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77 results

Reference Values of Grain Nutrient Content and Removal for Corn

Aildson Pereira Duarte ORCID logo , Mônica Ferreira de Abreu, Eros Artur Bohac Francisco, Douglas de Castilho Gitti, Gabriel Barth, Claudinei Kappes

13/May/2019

ABSTRACT: Unchanged reference values of grain nutrient contents for corn have been used for over 20 years, despite yield increases, the development of new hybrids, and modifications to cropping systems, especially the establishment of in-season second crops and the wide adoption of no-tillage. This study measured macro- and micronutrient contents in corn grains from different regions, in the first (summer) and second (fall) crop, to update the reference values of estimated nutrient removal. A secondary objective was to determine whether […]

Nitrate Reductase Activity and Nitrogen and Biomass Accumulation in Sugarcane under Molybdenum and Nitrogen Fertilization

Renato Lemos dos Santos, Fernando José Freire, Emídio Cantídio Almeida de Oliveira, Maria Betânia Galvão dos Santos Freire ORCID logo , Jason Brossard West, José de Arruda Barbosa, [...]

13/May/2019

ABSTRACT Prior research on sugarcane showed increment of productivity following molybdenum (Mo) fertilization and some indication of the potential role either on nitrate reductase activity (NRA). However, this increment can depend on sugarcane variety and nitrogen (N) fertilization. This study aimed to evaluate the effect of Mo fertilization on Mo uptake, on NRA, nitrate (NO3–-N), and ammonium (NH4+-N) contents in leaves and roots of sugarcane, and the accumulation of N and biomass across two sugarcane varieties (RB 867515 and RB […]

Does Ferralsol Clay Mineralogy Maintain Potassium Long-Term Supply to Plants?

Diovane Freire Moterle ORCID logo , Edson Campanhola Bortoluzzi, João Kaminski, Danilo dos Santos Rheinheimer, Laurent Caner

10/Apr/2019

ABSTRACT Ferralsols ( Latossolos ) should contain few or no 2:1 clay minerals and have low potassium (K) contents, and consequently low levels of non-exchangeable K forms are expected. The aim of this study was to evaluate how the clay mineralogy of a Ferralsol affects the soil K dynamics in response to K fertilization during cropping and whether the clay mineralogy was altered due to successive crops and K fertilization. A tropical Brazilian Ferralsol under field conditions was sampled (0.00-0.20 […]

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Timing and Splitting of Nitrogen Side-Dress Fertilization of Early Corn Hybrids for High Grain Yield

Fernando Panison ORCID logo , Luís Sangoi, Murilo Miguel Durli, Lucieli Santini Leolato, Antonio Eduardo Coelho, Hugo Francois Kuneski, [...]

08/Mar/2019

ABSTRACT Currently, most nitrogen fertilizer is side-dressed when corn is in the four (V4) to eight (V8) expanded leaf stage. However, recent studies have shown that modern hybrids take up high amounts of nitrogen during grain filling. This indicates that a late nitrogen fertilization, at the time of crop flowering, may be important to optimize corn agronomic performance. This study aimed to evaluate the effect of the timing and splitting of nitrogen side-dress application on the agronomic performance of early […]

Crop Yield Responses to Sulfur Fertilization in Brazilian No-Till Soils: a Systematic Review

Osmar Henrique de Castro Pias ORCID logo , Tales Tiecher, Maurício Roberto Cherubin, Michael Mazurana, Cimélio Bayer

06/Feb/2019

ABSTRACT Sulfur (S) fertilization recommendations for grain crops in Brazil were formerly established from studies on crops with a low yield potential grown on soils under conventional tillage (CT). However, the subsequent adoption of no-tillage (NT) altered S dynamics in the soil, making it necessary to carefully evaluate the applicability of these S fertilizer recommendations. In addition, the emergence of modern high-yield-potential genotypes, the successive application of concentrated low-sulfur fertilizers, and reduction in S atmospheric deposition have raised the likelihood […]

Potassium Fertilization of Eucalyptus in an Entisol in Low-Elevation Cerrado

Rodolfo de Niro Gazola, Salatiér Buzetti, Marcelo Carvalho Minhoto Teixeira Filho ORCID logo , Raíssa Pereira Dinalli Gazola, Thiago de Souza Celestrino, Alexandre Costa da Silva, [...]

