大麦掩青量对烟草土壤养分的影响

采用大田试验,对大麦掩青的矿化规律及大麦掩青量对烟草土壤养分的影响进行了较为系统的研究,研究结果表明:大麦掩埋后有机碳和氮的矿化速率的变化趋势基本一致,均分为3个阶段:快速分解期、渐缓分解期、缓慢分解期。大麦掩青量的增加能够提高土壤中速效氮含量,效果为T4>T3>T2>T1>CK。同时掩青量的增加提高了土壤中速效磷含量,T4效果最为明显。在整个生育时期,各处理土壤速效钾含量一致下降,大麦掩青提高了土壤中速效钾的含量,各处理不同时期土壤速效钾含量大小顺序为T4>T3>T2>T1>CK。大麦掩青条件下土壤中活性有机质含量变化较为明显,在移栽后75 d内,T4的土壤活性有机质含量一直增高,而其它处理则呈下降趋势。在整个生育期间,各处理土壤中活性有机质含量大小顺序均为T4>T3>T2>T1>CK。

Effects of Barley Buried Quantity on Nutrient Accumulation in Soil of Tobacco Field

Through field experiment,the rule of barley mineralization and effects of barley buried quantity on the soil nutrition of tobacco field were studied systematically.The results showed that the changeable trend of organic C and N in the soil was similar after barley was buried,and they all could be divided into three stages： fast decomposition stage,gradually slow decomposition stage and slow decomposition stage.Increasing barley buried quantity could enhance the content of available nitrogen in the soil,and the effect was showed： T4T3T2T1CK.Increasing barley buried quantity also could enhance the content of available phosphorus in the soil,and treatment T4 had the most obvious effect.The content of available potassium in the soil in all treatments decreased at the whole growth stage,the increase of barley buried quantity could enhance the content of available potassium in the soil,and the rule of the available potassium content in the soil at every stage was showed as follows： T4T3T2T1CK.The content of active organic matter had great changes under the condition of burying barley,it increased continually in treatment T4 within 75 d after transplanting,while it appeared the decreasing trend in other treatments.The rule of the active organic matter content at the whole growth stage was showed： T4T3T2T1CK.