Hiệu quả của hai dòng vi khuẩn Curtobacterium citreum HH5 và Curtobacterium luteum MT6 lên sinh trưởng, năng suất cải xanh (Brassica juncea) và đặc tính đất ở thực tế đồng ruộng tại thành phố Cần Thơ
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Abstract
The study aimed to evaluate the efficacy of two bacterial strains, Curtobacterium citreum HH5 and Curtobacterium luteum MT6, on the growth, yield of mustard greens, and soil properties in Can Tho City. The experiment was arranged in a completely randomized block design with 5 treatments and 4 replications. The results of three experimental crops showed that the two bacterial strains MT6 and HH5 helped reduce 25% of chemical fertilizers, while improving plant height, leaf length, leaf SPAD index, yield and dry biomass of mustard greens, especially helping to reduce the nitrate content accumulated in the stem. The MT6 bacterial strain stimulated root length, increased yield and dry biomass better than the HH5 bacterial strain. Both bacterial strains helped improve P-avail., EC and pH in the soil compared to the treatment with only chemical fertilizers. In particular, the MT6 bacterial strain helped increase P-total in the stem and P-avail. in the soil. In addition, the treatments with the bacterial strain also improved the numbers of nitrogen-fixing bacteria, phosphorus and silicon solubilizing bacteria in the soil.
Tóm tắt
Nghiên cứu được thực hiện nhằm đánh giá hiệu quả của hai dòng vi khuẩn Curtobacterium citreum HH5 và Curtobacterium luteum MT6 lên sinh trưởng, năng suất của cải xanh và đặc tính đất tại Thành phố Cần Thơ. Thí nghiệm được bố trí khối hoàn toàn ngẫu nhiên với 5 nghiệm thức và 4 lần lặp lại. Kết quả qua ba vụ thí nghiệm cho thấy, hai dòng vi khuẩn MT6 và HH5 giúp giảm 25% phân bón hóa học, đồng thời cải thiện chiều cao cây, chiều dài lá, chỉ số SPAD của lá, năng suất và sinh khối khô của cải xanh, đặc biệt giúp giảm hàm lượng nitrat tích lũy trong thân cây. Dòng vi khuẩn MT6 kích thích chiều dài rễ, tăng năng suất và sinh khối khô tốt hơn dòng vi khuẩn HH5. Cả hai dòng vi khuẩn đều giúp cải thiện P hữu dụng, EC và pH trong đất so với nghiệm thức chỉ bón phân hóa học. Đặc biệt, dòng vi khuẩn MT6 giúp tăng Pts trong thân và Phd trong đất. Ngoài ra, các nghiệm thức có chủng vi khuẩn cũng giúp cải thiện mật số vi khuẩn cố định đạm, hòa tan lân và silic trong đất.
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