The utilization of Normalized Difference Vegetation Index (NDVI) data obtained through satellite images can technically improve the process delimiting management zones (MZ) for annual crops, resulting in socio-economic and environmental benefits. aim this study was to compare delimited MZ, using crop productivity data, with MZ NDVI from areas under a no-tillage system. carried out three located state Rio Grande do Sul, Brazil. Three maps, 2009 2015, were used each area, whereby calculated...

Abstract Improving the chemical conditions for plant growth in subsoil is especially difficult no‐till (NT) soil because of low solubility limestone. In this situation, gypsum may be recommended due to its ability mobilize exchangeable Ca 2+ and other basic cations associated with SO 4 2− anions mainly profile, thereby alleviating Al toxicity. However, response crops contradictory ranges from a substantial increase slight decrease grain yield. work, meta‐analysis comprising 129 harvests six...

Precision agriculture (PA) stands out as an innovative way to manage production resources, increasing the efficiency and socioeconomic environmental sustainability of agricultural systems. In Brazil, principles tools PA started be adopted in late 1990s. To reveal scientific trajectory advances taken over past 25 years we conducted a comprehensive systematic literature review. After searching for available peer-reviewed literature, 442 publications were selected compose database. Our...

A good soil fertility management for soybean production must consider the amount of nutrients that are exported by seeds. In recent decades, yield has increased due to better crop and genetic improvements, which may affect removed. Therefore, this study aimed (i) analyze relationship between concentration macronutrients in seeds Brazil with genotypes, (ii) update nutrient values fertilizer recommendation [...]

O objetivo do trabalho foi estudar a eficiência das malhas amostrais, utilizadas nas áreas manejadas com agricultura de precisão, para caracterização da variabilidade espacial dos teores fósforo (P) e potássio (K). estudo conduzido em 30 agrícolas, localizadas no Rio Grande Sul, cujos solos foram classificados como Latossolos Vermelhos. As dimensões amostrais estudadas foram: 100x100m (10 áreas), 142x142m áreas) 173x173m áreas). Foram analisados os P K na profundidade 0,00-0,10m. Os dados...

Resumo: O objetivo deste trabalho foi avaliar o desempenho de inseticidas autorizados emergencialmente para controle Helicoverpa armigera (Lepidoptera: Noctuidae) em soja. Sete foram pulverizados campo e, após 24 horas, folhas do ponteiro coletadas e oferecidas lagartas 2o instar laboratório. Lagartas 4o receberam a última folha trifoliolada que se encontrava completamente expandida no momento da pulverização. Outro grupo exposto partir 72 horas Em campo, seis seguida, as plantas infestadas...

Although numerous studies have been conducted with common bean regarding nitrogen (N) dose, time of application, and source in no-till (NT) soils Brazil, the heterogeneity results makes it difficult to establish technical recommendations based on individualized studies. This meta-analysis aimed rank main factors influencing response N management NT areas. The database consisted 99 scientific papers that encompassed 160 trials 2394 observations. In general, probability obtaining a [...]

Resumo -O objetivo do presente trabalho foi definir a melhor dose de Osmocote® para produção mudas Apuleia leiocarpa 60 e 90 dias permanência no viveiro após o transplantio acompanhar resposta índice clorofila das durante período em estudo.O delineamento experimental utilizado inteiramente casualizado, sendo constituído cinco tratamentos, dez repetições.Os tratamentos consistiram doses crescentes ( 0, 3, 6, 9 12 kg m -3 substrato).Avaliou-se clorofila, diâmetro colo altura aos transplante...

The objective of this study was to evaluate the short-term dynamics chemical species sulfate and main basic cations in soil solution affected by application different sulfur (S) rates using agricultural gypsum. experiment carried out an Ultisol with 14% clay, managed under no-tillage for 14 yrs Southern Brazil. Four S (0, 5, 10 20 kg ha−1) were evaluated gypsum (CaSO4) as S-source. collected porous capsule lysimeters before at 9, 17, 37, 60, 76 109 d after application, depths 60 cm. Surface...

In sub-tropical Brazil, the wheat (Triticum aestivum L.) crop requires identification of pending constraints as premise for grain yield (GY) increases. this light, spatial variation soil properties and their relationship with GY were investigated in a case study, where delineation homogeneous zones could lead to site-specific management view improvement. 2012, twelve chemical physical attributes, three components (spikes per square meters, grains spike, weight) geo-referentially assessed...

