The development of smartphones, specifically their cameras, and imaging technologies has enabled use as sensors/measurement tools. Here we aimed to evaluate the applicability a fast noninvasive method for estimation total chlorophyll (Chl), Chl a, b, carotenoids (Car) content soybean plants using smartphone camera. Single leaf disc images were obtained Subsequently, same discs, meter was used obtain relative index photosynthetic pigments then determined classic method. RGB, HSB CIELab color...

Sustainability of agriculture with no-tillage (NT) production requires appropriate cover cropping and not a simple random approach any crop species. However, relatively little is known the long-term soil surface impacts different crops in rotation soybean (<i>Glycine max</i>) under NT tropics. We evaluated on aggregation, organic carbon (C) nitrogen (N) fractions, microbial activity Typic Rhodudalf at end 12 years São Paulo state Brazil. Treatments included main plots during winter dry...

Abstract Background A field study with the same crop rotations was conducted to test hypothesis that soil Carbon fluxes and balances could vary according species also mitigate carbon dioxide (CO 2 ) emission. This aimed assess CO emission from C N inputs residue, influences on organic (SOC) total nitrogen (TN) stocks, identifying soybean production systems positive balance. Triticale ( x Triticosecale or sunflower Helianthus annuus are grown in fall/winter; sunn hemp Crotalaria juncea ),...

Além das avaliações entre genótipos, a utilização de técnicas multivariadas possibilita restringirem-se os erros, principalmente quanto à diversidade genética, podendo-se, assim, prever combinações com maior efeito heterótico, além da possibilidade recuperação dos genótipos superiores. Objetivou-se, este trabalho, avaliar divergência genética 18 cultivares soja, por meio seis caracteres morfoagronômicos. Foi realizada análise trilha, para averiguar as contribuições direta e indireta desses...

DISPERSIVE X-RAY FLUORESCENCE SPECTROMETRY (EDXRF).This study aimed to evaluate the chemical elements levels in soil, submitted different management systems and use by Energy Dispersive X-Ray Fluorescence Spectrometry -EDXRF.The were T1 -agro forestry (SAF), T2 -Native Field (CN), T3 Forest (NM), T4 -Tillage (PF); T5 -conventional tillage system (SPC) T6 -System (NT).Samples collected at 0-10 10-20 cm, dried ground for analysis EDX-720.The soil showed no difference average concentrations of...

The aim of the present work was to determine relationship between photosynthetic pigments extracted in dimethyl sulfoxide (DMSO) and readings obtained by portable chlorophyll meter, ClorofiLOG® 1030, generate mathematical models that are able report contents carotenoids leaves castor oil plant. This conducted at Embrapa Cotton, located city Campina Grande, state Paraíba, Brazil, October 2010. For indirect analysis, equipment used read leaf discs different shades green. these then determined...

This study was carried out in the Parque Municipal das Araucárias, located municipality of Guarapuava (PR) from May (06) to April (07). Its aim investigate which plants are used by Megachile (Moureapis) sp provisioning larvae, and verify if this bee is oligolectic or polilectic. The collection during bees activity period an area covering a 500 m radius where nests had been built. A sample pollens founded flowers make permanent slides using acetolysis method with aid light microscope, all...

In addition to improving sustainability in cropping systems, the use of a spring and winter crop rotation system may be viable option for mitigating soil CO2 emissions (ECO2). This study aimed determine short-term ECO2 as affected by rotations management over one soybean cycle two no-till experiments, assess yields with lowest ECO2. Two experiments were carried out fall-winter follows: i) triticale sunflower grown Typic Rhodudalf (TR), ii) ruzigrass, grain sorghum, ruzigrass + sorghum Rhodic...

Objetivou-se, com o presente trabalho, relacionar pigmentos fotossintéticos extraídos de modo clássico em laboratório leituras obtidas pelo clorofilômetro portátil ClorofiLOG 1030, folhas gergelim, por meio modelos matemáticos. O trabalho foi realizado dezembro 2010, na Embrapa Algodão, onde foram retirados discos foliares gergelim para serem mensurados os índices clorofila do portátil. Os submetidos à extração dos fotossintéticos, utilizando-se 5 mL dimetilsulfóxido (DMSO) e mantidos...

A atividade microbiana não se constitui apenas como bom indicador da qualidade do solo, mas é influenciada pela adição de carbono no sistema, o qual serve substrato aos micro-organismos que aumentam sua e a liberação CO2, compreendendo respiração edáfica solo. Objetivou-se, neste trabalho, avaliar em diferentes tipos solo com torta mamona resíduo têxtil algodão. O trabalho foi conduzido casa vegetação na sede Embrapa Algodão, delineamento blocos casualisados esquema fatorial 4 x 3, quatro...

