Weed Interference in Soybean Crop Affects Soil Microbial Activity and Biomass

IF 0.8 Q3 Agricultural and Biological Sciences
C. Fialho, A. Silva, C. Melo, M. Costa, M. Souza, L. Reis
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引用次数: 1

Abstract

ABSTRACT: Weeds and microorganisms interacting with their rhizosphere may influence nutrient absorption, which is an important factor for plant competition. The purpose of this study was to evaluate the microbiological activity, inorganic phosphorus solubilization (Pi) and acid phosphatase in the cultivated soil, in a combination of soybean (Glycine max) plants and weeds. Soybeans were cultivated in monoculture and in competition with Bidens pilosa, Brachiaria decumbens (Syn. Urochloa decumbens) and Eleusine indica, under two conditions: a) plants competing without contact between the roots b) plants competing with contact between the roots. A nylon screen with a 50 µm mesh was added to prevent contact between the roots of the species in competition so that the substratum could be separated in the vase. The experiment was conducted in randomized blocks, with four replications. The soybeans in competition with weeds led to lower oxidation of organic matter per unit of microbial biomass, resulting in a lower metabolic quotient, compared with the soybean monoculture. The contact between soybean roots and B. pilosa, B. decumbens and E. indica maintained a strong influence, raising the solubilization of Pi, respectively valued at 51, 39 and 31% in relation to the cultivation of each species with a nylon screen. Microbiological activity, inorganic phosphorus solubilization and acid phosphatase were altered by plant species, combinations of weeds and soybean plants in competition; by root contact in some cases. Thus, the microbiological activity of the soil can influence competition strategies and plant development.
杂草干扰对大豆作物土壤微生物活性和生物量的影响
摘要:杂草及其根际微生物相互作用影响养分吸收,是植物竞争的重要因素。本研究旨在评价大豆(Glycine max)植物和杂草组合栽培土壤中微生物活性、无机磷增溶(Pi)和酸性磷酸酶的变化。大豆采用单作栽培,与Bidens pilosa、Brachiaria decumbens (Syn. Urochloa decumbens)和Eleusine indica在两种条件下进行竞争:a)根间无接触竞争b)根间有接触竞争。在花瓶中添加了一个带有50µm网的尼龙筛网,以防止竞争物种的根之间接触,从而使基质可以在花瓶中分离。实验以随机分组进行,重复4次。与单作大豆相比,与杂草竞争的大豆导致单位微生物生物量有机物的氧化降低,导致代谢商降低。大豆根系与毛叶扁豆(B. pilosa)、双曲扁豆(B. decumbens)和籼稻(E. indica)的接触保持了较强的影响,提高了Pi的增溶性,相对于尼龙筛栽培,Pi的增溶性分别为51、39和31%。微生物活性、无机磷增溶和酸性磷酸酶受植物种类、杂草和大豆组合的影响;在某些情况下通过根接触。因此,土壤微生物活性可以影响竞争策略和植物发育。
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来源期刊
Planta Daninha
Planta Daninha Agricultural and Biological Sciences-Plant Science
自引率
0.00%
发文量
0
审稿时长
16 weeks
期刊介绍: Planta Daninha is a scientific journal published by the Brazilian Society of Weed Science (SBCPD - Sociedade Brasileira da Ciência das Plantas Daninhas). Papers submitted for publication must be sent through an electronic system, on http://www.scielo.br/pd. Works may be written in Portuguese, English, or Spanish, and will be accepted after being reviewed and approved by the Editorial Board. Only papers that have not been published or submitted for publication in other media will be accepted. Articles in Portuguese will be translated to English after being properly corrected and authorized by the authors. Planta Daninha has with goal to publish genuine technical-scientific papers and literature reviews from a critical perspective on Biology, weed management, and related topics.
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