Phosphorus fractions and microbiological indicators in vineyards soils of a tropical semiarid setting in Brazil

IF 1.2 4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY
G. Fracetto, Eliabe de Morais Freitas, C. Nascimento, D. Silva, É. Medeiros, F. Fracetto, F. Silva, Lucia Helena Nunez Buzó, W. R. D. Silva
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Abstract

: Brazilian semi-arid tropical is responsible for the production and export of fine table grapes, but the demand for phosphate fertilizers and other agricultural inputs increases the cost of production and threatens local water bodies by leaching of phosphorus (P). The objectives of this study were to quantify the organic and inorganic fractions of P and to determine chemical and microbiological attributes related to its mineralization in soils cultivated with vines in São Francisco Valley. It was hypothesized that P fractions and microbial activity would increase in areas fertilized with phosphate. Soil samples from vines were collected in cultivated areas and in fallow systems. P fractionation, macro-elements analysis, microbial biomass phosphorus (Pmic), and phosphatase enzyme activity were determined and correlated with each other and with the total proportion of synthesized glomalin. In both treatments, the inorganic P fractions exceeded the organic ones, and the total phosphorus available in those soils was associated with the most recalcitrant fractions, reducing risks of leaching of this element and contamination of water bodies. Pmic was higher in the winery areas due to the presence of phosphate fertilizers and organic matter, hence the activity of alkaline phosphatase enzymes and the production of total glomalin increased respectively in three and four evaluated areas, indicating that P-mineralized bacteria and arbuscular mycorrhizal fungi have been positively affected by the current agricultural system.
巴西热带半干旱地区葡萄园土壤中的磷组分和微生物指标
巴西半干旱热带地区负责生产和出口优质的食用葡萄,但对磷肥和其他农业投入的需求增加了生产成本,并通过磷(P)的淋溶威胁到当地的水体。本研究的目的是量化磷的有机和无机部分,并确定与奥弗朗西斯科山谷葡萄种植土壤中磷矿化相关的化学和微生物属性。据推测,磷含量和微生物活性在施用磷肥的地区会增加。在耕地和休耕系统中采集了葡萄藤的土壤样本。测定磷分离、宏量元素分析、微生物生物量磷(Pmic)和磷酸酶活性,并与合成球囊素总比例进行相关性分析。在两种处理中,无机磷组分均超过有机磷组分,土壤中速效磷与最顽固的组分相关,降低了无机磷元素淋滤和水体污染的风险。由于磷肥和有机物的存在,Pmic在酒区较高,因此碱性磷酸酶的活性和总球球素的产量在3个和4个评价区分别增加,这表明磷矿化细菌和丛菌根真菌受到了当前农业系统的积极影响。
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来源期刊
Bragantia
Bragantia AGRICULTURE, MULTIDISCIPLINARY-
CiteScore
2.40
自引率
8.30%
发文量
33
审稿时长
4 weeks
期刊介绍: Bragantia é uma revista de ciências agronômicas editada pelo Instituto Agronômico da Agência Paulista de Tecnologia dos Agronegócios, da Secretaria de Agricultura e Abastecimento do Estado de São Paulo, com o objetivo de publicar trabalhos científicos originais que contribuam para o desenvolvimento das ciências agronômicas. A revista é publicada desde 1941, tornando-se semestral em 1984, quadrimestral em 2001 e trimestral em 2005. É filiada à Associação Brasileira de Editores Científicos (ABEC).
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