O objetivo do presente trabalho foi gerar modelos matemáticos capazes de reportar os pigmentos fotossintéticos e proteína solúvel nas folhas Jatropha curcas por meio da relação entre leituras realizadas espectrofotometria clássica clorofilômetro, ClorofiLOG® 1030. realizado na Embrapa Algodão, cidade Campina Grande (PB). Para a análise indireta, usado o equipamento portátil para em discos foliares com diferentes estádios desenvolvimento. A clorofila nestes então determinada usando método...

O presente trabalho objetivou estimar a divergência genética entre ecótipos de Urochloa brizantha com base na análise descritores quantitativos, qualitativos e sua conjunta fim selecionar os promissores para liberação como cultivares desta espécie. Oito (B1, B2, B3, B4, B5, B6, B8) cultivar 'Marandu' U. foram implantados em piquetes, 1000m2 cada, duas repetições. Foram avaliados cinco quantitativos dez no período seco das águas. Os foram: área foliar, comprimento largura lâminas foliares,...

Two experiments with 25 maize commercial hybrids were carried out in a direct sowing system Southern Brazil the harvests of 2009/2010 and 2010/2011. Quantitative descriptors used objective determining genetic divergence relative contributions traits among for extraction inbred lines. This study was Oxisol soil using randomized block design four replicates. Data subjected to combined analysis variance, based on multivariate analyses, Tocher average linkage (UPGMA) cluster generalized distance...

Secondary compounds produced by plants are considered an alternative method of weed suppression but can cause negative effects on crops in succession, especially a no-tillage system, due to the degradation crop residues with allelopathic potential. The objective this work was analyze influence foliar aqueous extracts Brassica napus germination and initial development seedlings Phaseolus vulgaris. extract prepared as stock 10 % weight/volume solution, diluted into treatments relative...

Abstract Lime and phosphogypsum applications are well‐established practices in weathered soils, their surface application under no‐till (NT) can affect soil physical attributes C N fractions. This study determined the long‐term (10‐yr) effects of lime to on fractions a tropical NT field. The experimental design was randomized block with four treatments replications. following were applied October 2002, November 2004, 2010, respectively: limestone (2,000 kg ha −1 ), (2,100 ) plus ). In...

Objetivou-se com este estudo avaliar, por meio de caracteres quantitativos, a dissimilaridade genética entre cultivares girassol em diferentes localidades, além da concordância os métodos, visando à extração linhagens para possíveis cruzamentos. Foram cultivados oito híbridos duas localidades no noroeste do Rio Grande Sul, solo predominantemente tipo Latossolo Vermelho distrófico. utilizados métodos multivariados determinar divergência genética, utilizando distância generalizada Mahalanobis....

The addition of urban and industrial waste products to agriculture not only provides them with an adequate environmental destination but also increases the nutrient content negative charges in soil, especially naturally acidic tropical soils high phosphorus-fixing capacity, just as liming does relation dependent pH. Both cases make it possible favor availability phosphate fertilization. aim this study was assess interactions between application composted sewage sludge (SSS) soluble...

O estresse salino diminui o potencial osmótico da solução do solo causando hídrico, provocando efeitos tóxicos nas plantas que resultam em injúrias no metabolismo e desordens nutricionais, comprometendo assim crescimento das plantas, resultando menor produção. silicato de cálcio magnésio pode desempenhar a mesma função calcário, além fornecer silício para as podendo ainda, contribuir resistência ao salino. Nesse sentido, objetivou-se com esse trabalho avaliar efeito mamoneira BRS Energia...

The flamboyant tree (Delonix regia) is known for its exuberant flowering.It shows great variation in seeds viability, depending on the cutaneous water proofing, requiring processes to break dormancy.The objective of this study was evaluate methods breaking physical barrier seeds.In greenhouse, were subjected different treatments overcome restriction: mechanical scarification ventral part; thermal shock with soaking at 80 °C 10 min; sulfuric acid, and control, without intervention.It observed...

The current study aims to determine critical P levels in different soil classes and their availability for castor bean initial growth.Extraction was done using Mehlich-1 ion-exchange resin.The experiment conducted a greenhouse, randomized blocks design with the application of five doses, which were previously set each four experimental soils (TCo: Chromic Orthic Luvisol; CXbe: Eutrophic Haplic Cambisol; CXve: Typical RY: Fluvic), repetitions 40 days.In end experiment, plants harvested shoot...