长江流域油菜田土壤硫肥力现状研究

选择长江流域油菜产区研究安徽省土壤缺S现状和油菜植株硫营养状况。结果表明,安徽省长江流域油菜产区,土壤有效S平均含量15.31mgkg-1,缺S状况较为严重,缺S土壤所占比例高达63.10%,潜在性缺S土壤所占比例为35.48%。主要土壤类型中灰潮土缺S状况最为严重,有效S不足的土壤所占比例高达80%。油菜植株全S含量为5.08~20.18gkg-1,平均10.02gkg-1。花和叶含S量较高,全S含量平均为11.06gkg-1和11.00gkg-1,茎杆含S量较低,全S平均含量仅8.00gkg-1。油菜花朵和叶片全S含量多在8~16gkg-1,茎杆含S量在6~10gkg-1之间。花、叶、茎全S含量(y)与土壤有效S含量(x)之间呈极显著二次曲线正相关,回归方程分别为y1=3.79782+0.88501x-0.02265x2(R2=0.4156**,F=9.96,n=31),y2=3.6548+0.86280x-0.02111x2(R2=0.26569**,F=5.07),y3=3.78016+0.45330x-0.00981x2(R2=0.34399**,F=7.32)。

The Present Situations of Soil Sulfur Fertility in Rapeseed Field of the Yangtze River Valley

Rapeseed production district in the Yangtze River valley Anhui province was selected to study the present situation of soil available sulfur and status of sulfur nutrient of the rapeseed.Results showed that the average content of soil available sulfur (S) in rapeseed production region of Yangtze River valley Anhui province was 15.31mg kg~(-1), the status of sulfur was insufficient seriousl.The proportion of soil that was insufficient in sulfur took 63.10% of the total, and the one that was potential deficient in sulfur 35.48%. Among the category of important soils,gray-alluvial meadow soil was the most deficient in sulfur, and the proportion of soil available sulfur being insufficient reached 80%. The content of total sulfur in rape plant was 5.0820.18g kg~(-1) with the average 10.02g kg~(-1). Total sulfur content in flower and leaf was higher and lower in stem, the average content of total sulfur being 11.06g kg~(-1), 11.00g kg~(-1) and 8.00g kg~(-1),respectively. The majority of total sulfur content in flower and leaf lay between 816g kg~(-1) and in stem 610g kg~(-1). There was a positive relation of quadratic curve between total content of sulfur in flower, leaf and stem (Y) and available sulfur content in soils (X).The regression equations were y_1=3.79782 0.88501x-0.02265x~2(R~2=(0.4156~(**)),F=9.96,n=31),y_2=3.6548 0.86280x-0.02111x~2(R~2=0.26569~(**),F=5.07),y_3=3.78016 (0.45330x)-0.00981x~2(R~2=0.34399~(**),F=7.32),respectively.