Abstract:

To better understand the soil fertility level at the county scale in Tibet, soil sampling analysis and fertility evaluation were carried out in Luolong County of Changdu City in Tibet. The quality of cultivated land in Luolong County was classified by fuzzy comprehensive evaluation method, 187 soil samples were collected in 11 towns of Luolong County. The values of 8 fertility indicators, including soil pH, and the content of soil organic matter, total nitrogen, total phosphorus, total potassium, alkaline hydrolysis nitrogen, available phosphorus and available potassium, were measured. The results showed that soil pH in Luolong County varied from neutral to alkaline. The content of soil organic matter and nitrogen were relatively rich. The total nitrogen content was high but the available nitrogen content was average. The total potassium content was average and the available potassium content was high. The content of soil total phosphorus and available phosphorus were low. Overall, the soil fertility level in Luolong County is above-average, but a quarter of the soil is low in fertility. In future agricultural production, we should pay attention to the improvement of soil fertility of low fertility soil.

Key words: Luolong County of Tibet, soil nutrient, soil fertility level, fuzzy comprehensive evaluation