Agronomic characteristics and management of diseases in maize with chelate-based products containing calcium, copper, manganese, and zinc

Lorenzetti, Eloísa; Tartaro, Juliano; Stangarlin, José Renato; Kuhn, Odair José; Portz, Roberto Luis; Neto, Alfredo José Alves

doi:10.4025/actasciagron.v43i1.48432

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…Number of grain rows per ear: 20 ears were selected per experimental unit and the number of grain rows of each of the ears was counted and averaged. Te number of grains per grain row was counted in 20 ears gathered from plants selected randomly; an average was obtained for each treatment [32]. Grain yield (Mg•ha −1 ): ears were harvested on the center rows at the end of the crop cycle, and the weight of grain production was determined using precision scales when the grains reached 13% humidity [33,34].…”

Section: Installation Processmentioning

confidence: 99%

Implementation and Use of Green Manures for Weed Suppression in Sequential Maize Cropping

Servín Niz,

Da Silva Oviedo,

Morel López

et al. 2023

International Journal of Agronomy

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The ground cover produced by green manures has a direct influence on weed suppression and, in addition, the biomass produced by these same plants influences crop growth. This study was carried out to compare the effect of green manure species on the incidence of weeds, in sequence, in order to evaluate the effects of the use of green manure cover on the productive characteristics of maize plants. A completely randomised experimental design was used, with 11 treatments and 4 replications. The treatments were cover crops Canavalia ensiformis (T1), Cajanus cajan (T2), Stizolobium pruriens (T3), Crotalaria juncea (T4), Phaseolus vulgaris (T5), Stizolobium trigre (T6), Stizolobium aterrimum (T7), Crotalaria retusa (T8), Crotalaria breviflora (T9), Dolichos lablab (T10), and conventional system (T11). Ninety days after sowing, the green manures were cut, and 30 days after the green manures were cut, the hybrid maize Crop Top 520 was sown. The variables evaluated in relation to the planting of green manures were the green and dry biomass of green manures, alongside the green biomass of weeds and suppression of weeds. Concerning maize plants, the variables evaluated were plant height at 60 DAS, stalk diameter at 60 DAS, number of grain rows per ear, number of grains per grain row, and yield. The averages were subsequently analyzed using Tukey’s test at 95% significance level. The use of green manure significantly reduces the green mass of weeds up to 90 days due to lack of access to light of the weeds, which reduces their appearance and growth. Stizolobium aterrimum showed the best results both as a dry mass producer and weed suppressor and also as a yield enhancer in maize crops.

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Section: Installation Processmentioning

confidence: 99%

Implementation and Use of Green Manures for Weed Suppression in Sequential Maize Cropping

Servín Niz,

Da Silva Oviedo,

Morel López

et al. 2023

International Journal of Agronomy

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Toxicity and Availability of Manganese in the Growth of Tropical Grasses in Contaminated Soil

Silva,

Souza,

Nardis

et al. 2024

Applied and Environmental Soil Science

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Phytoremediation is a technique with high viability due to its low cost and minimal environmental impact. However, there are a few results regarding the use of tropical grasses in the phytoremediation of manganese (Mn), and there is no clear definition of which extractor is more suitable for assessing Mn availability in soils. The objective of this study was to evaluate the growth potential and phytoremediation of five tropical grasses in Mn‐contaminated soil, as well as to assess the efficiency of four extractors in Mn extraction. The grass cultivars evaluated included Aruana and Tanzânia of Megathyrsus maximus, Xaraés and Marandu of Urochloa brizantha, and Basilisk of Urochloa decumbens grown in Typic Hapludox (Oxisol) amended with 0, 50, 150, and 450 mg of Mn per kg−1 of soil. The experiment was conducted in a greenhouse, using a completely randomized experimental design in a 5 × 4 factorial scheme, with five replications. The experimental period lasted for 90 days. The dry matter of the shoot and root of the grasses was evaluated. Mn concentration in dry matter and its availability in soil were extracted by Mehlich‐1 and DTPA pH 7.3, while the semitotal concentration was determined by USEPA 3051 and total Mn by USEPA 3052 method. Tropical grasses showed reduced growth with increasing Mn rates in the soil, with the following sequence in the reduction in growth: Aruana > Basilisk > Marandu > Xaraés and lastly the Tanzânia. The Aruana cultivar showed greater potential for phytoextraction due to its higher ability to accumulate Mn in its biomass, followed by the Basilisk cultivar. The four different evaluated extractors were efficient in measuring Mn concentrations in the soil, with higher toxicity critical levels for the USEPA 3051 method due to the semitotal extraction nature and USEPA 3052 due to total Mn extraction. The growth of tropical grasses is reduced with increasing Mn rates applied to the soil. The Aruana of M. maximus grass has greater potential for phytoextraction of Mn‐contaminated soils, followed by Basilisk of Urochloa decumbens, Xaraés and Marandu of U. brizantha, and Tanzânia of M. maximus. The Mehlich‐1, DTPA pH 7.3, USEPA 3051, and 3052 extractors were efficient in extracting and evaluating Mn availability in soil for tropical grasses. The USEPA 3051 and 3052 methods presented higher toxicity critical levels.

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Arreglos espaciales y fertilizante nitrogenado en maíz en siembra directa

Morel López,

Caballero Casuriaga,

Osmar Da silva Oviedo

et al. 2024

Acta Agron.

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El objetivo del estudio fue evaluar el efecto de dos arreglos espaciales y cinco dosis de fertilizante nitrogenado en maíz cultivado en siembra directa. El experimento fue realizado en el distrito de Belén, Concepción, Paraguay, en el ciclo productivo 2017/2018. Se utilizó un diseño en bloques completos al azar (DBCA), con arreglo en parcelas subdivididas (2x5), correspondiendo la parcela principal al arreglo espacial (0.2 m entre plantas con 1 planta por punto de siembra y 0.4 m entre plantas con 2 plantas por punto de siembra); y la parcela secundaria, a dosis de N (0, 50, 100, 150 y 200 kg ha-1) con cuatro repeticiones. Las variables estudiadas fueron: altura de la planta (AP), altura de inserción de mazorca (AIM), diámetro de mazorca (DM), longitud de mazorca (LM), número de hileras de grano por mazorca (NHM), número de granos por hilera (NGH) y rendimiento de grano. Los datos fueron sometidos al análisis de varianza (Anova) y las medias de las variables fueron comparadas por el test de Tukey al 5 % de probabilidad de error y análisis de regresión para dosis de nitrógeno. Los resultados arrojados por el experimento indican que el arreglo espacial del distanciamiento de 0.20 m y 1 planta por punto de siembra de maíz en siembra directa favoreció significativamente en la mayoría de las variables. La aplicación de fertilizante nitrogenado mostró efectos significativos sobre las variables estudiadas, ajustándose a una ecuación cuadrática, excepto NGH, que se ajusta en forma lineal. La aplicación de 119.89 kg ha-1 N a las plantas de maíz cultivadas con un distanciamiento de 0.2 m y 1 planta por punto de siembra registró los mayores rendimientos.

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Agronomic characteristics and management of diseases in maize with chelate-based products containing calcium, copper, manganese, and zinc

Cited by 3 publications

References 15 publications

Implementation and Use of Green Manures for Weed Suppression in Sequential Maize Cropping

Implementation and Use of Green Manures for Weed Suppression in Sequential Maize Cropping

Toxicity and Availability of Manganese in the Growth of Tropical Grasses in Contaminated Soil

Arreglos espaciales y fertilizante nitrogenado en maíz en siembra directa

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