The objective of the present study was to evaluate efficiency X-rays in identifying fissures artificially dried rice seeds and relationship between damage seed performance germination test. Irrigated IRGA 417 420 cultivars were harvested with 23.3 24.5% water content respectively submitted stationary drying treatments at 32, 38, 44 50 °C. taken subsamples 100 for each treatment, using an MX-20 X-ray equipment. X-rayed classified from 1 3, where corresponded without fissures, 2 non-severe 3...

Nitrogen has a complex dynamics in the soil-plant-atmosphere system. N fertilizers are subject to chemical and microbial transformations soils that can result significant losses. Considering cost of fertilizers, adoption good management practices like fertigation could improve use efficiency by crops. Water balances (WB) were applied evaluate fertilizer leaching using 15N labeled urea west Bahia, Brazil. Three scenarios (2008/2009) established: i) rainfall + irrigation full year, ii) only;...

Sampling field soils to estimate soil water content and storage (S) is difficult due the spatial variability of these variables, which demands a large number sampling points. Also, methodology employed in most cases invasive destructive, so that same positions at different times impossible. However, neutron moderation, time domain reflectrometry, and, more recently, frequency reflectrometry methodologies allow measurements points over long intervals. This study evaluates set probe data,...

Brazil is a major world coffee producer, using increasing quantities of nitrogen (N) fertilizer as the monoculture expands across savannas. The fate and efficiency this N were evaluated for one complete cropping cycle 15N tracer, permitting an balance at harvest. Annual rates 200, 400, 600, 800 kg ha−1 year−1 15N-labeled urea unfertilized control applied every 14 days via fertigation. concentration, percentage derived from fertilizer, quantity per rate was assessed 8-year-old trees. most...

O elemento fosfato apresenta características específicas no solo, as quais são determinantes em seu movimento solo e suprir às plantas. Fatores como a textura mineralogia do governam diretamente os resultados das reações adicionado pelo fertilizante consequente disponibilidade na solução onde característica molecular dos reagentes implicam diferenciação produtos finais solução. Sendo assim, fertilizantes fosfatados com diferentes moleculares poderiam apresentar eficiência distinta sob...

Long-term no-till with shallow fertilizer input results in a chemical enriched topsoil but has minor effect of subsoil. The sub-optimal use water and mobile nutrients stored the subsoil layers is frequent limiting factor to crop grain yield tropical acid soils. This study aim assesses corn soybean response gypsum combined lime surface as tool for quality improving. A Brazilian distrophic Oxisol located Carazinho (RS State, BR) managed under continuous characteristics good soil poor condition...

Cover crops (CC), particularly legumes, are key to promote soil carbon (C) sequestration in no-tillage. Nevertheless, the mechanisms regulating this process need further elucidation within a broad comprehensive framework. Therefore, we investigated effects of CC quality: black oat (Avena strigosa Schreb) (oat), common vetch (Vicia sativa L.) (vetch), and + on dioxide-C (CO2-C) emission (124 days) under conventional- (CT), minimum- (MT) no-tillage (NT) plots from long-term experiment Southern...

In order to select soil management practices that increase the nitrogen-use efficiency (NUE) in agro-ecosystems, different indices of agronomic fertilizer must be evaluated under varied weather conditions. This study assessed NUE no-till corn southern Paraguay. Nitrogen rates from 0 180 kg ha-1 were applied a single application at sowing and crop response investigated two growing seasons (2010 2011). The experimental design was randomized block with three replications. Based on data grain...

ABSTRACT Despite its relevance, nitrogen is poorly utilized by the plants when improperly applied. Thus, objective of this study was to evaluate yield and use efficiency (NUE) in corn response doses split application fertilization. The experimental design a randomized block design, with three replications. Doses 0, 30, 60 180 kg ha-1 were applied at sowing order create different nutritional status obtain values Normalized Difference Vegetation Index (NDVI) measured “Greenseeker®” optical...

ABSTRACT The efficiency of nitrogen fertilizer in corn is usually low, negatively affecting plant nutrition, the economic return, and environment. In this context, a variable rate nitrogen, prescribed by crop sensors, has been proposed as an alternative to uniform traditionally used farmers. This study tested hypothesis that optical sensor, increases use grain yield compared nitrogen. following treatments were evaluated: 0; 70; 140; 210 kg ha-1 under 140 ha -1 source was urea applied on soil...

