Abstract

Intensive Pangasius aquaculture farming contributes to increased income and profits in Vietnam, but is also associated with many environmental problems, including pollution from nutrient-rich water and sediments that are released into the environment. This article investigates the feasibility of using Pangasius pond sediments (PPS) in combination with amendments of rice straw (RS) to fertilize cucumber (Cucumis sativus L.) and water spinach (Ipomoea aquatica Forssk) plant. The results showed that mixing a ratio of 30% PPS with 70% RS produced the highest nutrient concentrations. The study demonstrates that organic fertilizer produced from PPS in combination with chemical fertilizer can replace 2575% of the inorganic fertilizers used as a nutrient source for cucumber and water spinach, and also increase the vegetable production. The highest yields were found for treatment PPS_-3 (a combination of 50% chemical fertilizer and 50% organic fertilizer used on cucumber), and for treatment PPS_RS-4 (a combination of 25% chemical fertilizer and 75% organic fertilizer used on water spinach) in both the wet and dry season (P˂0.05). The lowest yields were found when growing cucumbers and water spinach either with 100% organic fertilizer (the treatment PPS_-5) or with 100% chemical fertilizer (the control treatment PPS_-1), respectively (P˂0.05). Overall, the results indicated that the recycling of PPS as organic fertilizer and chemical fertilizer in combination for vegetable cultivation is more environmentally friendly as compared to using only chemical fertilizers.

Graphic abstract

摘要

密集的Pangasius水产养殖业有助于增加越南的收入和利润，但也与许多环境问题有关，包括营养丰富的水和沉积物释放到环境中造成的污染。本文研究了使用Pangasius池塘沉积物（PPS）结合稻草（RS）改良黄瓜（Cucumis sativus L.）和水菠菜（Ipomoea aquatica）的可行性。Forssk）工厂。结果表明，将30％PPS与70％RS混合可产生最高的营养素浓度。研究表明，由PPS结合化学肥料生产的有机肥料可以替代2575％用作黄瓜和水菠菜营养源的无机肥料，还可以提高蔬菜产量。在PPS _-3处理（黄瓜上使用50％化学肥料和50％有机肥料的组合）和PPS _RS-4处理（在黄瓜上使用25％化学肥料和75％有机肥料的组合）时，发现最高产量。水菠菜）在干湿两季（P˂0.05）。用100％的有机肥料（治疗PPS种植黄瓜和水菠菜当任一被发现的最低产率_-5）或具有100％的化学肥料（对照处理PPS _-1），分别为（P ˂0.05）。总体而言，结果表明，与仅使用化学肥料相比，将PPS作为有机肥料和化学肥料结合用于蔬菜种植的回收利用对环境更加友好。

图形摘要