06/Feb/2019

ABSTRACT Potassium (K) is one of the most highly accumulating nutrients in Eucalyptus and, consequently, is heavily exported by the harvesting of wood. Moreover, its availability in the soil in most Brazilian plantation areas is very low, especially in the regions of the Cerrado biome, which has soils with low natural fertility and marked water deficits, implying a lack of nutrient supply and, consequently, a less efficient water use. Our objective was to evaluate the effects of K fertilization on […]

Phosphorus Fractions in Soil with Organic and Mineral Fertilization in Integrated Crop-Livestock System

Amanda Zolet Rigo, Juliano Corulli Corrêa ORCID logo , Álvaro Luiz Mafra, Paulo Hentz, Marco André Grohskopf, Luciano Colpo Gatiboni, [...]

06/Feb/2019

ABSTRACT Use of organic fertilizers in integrated crop-livestock (iCL) systems may affect soil phosphorus fractions. This study aimed to determine phosphorus fractions in the soil under the iCL system after six years of application of organic or mineral fertilizers. The experiment was conducted on a Rhodic Kandiudox (Nitossolo Vermelho Distroférrico) in a randomized block design, using a 5 × 3 + 1 factorial scheme, with four replicates. The treatments consisted of three organic fertilizers (poultry litter, pig slurry, and compost) […]

Rhizobial Inoculation and Molybdenum Fertilization in Peanut Crops Grown in a No Tillage System After 20 Years of Pasture

Carlos Alexandre Costa Crusciol, Jayme Ferrari Neto, Tsai Siu Mui, Alan Joseph Franzluebbers, Cláudio Hideo Martins da Costa, Gustavo Spadotti Amaral Castro, [...]

07/Jan/2019

ABSTRACT: Peanut (Arachis hypogea) is an important legume grain consumed by humans and utilized for effective nutrient cycling in a diverse cropping system. Areas that have been cultivated with perennial pasture for decades may have nutritional deficiencies and lack a sufficient population of atmospheric nitrogen-fixing bacteria. Molybdenum is an essential micronutrient that is part of the enzyme nitrogenase contained within symbiotic Bradyrhizobium bacteria, which are responsible for fixing nitrogen in legumes. Our objective was to evaluate the effects of application […]

Modeling in the Adjustment of Fertilization Recommendation through Leaf Analysis in Fertigated ‘Prata’ Banana

José Aridiano Lima de Deus, Júlio César Lima Neves, Ismail Soares, Víctor Hugo Alvarez V., Fabricio Martinazzo Regis de Albuquerque, Lauana Lopes dos Santos, [...]

26/Nov/2018

ABSTRACT: In banana cultivation, fertilization recommendations are almost exclusively based on soil chemical analysis, without considering leaf analysis and expected yield, which can help in the adjustment of fertilization programs. The aim of this study was to develop a method to recommend macronutrient fertilization rates which integrates data on leaf analysis, soil chemical analysis, and yield. Yield, soil chemical analysis, and leaf analysis data of fertigated plantations of ‘Prata’ banana were obtained for the first and second halves of the […]

Potassium Dynamics in Ruzigrass Rhizosphere

Marcelo Raphael Volf, Tiara Moraes Guimarães, Daniele Scudeletti, Igor Vilela Cruz, Ciro Antonio Rosolem

02/Nov/2018

ABSTRACT: Ruzigrass (Urochola ruziziensis) has a large capacity to take up K from the soil, including non-exchangeable forms, and can play an important role in nutrient cycling in integrated production systems. However, K transport to roots of brachiarias is not well known, nor the nutrient dynamics in the rhizosphere, where a concentration gradient may be established towards the non-rhizospheric soil, creating a favorable environment for the release of non-exchangeable K. This study aimed to evaluate the effect of ruzigrass on […]

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