Xác định mối tương quan giữa đặc tính với màu sắc đất của tỉnh Vĩnh Long
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Abstract
The study aims to determine the correlation between soil physical and chemical properties and soil color in Vinh Long province. It utilizes data from the analysis of 50 soil samples, including soil color classification using the Munsell color system and 12 physicochemical soil indicators. The results show that the soils in the study area are highly nutrient-rich, especially in organic matter and nitrogen, with soil hues (Hue) of (2.5Y; 7.5YR; 10YR), lightness (Value) ranging from 2 to 6 at medium to high levels, and chroma (Chroma) mainly at level 1, indicating dark-colored soils. Linear correlation analysis identified 17 pairs of soil properties that correlate with soil color, including % Sand, % Silt, % Clay, pH(H₂O), pH(KCl), and organic matter content (OM), with the highest correlation found between OM and Value at a Hue of 10YR. These correlations can help predict certain soil properties based on soil color data, thereby reducing analysis costs and time. However, soil color is often influenced by other factors such as moisture, soil texture, organic matter content, light source, and accuracy in color matching.
Tóm tắt
Nghiên cứu được thực hiện nhằm xác định tương quan giữa đặc tính lý hóa học đất với màu sắc đất tại tỉnh Vĩnh Long. Số liệu phân tích 50 mẫu đất được kế thừa gồm: so màu sắc đất bằng hệ thống màu Munsell và 12 chỉ tiêu lý hóa học đất. Kết quả cho thấy, đất khu vực nghiên cứu rất giàu dinh dưỡng, đặc biệt là chất hữu cơ và đạm với sắc đất (Hue) là (2,5Y; 7,5YR; 10YR), độ sáng (Value) từ 2 đến 6, ở mức trung bình đến cao, độ tinh khiết (Chroma) chủ yếu là mức 1, đất màu sẫm. Tương quan tuyến tính được phân tích và xác định được 17 cặp đặc tính đất có tương quan tuyến tính với màu sắc đất bao gồm % cát, % thịt, % sét, pH(H2O), pH(KCl), và hàm lượng chất hữu cơ (CHC), trong đó mối tương quan cao nhất là giữa CHC với Value khi Hue là 10 YR. Các mối tương quan này có thể ước đoán được một số chỉ tiêu thổ nhưỡng từ dữ liệu so màu đất, từ đó giảm thiểu chi phí và thời gian phân tích. Tuy nhiên, màu sắc đất thường bị ảnh hưởng bởi các yếu tố khác như ẩm độ, thành phần cơ giới, hàm lượng chất hữu cơ, nguồn ánh sáng và mức độ chính xác khi so màu.
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