O trabalho teve como objetivo avaliar o teor de proteína elemento auxiliar na determinação da qualidade fisiológica sementes arroz, além correlacioná-la com a emergência em campo. Foram utilizados seis lotes sendo três cultivar IRGA 417 e 422 CL, submetidas ao conjunto testes, para caracterizar potencial fisiológico dos lotes: germinação, primeira contagem envelhecimento acelerado, frio sem terra, comprimento plântula massa seca plântula. Após inicial foi aplicado novo composto pelo bruta...

Nitrate losses from soil profiles by leaching should preferentially be monitored during high rainfall events and irrigation when fertilizer nitrogen applications are elevated. Using a climatologic water balance, based on the models of Thornthwaite Penman Monteith for potential evapotranspiration, drainage fluxes below root zone were estimated in fertigated coffee crop. Soil solution extraction at depth 1 m allowed calculation nitrate leaching. The average concentration plots that received...

Rice culture can suffer great damages due to fungal diseases which affect seeds, roots, leaves and panicles, among the blast disease stands out. In this context, chemical control through fungicide use takes a key role, promoting healing, protecting eradicative effects of disease. The majority fungicides recommended include active ingredients systemic action ways, that is, capable penetrating moving inside plants, being able exert its effect in different location from applied. This study...

The objective of this research was to study laboratory tests in order classify rice seed lots as vigor levels and relate them with the hydration behavior seeds seedling emergence field. Five cultivar IRGA 417 were submitted standard germination following : first count germination, cold test (without soil), accelerated aging, aging saline solution, speed strictu sensu evaluated mean time germinate index; primary root protrusion earliness, field curve. These data then related emergence. It...

O trabalho teve como objetivo verificar a relação existente entre o comportamento da curva de hidratação sementes arroz e sua qualidade fisiológica. Foram utilizados seis lotes arroz, sendo três cultivar IRGA 417 422 CL, inicialmente submetidos testes para caracterizar potencial fisiológico dos lotes: germinação, primeira contagem envelhecimento acelerado, frio sem terra, condutividade elétrica, comprimento plântula, massa seca plântula emergência em campo. Posteriormente, foi determinada...

Coffee cultivation via central-pivot fertigation can lead to fertilizer losses by soil profile internal drainage when water application is excessive and soils have low retention cation adsorption capacities. This study analyses the deep from top 1 m sandy layer of east Bahia, Brazil, cultivated with coffee at a high technology level (central-pivot fertigation), using above normal N rates. The (Q) estimation made through climatologic balance (CWB) program having as input direct measures...

Physalis angulata L. é uma planta anual com propriedades alimentícias e medicinais. Em métodos de propagação vegetativa, como a estaquia, importante o uso promotores enraizamento. O objetivo foi avaliar influência concentrações tempos imersão em extrato vegetal tiririca sobre estaquia fisalis. Foi utilizado delineamento inteiramente casualizado fatorial (5x2), 5 repetições. Os tratamentos foram compostos pela combinação das (0, 25, 50, 75 100%) (5 10 minutos). experimento conduzido casa...

The management of fertilization interferes with the efficiency fertilizers and adoption different methods application must include operational aspect, agronomical economical. study aims to evaluate sources in soybean. was conducted 2012/2013 2013/2014 agricultural years a Oxisol, Cruz Alta, RS, Brazil. treatments consisted four fertilizer two experimental design randomized blocks repetitions. are: MicroEssentials® S9 pure (09.46.00); mixed other raw materials (07.34.12); Monoammonium...

The aim of this work was to evaluate the development Chia at different sowing times and plant spacings. experiment conducted in a commercial area located Northwest Region RS municipality Novo Machado. bifactorial arrangement with 2 spacings 3 times, four replications. factors analyzed were three (January 15 30, February 15) combined two (17 45 cm). following parameters evaluated: mean height, ear length, yield, weight one thousand seeds, germination first test count. variable percentage its...

A preocupação em aliar desenvolvimento econômico e social com a preservação dos recursos naturais é objeto de pesquisas nas mais diversas áreas do conhecimento, dentro que rege o tema sustentabilidade. Torna-se imperativo as instituições insiram estes temas seus currículos. Sobre esta perspectiva, objetivo nosso trabalho foi verificar qual importância dada se está presente temática da sustentabilidade no currículo curso Técnico Administração. Para pesquisa, foram entrevistados coordenador os...

Tibraca limbativentris is considered one of the main species insect pests in irrigated rice. This can be found plants vegetative and reproductive stages. study aimed to select semivariogram models estimate rice stem bug population densities by ordinary kriging. Two fields were used survey T. Oryza sativa. A grid 30 x m was drawn, which generated 143 385 sample units for first second fields, respectively. Seven evaluations two hundred per sampling unit performed during cultivation. From...