饼肥在植烟土壤中的矿化速率和腐殖化系数分析

The study on the mineralization rate and humification coefficient of cake fertilizer in soil of tobacco field

砂滤管试验结果表明,烟田土壤中饼肥的有机C、N分解快、易释放,前期（50 d内）释放N 71.03%-85.93%,占烟草全生育期N素释放量的79.67%-90.49%,满足了烟草最大吸收期对氮的需要;后期释放出较少的N量,既有利于烟叶成熟期落黄,又不会因缺肥造成烟叶早衰而影响品质,因此经发酵腐熟的饼肥N素释放规律符合烤烟对N素需求规律。饼肥的腐殖化系数较小。

The arenaceous basin experiment was done to study the mineralization and humitication regularity ot cake fertilizer m tobacco field . The results showed that the organic carbon and nitrogen of the cake fertilizer were mineralized easily. At former stage （in fifty days ）, 71.03% - 85.93% organic nitrogen was mineralized, that occupied 79.67% -90.49% decomposed organic nitrogen in the whole flue- cured tobacco growth period, to meet the need for tobacco growth with the sufficient nitrogen. The release of the less inorganic nitrogen could increase leaves burning up, and avoid leaves senescence because of the nutrition shortage at harvest stage. So the regularity of releasing N in compost cake fertilizer corresponded to that of flue - cured tobacco absorbing N. The humification coefficient was small, of cake fertilizer.