关键词: 春玉米, 春玉米, 土壤养分, 限制因子

Abstract:

In order to investigate nutrients in tobacco growing soils of Ningxiang County, 154 soil samples were collected and analyzed from 9 tobacco growing towns in Ningxiang County. The results showed that the average soil pH value was 5.79, the average contents of organic matter was 43.60 g/kg, available N was 174.38 mg/kg, available P was 19.38 mg/kg, available K was 87.81 mg/kg, exchangeable Mg was 1.36 cmol/kg, available B was 0.40 mg/kg, available Zn was 1.74 mg/kg, available S was 28.35 mg/kg. The pH value, available Z, available B and exchangeable Mg content were appropriate in tobacco-growing soil of the whole county. The content of organic matter and available N were higher. The content of available S and available P were superfluous in some tobacco-growing areas. The supply of available K was obviously deficient. The soil fertility characteristics had greater difference among different tobacco-growing towns. The fertilization suggestion of decreasing N, controlling P and S, increasing K, proper complementing micro-fertilizer in the tobacco-growing areas of Ningxiang County were recommended.