The effects of farmland management on soil physicochemical properties in an inland saline-alkali land were studied through household survey and indoor experiment.Results showed that there were the five crop planting modes of wheat—maize rotation

wheat—cotton rotation

melon—cotton interplant

maize—soybean interplant

and spring maize monoculture.The average contents of soil organic manure

alkali-hydrolyzable nitrogen

available phosphorus

and available potassium under the five planting modes were 20.1

60.1

106.2

and 170.2 mg/kg

respectively.The differences between the planting modes were significant and the soil nutrient contents were the highest under the melon—cotton interplant mode.Under the different planting modes

the highest content of soil alkali-hydrolyzable nitrogen was only 70.2 mg/kg

which suggests that nitrogen fertilizer should be added;the average content of soil available phosphorus was 15 mg/kg higher than what the plants need

which implies that phosphorus fertilizer should be reduced;and the average content of available K was 170.2 mg/kg

which implies that K fertilizer should be controlled according to the needs of crops.