相同碳氮比有机物料矿化1年对植烟土壤养分的影响

为探索不同有机物料相同碳氮比矿化1年对植烟土壤肥效作用,通过盆栽试验,将猪粪、玉米秸秆和生物炭调节碳氮比为25:1,经过1年自然矿化后在添加基础肥料的基础上分析不同有机物料对植烟土壤酶活性及氮磷钾含量的影响。结果表明,猪粪和玉米秸秆分别显著提高了土壤脲酶(最大值2.91 mg/(g·d))和蔗糖酶活性(最大值17.02 mg/(g·d))。与对照(不施有机物料)相比,施用有机物料在自然矿化1年后对土壤氮素仍有显著提升作用,其中猪粪处理表现出明显优势。同时,猪粪与生物炭显著提高了土壤速效钾和有机质含量,最大值分别达到1101 mg/kg和54.56 g/kg;猪粪也明显提升了土壤速效磷含量(727.95 mg/kg)。综上所述,相同碳氮比下豫中烟区土壤施用猪粪和生物炭在自然矿化1年后对植烟土壤养分含量的提升作用显著。

Organic Material After One Year Mineralization Under Same C/N Ratio: The Effect on Soil Nutrients

The paper aims to explore the delayed effect of different types of organic material after one year mineralization. A pot experiment was carried out with four treatments: (1) without organic material application (TCK); (2) adding maize straw (TS); (3) adding pig manure (TM); (4) adding biochar (TB). Carbon/nitrogen (C/N) of all the four treatments were adjusted as 25:1 in the first year. After a year of mineralization, the major indexes of soil nutrients were measured and analyzed. The results showed that manure and maize straw significantly improved the activity of soil enzymes that related to C and N metabolism. The soil urease activity was significantly enhanced under TM treatment with the maximum value of 2.91 mg/(g·d); while the highest activity of soil sucrose appeared on TS treatment [17.02 mg/(g·d)]. Compared to TCK, the application of organic materials could improve soil nitrogen content after a year of mineralization. Therein, all the forms of soil nitrogen significantly increased under TM. Meanwhile, the content of soil available potassium and organic carbon remarkably increased under the TM and TB treatments with the max value of 1101 mg/kg and 54.56 g/kg, respectively. The max value of soil available phosphorus was found under TM (i.e.727.95 mg/kg). In brief, after a year of mineralization with the same C/N ratio, pig manure and biochar application can significantly improve soil nutrient content in tobacco-planting area of central Henan Province.