Department of Biotechnology, Indian Institute of Technology Kharagpur, West Bengal 721302, India.
Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, West Bengal 721302, India.
Sci Total Environ. 2019 Sep 10;682:475-484. doi: 10.1016/j.scitotenv.2019.05.123. Epub 2019 May 16.
Intensive use of chemical fertilizer results in environmental pollution that disturbs the local ecosystem and causes reduction in the long-term crop yield. There is a need to explore the alternative source of plant nutrition such as de-oiled microalgal biomass as biofertilizer for sustainable production of food crops in a relatively pollution free environment. This study reports sustainable and improved agriculture of rice crop (cv. IR 36) by valorizing de-oiled microalgal biomass waste (DOMBW) of Scenedesmus sp., as eco-friendly fertilizer. The microalga (MA) was cultivated in open raceway pond using wastewater and flue gas. Performance evaluation and comparison of DOMBW with respect to growth and yield of rice plants vis-à-vis commercial chemical fertilizers (CF) and vermicompost (VC) applied individually or together, established the superiority of the former. The experiment comprised of five nutrient management treatments (CF, VC, MA, MA+CF and MA+VC) meeting 100% nitrogen (N) recommendation either through a single source or combined application in the soil. Combining the application of microalgal based organic fertilizer with chemical fertilizer (MA+CF), showed the highest performance in terms of plant height, tiller number, biomass, and grain yield. At the harvest stage, MA+CF also resulted in maximum plant dry weight, panicle weight, and 1000-grain weight in comparison to other treatments. This study revealed that the application of DOMBW as a biofertilizer is potentially sustainable and effective in improving the yields of rice crop with reduced use of chemical fertilizer.
过度使用化肥会导致环境污染，扰乱当地生态系统，并导致长期作物产量下降。因此，需要探索植物营养的替代来源，如脱油微藻生物质，作为生物肥料，以在相对无污染的环境中可持续生产粮食作物。本研究报告了通过利用 Scenedesmus sp. 的脱油微藻生物质废物（DOMBW）作为环保肥料，可持续地改善水稻（cv.IR36）的农业生产。使用废水和烟道气在开放式跑道池塘中培养微藻（MA）。对 DOMBW 相对于商业化肥（CF）和蚯蚓粪（VC）单独或联合施用对水稻生长和产量的影响进行了评估和比较，结果表明前者具有优越性。该实验包括五个养分管理处理（CF、VC、MA、MA+CF 和 MA+VC），通过单一来源或在土壤中联合应用，满足了 100%的氮（N）推荐量。将基于微藻的有机肥料与化肥（MA+CF）联合应用，在植物高度、分蘖数、生物量和籽粒产量方面表现出最高的性能。在收获阶段，与其他处理相比，MA+CF 还使植物干重、穗重和千粒重达到最大值。本研究表明，DOMBW 作为生物肥料的应用具有可持续性，并能有效提高水稻产量，同时减少化肥的使用。
