Ảnh hưởng của tỷ lệ nh4+/no3- đến khả năng ổn định ph của dung dịch và khả năng sinh trưởng của rau muống thủy canh / ẢNH HƯỞNG CỦA TỶ LỆ NPK TỚI MỘT SỐ CHỈ TIÊU HÓA SINH VÀ SỰ RA HOA CỦA CÂY LAN DENDROBIUM LÙN (Dendrobium sp.)

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Tác giả: Thị Hải Yến Bùi, Phi Bằng Cao, Thị Bích Ngọc Chu, Thị Bích Thảo Hoàng, Thị Mận Lê, Phương Quý Nguyễn, Thị Thanh Hương Nguyễn, Thị Mai Lan Trần, Thị Thanh Huyền Trần, Trung Kiên Trần, Văn Điền Trần

Ngôn ngữ: vie

Ký hiệu phân loại: 631 Specific techniques; apparatus, equipment, materials

Thông tin xuất bản: Tạp chí nông nghiệp và phát triển nông thôn, Tạp chí Khoa học và Công nghệ Đại học Thái Nguyên, 20132019

Mô tả vật lý: 115-122

Bộ sưu tập: Metadata

ID: 482714

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Effects of NH4+/NO3- ratios on pH stability of the nubient solution and growth of water spinach in noncirculating hydroponic system were studied under both pH control and non- pH control conditions. With pH control condition, pH of the nubient solutions was adjusted to 5.5 every 3 days throughout plant growth. Two week-old seedlings of water spinaches were grown in soft bucket containing 20L of nubient solution with different NH4+/ NO3- ratios (100:00,75:25, 50:50, 25:75 and 00:100) as treatments. The results showed that water spinach supplied with NO3- as its sole N source (00:100 treatment) grew best under pH control condition, but grew poorly in non-pH control condition. Nubient solution pH of this treatment in non- pH control condition dramatically increased and this possibly affected on the availability of the nubient elements in this treatment, and hence causing poor plant growth. When 100 percent N was supplied in the form of NH4+ water spinach grew worst regardless of pH-control or non-pH control condition, indicating that high NH4+ level was possibly toxic to the plants. In non- pH control condition, the nubient solution pH of 100 percent NH4+ treatment was strongly decreased to less than 4.0. In the NH4+/NO3- ratio of 25:75, the plants grew best both in pH-control and non-pH control conditions. The nubient solution pH of this treatment is stable at pH range of 5.0-5.5, properly for plants growth in hydroponic culture. When propotion of NH4+ further increased, the growth of water spinach decreased. This study indicated that water spinach can grow very well in non-circulating hydroponic system without controlling nubient solution pH throughout the plant growth when 25 percent of NO3- was replaced by NH4+. This replacement also helped to decrease NO3- content in the plants.Dinh dưỡng có ảnh hưởng lớn tới sinh lí, hóa sinh của thực vật. Công trình này hướng tới nghiên cứu ảnh hưởng của các chế phẩm NPK tới một số chỉ tiêu hóa sinh và sự ra hoa của cây lan Dendrobium lùn (Dendrobium sp.). Trong nghiên cứu này, các chế phẩm NPK khác nhau được phun qua lá gồm các công thức thí nghiệm CT1 (10:30:10), CT2 (10:10:30), CT3 (6:30:30), CT4 (10:30:30). Kết quả nghiên cứu cho thấy rằng cả bốn chế phẩm NPK đều có tác động làm tăng hoạt độ catalase và peroxidase, hai trong số các enzym xúc tác phân giải H2O2 ở thực vật. Đồng thời, khi xử lí NPK đã có tác động làm tăng tỷ lệ ra hoa, rút ngắn tời gian ra hoa ở cây lan Dendrobium lùn so với ở cây không được xử lí. Kết quả nghiên cứu cũng chỉ ra rằng bổ sung NPK đã làm tăng chiều dài ngồng hoa, số lượng hoa/ngồng và kích thước hoa. Trong đó, chế phẩm NPK=6:30:30 làm cây lan Dendrobium lùn ra hoa với tỷ lệ 100%. Hai chế phẩm NPK = 6:30:30 và 10:30:30 làm tăng chiều dài ngồng hoa, số lượng hoa/ngồng và kích thước hoa lớn nhất. Kết quả nghiên cứu này gợi ý NPK=10:30:30 và 6:30:30 có thể được sử dụng trong chăm sóc phong lan Dendrobium lùn.

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