The relationships between the natural quality grade of arable land and main soil fertility indicators

【Objective】The relationships between arable land natural quality grade and main soil fertility indicators were studied. 【Method】Arable land quality monitoring indicators and the soil fertility indicators were investigated after the study area was divided into four monitoring partitions and 38 sampling points were laid, based on the work of Huazhou arable land quality grade monitoring. 【Result and conclusion】The results showed that the mathematical relationship between the arable land quality level（y） and the main soil fertility indicators［pH(x₁)； available nitrogen content(x₂)］ was y =1 300.15+630.33 x₁+3.24x₂. pH and available nitrogen significantly are correlated with ten original monitoring indicators of arable land, and the two fertility indicators and the natural quality grade index also have a significant linear relationship.