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Abstract
Organic fertilizers play a crucial role in promoting safe and sustainable agricultural practices. Therefore, this current investigation was to evaluate the effectiveness of combining inorganic and bio-organic fertilizers (BOF) on the growth and yield of water spinach (Ipomoea aquatica). The research was conducted at the experimental farm of Tra Vinh University from September 2023 to June 2024. In this research, the bio-organic fertilizer was produced by supplementing agricultural by-products with the fungal strain Trichoderma reesei CN4 VR11 and the bacterial strain Bacillus TC8-RL23. Five treatments, including different ratios ranging from 100% inorganic fertilizer to 100% BOF, were applied over two cropping seasons. Soil parameter analyses revealed that the treatments supplemented with BOF significantly increased organic matter content, total nitrogen, and available phosphorus compared to the control treatment (100% inorganic fertilizer). Furthermore, the findings also demonstrated statistically significant differences in leaf size, number of leaves, and plant height among the treatments and between the two cropping seasons. Notably, the treatment combining 50% inorganic fertilizer and 50% BOF yielded the highest water spinach production in the second crop. The findings support the potential of using BOF in water spinach cultivation to enhance yield, improve soil fertility, and reduce dependence on chemical fertilizers, thereby promoting the transition toward organic agriculture.
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