Inoculant of Arbuscular Mycorrhizal Fungi (Rhizophagus clarus) Increase Yield of Soybean and Cotton under Field Conditions.
Nutrient availability is an important factor in crop production, and regular addition of chemical fertilizers is the most common practice to improve yield in agrosystems for intensive crop production. The use of some groups of microorganisms that have specific activity providing nutrients to plants is a good alternative, and arbuscular mycorrhizal fungi (AMF) enhance plant nutrition by providing especially phosphorus, improving plant growth and increasing crop production. Unfortunately, the use of AMF as an inoculant on a large scale is not yet widely used, because of several limitations in obtaining a large amount of inoculum due to several factors, such as low growth, the few species of AMF domesticated under in vitro conditions, and high competition with native AMF. The objective of this work was to test the infectivity of a Rhizophagus clarus inoculum and its effectiveness as an alternative for nutrient supply in soybean (Glycine max L.) and cotton (Gossypium hirsutum L.) when compared with conventional chemical fertilization under field conditions. The experiments were carried out in a completely randomized block design with five treatments: Fertilizer, AMF, AMF with Fertilizer, AMF with 1/2 Fertilizer, and the Control with non-inoculated and non-fertilized plants. The parameters evaluated were AMF root colonization and effect of inoculation on plant growth, nutrient absorption and yield. The results showed that AMF inoculation increased around 20 % of root colonization in both soybean and cotton; nutrients analyses in vegetal tissues showed increase of P and nitrogen content in inoculated plants, these results reflect in a higher yield. Our results showed that, AMF inoculation increase the effectiveness of fertilizer application in soybean and reduce the fertilizer dosage in cotton.
Laboratório de Microbiologia, Instituto de Ciências Agrarias e Ambientais, Universidade Federal de Mato Grosso Sinop, Brazil.
Martha V T
MV
Cely
Laboratório de Ecologia Microbiana, Departamento de Microbiologia, Universidade Estadual de Londrina Londrina, Brazil.
Admilton G
AG
de Oliveira
Laboratório de Ecologia Microbiana, Departamento de Microbiologia, Universidade Estadual de Londrina Londrina, Brazil.
Vanessa F
VF
de Freitas
Laboratório de Ecologia Microbiana, Departamento de Microbiologia, Universidade Estadual de Londrina Londrina, Brazil.
Marcelo B
MB
de Luca
Laboratório de Ecologia Microbiana, Departamento de Microbiologia, Universidade Estadual de Londrina Londrina, Brazil.
André R
AR
Barazetti
Laboratório de Ecologia Microbiana, Departamento de Microbiologia, Universidade Estadual de Londrina Londrina, Brazil.
Igor M O
IM
Dos Santos
Laboratório de Ecologia Microbiana, Departamento de Microbiologia, Universidade Estadual de Londrina Londrina, Brazil.
Barbara
B
Gionco
United Phosphorus Limited do Brazil São Paulo, Brazil.
Guilherme V
GV
Garcia
Fazenda Escola, Departamento de Agronomia, Universidade Estadual de Londrina Londrina, Brazil.
Cássio E C
CE
Prete
Laboratório de Ecologia Microbiana, Departamento de Microbiologia, Universidade Estadual de Londrina Londrina, Brazil.
Galdino
G
Andrade
Glycine max L.; Gossypium hirsutum L.; nutrient uptake; rhizosphere; seed inoculation