为禽畜沼气渣进入作物养分循环提供了机会。为了评估禽畜沼气渣应用的可行性，我们在以生菜为对象的水培实验中，使用了不同比例的沼气渣和矿物肥料。设立了四个处理组：HS（半强度 Hoagland 溶液）、BS（2.6%沼气渣）、BS+HS（1.3%沼气渣+四分之一强度 Hoagland 溶液）和 BS+MF（2.6%沼气渣+矿物肥料）。添加禽畜沼气渣（BS+HS）对生菜生长没有不良影响，显著增加了可溶性糖浓度，降低了硝酸盐浓度，重金属浓度仍在安全标准内。此外，禽畜沼气渣的应用可以有效降低水培生菜生产的成本、能源消耗和温室气体排放。基于我们的研究，禽畜沼气渣可以替代水培生菜生产中 50%的矿物肥料。关键是要控制电导率并补充沼气渣中缺乏的养分，特别是镁。
