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Journal of Agriculture ›› 2025, Vol. 15 ›› Issue (10): 18-27.doi: 10.11923/j.issn.2095-4050.cjas2024-0166

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Research on Quality Grade of Cultivated Land and Soil Nutrient Characteristics in Kongtong District Based on GIS

ZHANG Tao(), LIU Yuanyuan(), LI Yaru, HOU Qian   

  1. Agricultural Technology Extension Station of Kongtong District, Pingliang City, Pingliang Gansu 744000
  • Received:2024-08-14 Revised:2024-12-20 Online:2025-10-20 Published:2025-10-17

Abstract:

The study aimed to master the quality grade and soil nutrient characteristics of cultivated land in Kongtong District, Pingliang City, Gansu Province, and to provide scientific basis for the future management, protection and utilization of cultivated land quality. Using the cultivated land quality grade evaluation data of 2021 in Kongtong District, the cultivated land quality grade and soil nutrient characteristics in the region were studied based on GIS technology. The results showed that the cultivated land quality in Kongtong District was generally low, and the cultivated land was distributed from 4th grade to 10th grade, the 8th grade land was the main cultivated land. Among them, the 4th to 6th grade land accounted for 33.58% of the total area of cultivated land, they were mainly distributed in Sishilipu Town, Baishui Town, Huasuo Town, Caofeng Town, Dazhai Town, Daqin Town and Xiamen Town; the 7th to 10th grade land accounted for 66.42% of the total area of cultivated land, they were mainly distributed in Caofeng Town, Dazhai Town, Suoluo Town, Sishilipu Town, Anguo Town, Xiyang Town, Mawu Town and Xiamen Town. The soil organic matter content of cultivated land in Kongtong District was mostly at the low level, with an average content of 14.99 g/kg; the total nitrogen content was mostly at the low and lower levels, with an average content of 0.78 g/kg; the available phosphorus content was mostly at the low and medium level, with an average content of 17.98 mg/kg; the content of available potassium was mostly at the high level, with an average content of 318.67 mg/kg. Among the main soil types, the average content of organic matter and total nitrogen in silted soil was the lowest, while the average content of available phosphorus and available potassium in black loessial soil was the lowest. The key for improving the quality of cultivated land in Kongtong District lies in increasing the application of organic fertilizer, improving nitrogen fertilizer utilization efficiency, intensifying efforts to improve medium and low yield fields, implementing the cultivated land rotation fallow system in line with the actual situation in Kongtong District, improving the degree of intensive use of cultivated land, and promoting the sustainable use of cultivated land resources.

Key words: Kongtong District, cultivated land quality, grade evaluation, GIS technology, soil nutrient characteristics, rotation and fallowing