前茬作物对富源县植烟土壤养分的影响

Effect of previous crops on tobacco planting soil nutrients in Fuyuan County

对富源县低、中、高海拔烟区植烟土壤养分测定表明,各海拔段烟区植烟土壤全钾和全磷含量较低,均处于中等偏下水平。在各海拔段植烟土壤种植不同前茬作物,并测定前茬作物对植烟土壤综合肥力的影响。结果表明,低海拔(<1 700m)烟区前茬为豌豆时,土壤肥力最高,但应补充氮素;中海拔(1 700-2 000 m)烟区前茬为空闲时,土壤肥力最高,但应控制水溶性氯含量;高海拔(>2 000 m)烟区前茬为油菜时,土壤肥力最高,但应控制土壤中有效硫和水溶性氯的含量。

The soil nutrition and fertility have been analyzed following different preceding crops and at different altitudes in Fuyuan County. The results showed that the total contents for both potassium and phosphorus were generally low at all altitudes,below an average medium-low level. To determine the effect of previous crops on tobacco soil nutrition and fertility,various crops were grown prior to tobacco production at three altitudes（ low,middle,and high）. At low altitude（ 1 700 m）,the highest level of soil fertility was observed following a pea crop with some supplement of nitrogen. At middle altitude（ 〈1 700- 2 000 m）,the highest level of soil fertility was found on fallow lands with no prior crop. On these soils,there was a need to control the water-soluble chloride content. At high altitude（ 〉2 000 m）,the highest level of soil fertility was achieved on lands following a rapeseed crop; however,farmers should control the level of available sulfur and water-soluble chloride in the soil before growing tobacco plants.