A fonte de fertilizante e o tipo recipiente utilizado na produção mudas em um viveiro estão diretamente relacionados com custo a qualidade das mudas. Neste sentido, objetivo deste estudo foi avaliar cedro função do tamanho recipientes fontes adubação. O delineamento experimental blocos inteiramente casualizados, esquema fatorial 3 x 7, repetições. Os tratamentos consistiram três tipos (Tubete, saco plástico bombona), adubação (Convencional, Kimcoat<sup>®</sup>...

A produção de mudas qualidade, aliada a um baixo custo, é fundamental para o sucesso dos projetos florestais. Neste sentido, escolha correta da fonte fertilizante e do tipo recipiente essencial. Diante disso, objetivou-se com esse estudo avaliar qualidade Cedro-rosa em função uso fertilizantes recipientes diferentes tamanhos. O delineamento experimental utilizado foi blocos casualizados esquema fatorial 3 x (recipientes tamanhos fontes fertilizante), três repetições. Os testados foram: vasos...

ABSTRACT During the application of pesticides on soybean fields, a vertical deposition gradient product can occur throughout canopy, resulting in difficulties for controlling stink bugs that are middle and lower thirds plants. This study aimed at evaluating systemicity thiamethoxam insecticide different phenological stages, using brown as bioindicators pesticide efficacy. The combined sites (lower, upper third) infestation areas five stages (R2, R3, R4, R5.2 R6). For R2 plants presented...

Euschistus heros is one the most important pest insect in soybean fields Brazil. Therefore, site-specific management applied for controlling E. can result economic and environmental benefits. However, sampling protocols assessing spatialtemporal variability of this and, then, guiding a more sustainable management, were still unknown. Thus, objective study was to compare efficiency grid sizes monitoring spatial infestation along reproductive stages. Nine campaigns carried out using beating...

ABSTRACT An uneven seed spacing in the sowing row increases plants intraspecific competition for environmental resources, potentially lowering grain yields. This study aimed to assess yield and components of common bean plants, as a function coefficients variation (0 %, 20 40 % 60 %) seeds row. The main components, plant traits were evaluated. component that best explains variability on is number grains per (r = 0.94). Grain declines linearly increases: 81.5 kg ha-1 (4.4 every 10 increase...

There is no consensus in the literature regarding how many subsamples are needed to perform accurate on-farm soil penetration resistance (SPR) mapping. Therefore, objective of this study was define number per sampling point quantify SPR. The experiment performed a 4.7 ha area and employed 50 × m grid system (18 points). SPR evaluated using digital penetrometer two different years with 1, 2, 3, 4, 5, 6, 9, 12, 15 point. maps produced increasing numbers were compared reference (15 subsamples)...

Water stress and nutritional deficiency are the main factors that affecting grain yield of maize crops. In this sense, aim study was to evaluate components productivity hybrids through use fertilizer levels drought at different periods reproductive stage. The carried out in a greenhouse using plastic vases with 15 liter capacity. A randomized block design factorial scheme (3 x 4 3) three repetitions used. were constituted by (P30F53, AS1551 AG5011), fertilization (0, 0.5, 1 1.5 times...

A adubação nitrogenada na cultura do feijoeiro é essencial para a obtenção de elevada produtividade, sendo que utilização sensores clorofila pode auxiliar nas tomadas decisões, com relação ao manejo nitrogênio (N). Nesse sentido, objetivou-se este estudo avaliar produtividade grãos e componentes rendimento comum em função da índice clorofila, calcular o suficiência (ISC) estimar dose N ser aplicada cobertura. O delineamento experimental utilizado foi blocos acaso, arranjo fatorial 8 x 5,...

A aplicação localizada de nitrogênio, baseada no índice relativo clorofila das folhas, pode proporcionar inúmeros benefícios econômicos e ambientais, entanto, o conhecimento sobre a metodologia amostragem ainda é incipiente. Nesse sentido, este estudo objetivou avaliar uso diferentes malhas amostrais na caracterização da variabilidade espacial do folhas cultura trigo confecção mapas temáticos para nitrogênio. Para determinação clorofila, utilizou-se clorofilômetro CFL 1030, em uma malha...