EFFECT OF SOIL COMPACTION AND CO-INOCULATION WITH Azospirillum brasilense ON THE DEVELOPMENT OF PEANUT PLANTS

ABSTRACT The aim of this study was to evaluate the effect of inoculation with rhizobium and co -inoculation with Azospirillum brasilense on phytometric characteristics of peanut plants grown in Latossolo Vermelho (Oxisol) with and without compaction. The experiment was conducted in a greenhouse, with a randomized block design in a 5x2 factorial scheme and 4 replicates, totaling 40 experimental units. Treatments were composed by commercial inoculant for peanuts (SEMIA 6144 strain); MT 15 strain; combination of MT 15 + A. brasilense; nitrogen control and absolute control. Plant height, number of leaves, number of branches per plant, stem diameter and Falker chlorophyll index were evaluated. The data were subjected to analysis of variance and, when significant, to Tukey test at 1% probability level. For the variables plant height, number of leaves, number of branches and stem diameter, the results were similar for all treatments, except for the absolute control and number of branches at 90 days after emergence (DAE) and stem diameter at 30 and 90 DAE. For stem diameter at 30 DAE, the results were similar to those found in the treatments with co -inoculation, commercial inoculant and nitrogen fertilization. There was interaction for Falker chlorophyll index at 60 DAE, with the best result found in the MT 15 strain. Inoculation with MT15 and co-inoculation with A. brasilense promoted good performance in peanut crop in terms of phytometric characteristics in soil with and without compaction.

摘要
本研究旨在评估根瘤菌接种以及与巴西固氮螺菌（Azospirillum brasilense）联合接种，对在压实与未压实深红砖红壤（Latossolo Vermelho，Oxisol，氧化土）中种植的花生植株的植株形态测量性状的影响。本试验于温室中开展，采用5×2因子设计的随机区组设计，设置4次重复，共计40个试验单元。
试验处理包括：花生商用根瘤菌接种剂（SEMIA 6144菌株）、MT 15菌株、MT 15 + 巴西固氮螺菌联合接种、氮素对照以及空白对照。测定指标包括株高、单株叶片数、单株分枝数、茎粗以及Falker叶绿素指数（Falker chlorophyll index）。
对数据进行方差分析，若差异显著则采用1%显著性水平的Tukey多重比较检验。就株高、单株叶片数、单株分枝数以及茎粗这几项指标而言，除空白对照组与出苗后天数（Days After Emergence，DAE）90天时的单株分枝数、出苗后天数30天和90天时的茎粗外，其余各处理的测定结果无显著差异。出苗后天数30天时的茎粗指标，联合接种组、商用接种剂组与氮肥处理组的测定结果无显著差异。出苗后天数60天时的Falker叶绿素指数存在交互效应，其中MT 15菌株处理组的效果最优。无论土壤是否压实，接种MT15菌株以及联合接种巴西固氮螺菌均可提升花生植株的形态测量性状表现。