Tuyển tập các báo cáo nghiên cứu khoa học của trường đại học cần thơ trên tạp chí nghiên cứu khoa học đề tài: ẢNH HƯỞNG CỦA MẬT ĐỘ ĐẾN NĂNG SUẤT VÀ HIỆU QUẢ KINH TẾ CỦA MÔ HÌNH NUÔI TÔM CÀNG XANH (Macrobrachium rosenbergii ) LUÂN CANH VỚI LÚA. | Tạp chí Khoa học 2008 2 96-105 Trường Đại học Cần Thơ ẢNH HƯỞ NG C ỦA MẬT ĐỘ ĐẾN NĂ NG SUẤ T VÀ HIỆU QUẢ KINH TẾ CỦA Mô HÌNh nuôi tôm càng xanh Macrobrachium rosenbergii LUAN CANH VƠI LUA Nguyễn Thanh Phương Trần Thanh Hải1 và Nguyễn Quang Trung ABSTRACT The alternative culture of giant freshwater prawn Macrobrachium rosenbergii and rice has been being practiced the Mekong Delta for years. Optimal stocking density has been considered as a decisive factor affecting the profitability of the model. An on-farm trial was conducted with 4 treatments Including 3 6 8 and 10 PL m2 and each treatment was replicated 3 times. The experimental rice fields were in Co Do O Mon and Vinh Thanh districts of Can Tho city. The rice fields had a size of around 1 ha . Prawn were fed a combined diets of commercial pellet and fresh feed. The results showed that the water quality parameters temperature pH oxy H2S and N-NH4 were within the suitable ranges for the growth of prawn. The average individual weight of prawn varied with treatments from 38 6 to 70 5 g prawn and the animals in treatments of 3 6 and 8 PL m2 were significantly higher than that of treatment 10 PL m2. The productivity was increased as the stocking density increased the treatment of 3 PL m2 had the lowest productivity of534 kg ha while the highest was of treatment 10 PL m2 kg ha . The highest profit was with the treatment of 10 PL m2 VND 49 9 mil. ha but not significantly different if compared to the treatment of 6 PL m2 VND 40 8 mil. ha . The return on investment was highest with the treatment of 6 PL m2 . The stocking density of 6PL m2 would be the optimum for the alternative culture of prawn and rice. Keywords Giant freshwater prawn stocking density rice paddy Title Effects of stocking density of giant freshwater prawn Macrobrachium rosengergii on productivity and profitability of rice -prawn alternative culture system TÓM TẮT Mô hình nuôi tôm càng xanh Macrobrachium rosenbergii luân canh với trồng lúa hiện
