Ảnh hưởng của quản lý sinh khối cỏ Vetiver và cây Đậu tương DT2008 đến tích lũy C, N và cải thiện tính chất đất trồng cây có múi ở Cao Phong, Hòa Bình=Impacts of Vetiver Grass and DT2008 Soybean Cover Crop Practices on Soil Quality in Citrus Orchards in Cao Phong, Hoa Binh

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Tác giả: Thị Tuyết Thu Trần

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học Trái đất và Môi trường, 2024

Mô tả vật lý: tr.15-25

Bộ sưu tập: Metadata

ID: 474383

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Nghiên cứu này đã thực hiện 6 thí nghiệm trong chậu để đánh giá ảnh hưởng của biện pháp quản lý sinh khối, chất lượng tàn dư và tỷ lệ sinh khối cỏ Vetiver và cây Đậu tương DT2008 đến hiệu quả tích lũy Carbon (C), Nitrogen (N) và các tính chất của đất. Thí nghiệm gồm 6 công thức, mỗi công thức được lặp lại ba lần: CT0 (đối chứng), CT1 phủ 2% SKVetiver, CT2 phủ 2% SKDT2008, CT3 phủ 1% SKVetiver và 1% SKDT2008, CT4 vùi 1% SKVetiver và 1% SKDT2008, và CT5 vùi 2% SKDT2008. Kết quả sau 12 tháng bổ sung sinh khối, tổng lượng C, N và axit mùn (humic, fulvic) tăng lên đáng kể, đồng thời, một số tính chất đất được cải thiện. Hàm lượng C, N, axit mùn và dung tích trao đổi cation của đất (CEC) được cải thiện tốt nhất ở công thức CT5 và CT4. Ngược lại, độ ẩm đất, pHH2O, pHKCl và độ chua thủy phân lại cao hơn ở công thức CT1, CT2 và CT3. Hiệu suất tích lũy N thấp, dao động từ 24,44% đến 86,67%, trong khi hiệu suất tích lũy C cao hơn, đạt từ 41,94% đến 91,72%. Biện pháp hiệu quả nhất là vùi sinh khối cây Đậu tương DT2008 vào đất hoặc phủ cỏ Vetiver lên trên lớp sinh khối cây Đậu tương. Cỏ Vetiver nên được sử dụng để che phủ nhằm cải thiện và bảo vệ độ phì đất.This study investigated the efficiency of biomass management, residue quantity, and quality from Vetiver grass and DT2008 soybean cover crops in improving soil quality, including carbon and nitrogen content and soil physiochemical properties. Mesocosm experiments in pots were conducted with six treatments, each was replicated three times: CT0 (control), CT1 (2% Vetiver grass mulch), CT2 (2% DT2008 mulch), CT3 (1% Vetiver grass and 1% DT2008 mulch), CT4 (1% Vetiver grass and 1% DT2008 buried), and CT5 (2% DT2008 buried). After 12 months, significant increases in total carbon, nitrogen, and humic and fulvic acids were observed, indicating enhanced soil physiochemical properties. CT5 and CT4 showed the highest carbon, nitrogen, and cation exchange capacity (CEC) improvements. Soil moisture, pH in water (pHH2O), pH in KCl (pHKCl), and hydrolytic acidity were higher in CT1, CT2, and CT3. Nitrogen accumulation efficiency was relatively lower than carbon (24.44% to 86.67%), while carbon accumulation efficiency was much higher (41.94% to 91.72%). The most effective methods were to bury soybean biomass or mulch Vetiver grass over a soybean plant mulching layer, with Vetiver grass mulch recommended for enhancing and conserving soil fertility.

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