Cover crops, nitrogen doses, and inoculation with <i>Azospirillum brasilense</i>, in maize in the Cerrado

Portugal, José Roberto; Arf, Orivaldo; Peres, Amanda Ribeiro; Gitti, Douglas de Castilho; Garcia, Nayara Fernanda Siviero

doi:10.5935/1806-6690.20170074

Cited by 16 publications

(18 citation statements)

References 2 publications

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“…These authors, however, have argued that the adequate N availability in the period between flowering and the beginning of the grain filling is fundamental so that its translocation to the grains is effective, without losses in the specific mass. Portugal et al (2017) obtained a lower mass of 1,000 grains when the seeds were inoculated with A. brasilense, similar to the result obtained for the majority of treatments inoculated in the present study. The authors' explanation for this negative effect is that the bacterium, being heterotrophic, requires N for its survival, being able to compete with the plant in case of low nutrient availability in the soil.…”

Section: Resultssupporting

confidence: 90%

Application methods of Azospirillum brasilense in first- and second-crop corn

Alvarez

Benetão

Barzotto

et al. 2019

Rev. bras. eng. agríc. ambient.

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This study investigated whether inoculation of Azospirillum brasilense in the seeds or sowing furrow could reduce the need for nitrogen fertilizer application in the corn grown in the first and second crop harvest. The experiments were conducted, in the municipality of Chapadão do Sul, MS, Brazil, in the first crop harvest (2014/2015) and in the second crop harvest (2016). The early maturity hybrids CD 384 HX and P3132H were used in the first and in the second harvest corn, respectively. In both experiments, the experimental design was the randomized blocks with eight treatments and three repetitions. At the silking (R1 stage), the leaf N concentration, relative chlorophyll index and nitrate reductase activity were measured, at the physiological maturity (R6 stage), the plant height, first ear insertion height, one hundred grain mass, grain yield and grain N concentration were measured. In the first crop harvest, the application of Azospirillum brasilense at the sowing furrow resulted in higher N concentration and relative chlorophyll index in corn leaves, while the inoculation of A. brasilense in the seeds provided higher N concentration in the grains. The nitrate reductase activity in corn leaves was lower when inoculation was performed. In the second crop harvest, the inoculation did not affected the N concentration in the leaves and in the grains, the relative chlorophyll index and the growth of corn plants. Inoculation in the sowing furrow associated with the application of 20 kg N ha-1 at sowing and 120 kg N ha-1 at topdressing resulted in lower nitrate reductase activity.

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Section: Resultssupporting

confidence: 90%

Application methods of Azospirillum brasilense in first- and second-crop corn

Alvarez

Benetão

Barzotto

et al. 2019

Rev. bras. eng. agríc. ambient.

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“…To maintain soil cover and supply nutrients to the next crop, the C/N ratio of the plant material should be known (Table 4). The higher the C/N ratio, the slower the decomposition of plant residues and the slower the nutrient release (Portugal, Arf, Peres, Gitti, & Garcia, 2017). Therefore, choosing cover crops with intermediate C/N ratios would help maintain the balance between soil cover and nutrient supply.…”

Section: Accumulation Of Dry Mass and Nutrients In Cover Cropsmentioning

confidence: 99%

Do cover crops improve the productivity and industrial quality of upland rice?

et al. 2020

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Global rice (Oryza sativa L.) cultivation is expected to increase, especially in upland no‐tillage systems (NTS). The difficulty in producing and maintaining straw in NTS in the Brazilian Cerrado and comparative regions worldwide can be overcome by using cover crops in irrigated areas. The potential of straw accumulation, soil cover maintenance, and nutrient cycling is considered while choosing cover crop species, because these characteristics may interfere with subsequent crop cultivation. This study was conducted to determine whether cover crops could benefit the development, productivity, and industrial quality of upland rice grains irrigated by sprinklers and cultivated in succession. The experiment was conducted in the Cerrado, with a summer rainy season and a dry winter. The treatments consisted of six cover crops (millet [Pennisetum glaucum], sunn hemp [Crotalaria juncea], pigeonpea [Cajanus cajan], millet + sunn hemp, millet + pigeonpea, and fallow) sowed in winter or spring. Compared to fallow, the cover crops cultivated in winter or spring led to increased straw production, accumulation of approximately 150% more nitrogen in straw, and possibly improved rice nutritional value because of the higher N content. Rice plants cultivated after sunn hemp developed a greater dry mass than rice cultivated after the fallow treatment. Grain yield was not influenced by the cover crops. However, sunn hemp cultivation increased the milling yield, head rice yield, and the milled rice productivity (MRP), compared to cultivation following the fallow treatment. Cultivation of sunn hemp before the upland rice crop improved MRP compared to that following the fallow treatment.

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“…2) use of plant growth-promoting bacteria (Spolaor et al, 2016). 3) use of grain legumes and green manure in rotation or in combination (thus supplying N derived from biological nitrogen fixation -BNF) (Portugal, Arf, Peres, Gitti, & Garcia, 2017). 4) the application of organic waste from the farm itself.…”

Section: Resultsmentioning

confidence: 99%

Energy efficiency in maize crops in different regions of Brazil

Guareschi

Silva

Caballero

et al. 2021

Semina: Ciênc. Agrár.

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Assessment of energy efficiency (EE) enables the evaluation of the sustainability of agrosystems, as well as decision-making regarding reduction in production costs and environmental pollution and even to increase production in a sustainable way. In this context, the objective of this study was to assess energy efficiency in maize in different regions of Brazil. For this purpose, 32 areas of maize crop distributed across the major producing states and regions were assessed. Energy inputs and outputs of agricultural operations and/or agricultural inputs were calculated by multiplying the amount used by their calorific value or energy coefficient at each stage of production. Energy efficiency was calculated as the ratio between the total output energy and the total input energy during the production process. For every megajoule (MJ) of energy consumed in the production of second-crop maize and first-crop maize seasons, 9.9 and 8.7 MJ respectively of renewable energy were produced in the form of grain. In both maize cropping seasons, most of the energy use was attributed to fertilizers, herbicides and fuel. To be representative the evaluation of energy efficiency of the maize crop should be performed in different Brazilian cultivation regions, as it will represent different edaphoclimatic and management conditions spread over the national territory within an agricultural year.

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Cover crops, nitrogen doses, and inoculation with Azospirillum brasilense, in maize in the Cerrado

Cited by 16 publications

References 2 publications

Application methods of Azospirillum brasilense in first- and second-crop corn

Application methods of Azospirillum brasilense in first- and second-crop corn

Do cover crops improve the productivity and industrial quality of upland rice?

Energy efficiency in maize crops in different regions of Brazil

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