Sharma Gulshan Kumar, Khan Shakeel Ahmad, Shrivastava Manoj, Bhattacharyya Ranjan, Sharma Anil, Gupta Dipak Kumar, Kishore Prabhat, Gupta Navindu
Division of Environmental Sciences, Centre for Environmental Science and Climate Resilient Agriculture, ICAR- Indian Agricultural Research Institute, Pusa, New Delhi, 110012, India; ICAR- National Bureau of Soil Survey and Land Use Planning, Regional Centre, Jorhat, 785004, Assam, India.
Division of Environmental Sciences, Centre for Environmental Science and Climate Resilient Agriculture, ICAR- Indian Agricultural Research Institute, Pusa, New Delhi, 110012, India.
J Environ Manage. 2021 Jun 1;287:112295. doi: 10.1016/j.jenvman.2021.112295. Epub 2021 Mar 8.
There is an urgent need to meet the demand of water and nutrients by their reuse and recycling to gratify sustainable food production system and resource conservation. Chlorella minutissima was found to be very effective in the removal of electrical conductivity (EC), total dissolved solids, phosphorous (P), potassium (K), ammonium, nitrate, biological oxygen demand (BOD) and chemical oxygen demand (COD) of sewage wastewater. We tested the effects of phycoremediated algal biomass addition to soil in field plots of baby corn and spinach, on plant growth, yield and soil chemical properties. The application of 100% nitrogen (N) fertilizer by algal biomass lead to higher economic yield of spinach and baby corn than recommended dose of mineral fertilizers. The available N and P content in experimental plots applied with algae biomass as biofertilizers were significantly higher than other treatments. The soil enzymes, such as urease, nitrate reductase, and dehydrogenase were analysed during the cropping season of baby corn and spinach. The soil supplied with 100% N by algae biomass (C. minutissima) significantly (P < 0.05) increased the dehydrogenase activity in spinach grown soil. While the nitrate reductase activity in soil supplied with algal manure was maximum (0.13 mg NO-N produced g soil 24 h) and significantly higher than other treatments in baby corn grown soil. This study revealed that phycoremediation coupled with biofertilizers production from algae biomass is a recycling and resource conservation exercise to reduce eutrophication, recycling of wastewater, recycling of plant nutrients and improvement of the soil quality in circular economy fertilization.
迫切需要通过水和养分的再利用和循环利用来满足其需求，以实现可持续的粮食生产系统和资源保护。已发现极小绿藻在去除污水废水的电导率（EC）、总溶解固体、磷（P）、钾（K）、铵、硝酸盐、生物需氧量（BOD）和化学需氧量（COD）方面非常有效。我们测试了在甜玉米和菠菜的田间地块中，将藻类生物量进行藻类修复后添加到土壤中，对植物生长、产量和土壤化学性质的影响。与推荐剂量的矿物肥料相比，通过藻类生物量施用100%的氮肥可使菠菜和甜玉米获得更高的经济产量。以藻类生物量作为生物肥料的试验地块中，有效氮和磷的含量显著高于其他处理。在甜玉米和菠菜的种植季节对土壤酶，如脲酶、硝酸还原酶和脱氢酶进行了分析。通过藻类生物量（极小绿藻）提供100%氮的土壤显著（P<0.05）提高了菠菜种植土壤中的脱氢酶活性。而在甜玉米种植土壤中，施用藻类肥料的土壤中硝酸还原酶活性最高（每克土壤24小时产生0.13毫克NO-N），且显著高于其他处理。这项研究表明，藻类修复与藻类生物量生产生物肥料相结合，是一种在循环经济施肥中减少富营养化、废水循环利用、植物养分循环利用和改善土壤质量的回收和资源保护活动。
