New strains of Bradyrhizobium enrich plant biomass nitrogen content in Crotalaria for use as a green manure

IF 1.2 4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY
J. S. Silva, Dâmiany Pádua Oliveira, M. Rufini, Celso Leandro da Silva Junior, Márcia Baptista, Osnar Obede da Silva Aragão, Thiago de Assis Pereira, F. M. Moreira
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Abstract

ABSTRACT In spite of the chemical, physical, and biological benefits that Crotalaria spectabilis can provide to the soil, it is little used as a green manure crop by farmers. Inoculation with strains of legume-nodulating nitrogen-fixing bacteria that are efficient and competitive may be a strategy to enhance accumulation of N in C. spectabilis and stimulate adoption of this green manure crop. The aims of this study were i) to evaluate the symbiotic and agronomic efficiency of new strains of Bradyrhizobium on C. spectabilis in an oxisol (red latosol) compared to that of noninoculated controls (without and with mineral N) and with the approved strain BR2811, seeking to corroborate possible recommendation as inoculants for this species; and ii) to determine, the contribution of these treatments to N accumulation in the plant of C. spectabilis in four periods of cutting for determining possible and ideal periods for its incorporation in the soil. Experiments were carried out in pots and field. Inoculation with the new strains UFLA05-03, UFLA05-09, and UFLA05-14 and with BR2811 on C. spectabilis is effective since it increases the production of N-enriched plant biomass when compared to the control without N mineral. However, UFLA05-03 stands out among these strains because it behaves similarly to the control with mineral N both in relation to shoot N accumulation and dry matter just after 150 days in the field.
利用慢生根瘤菌新菌株提高禾本科植物生物量氮含量用作绿肥
摘要:尽管赤豆能为土壤提供化学、物理和生物效益,但它很少被农民用作绿肥作物。接种高效且具有竞争力的豆类结瘤固氮菌菌株,可能是提高赤杨体内氮积累和促进绿肥作物采用的一种策略。本研究的目的是:i)与未接种对照(不含和含矿物质N)和已批准菌株BR2811相比,评估在oxisol(红赤霉菌)中的慢生根瘤菌新菌株对壮观梭菌的共生和农艺效率,试图证实作为该物种接种剂的可能推荐;和ii)确定这些处理在四个切割期内对壮观紫丁香植株中氮积累的贡献,以确定其融入土壤的可能和理想时期。实验在盆栽和田间进行。用新菌株UFLA05-03、UFLA05-09和UFLA05-14以及用BR2811在壮观芽孢杆菌上接种是有效的,因为与不含氮矿物的对照相比,它增加了富氮植物生物量的产量。然而,UFLA05-03在这些菌株中脱颖而出,因为它在田间150天后的芽氮积累和干物质方面的表现与矿物氮对照相似。
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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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