Lavender is an aromatic ornamental plant that is used widely in the perfume, pharmaceutical, cosmetical and food industries. That is why it is important to study ways to promote a production of lavender raw material. For this, four experiments were carried out in order to study the germination and initial in vitro development of lavender. In the first part the efficiency of the use of hydrogen peroxide in the pre-treatment of seeds inoculated in culture media with different concentrations of gibberellic acid was evaluated. Besides that, the influence of the use of Growlux lamps and white fluorescent lamps on plantlets cultivated in MS and LS media at salts concentrations of 50 and 100% was evaluated. Finally, the effect of the gibberellic acid, putrescine, spermine and spermidine in different concentrations was evaluated. Better results were estimated when hydrogen peroxide pretreatment was applied to the seeds with subsequent inoculation in a medium containing 2,5 mg L^-1 of gibberellic acid. The use of Growlux lamps did not influence the characteristics observed when compared to the use of white fluorescent lamps, however it was concluded that the species develops more in a LS medium. Concerning the use of polyamines was found that germination, aerial part and number of leaves of the seedlings were generally favored at the concentration of 0,5 mg L^-1 except when spermine was applied, which resulted in a lower number of leaves under this condition.

Devido a importância econômica e à alta demanda nutricional da cultura da batata busca-se cada vez mais por fontes de fertilização capazes de suprir as necessidades da cultura, ao mesmo tempo que se promove um manejo mais sustentável e eficiente. Diante desse cenário, tem se destacado a busca por fontes de fertilização que contenham em sua composição uma fração orgânica, como forma de proporcionar um fornecimento nutricional adequado às culturas, tanto agronomicamente quanto ambientalmente. Dessa forma, o objetivo deste trabalho foi realizar uma revisão da literatura existente sobre o uso de fertilizante organomineral na batata identificando aspectos como origem e importância, fertilização e demandas nutricionais dessa cultura, sustentabilidade dos sistemas agrícolas e fertilizantes organominerais. Buscou-se por dados acadêmicos publicados até 2024 em bases de dados eletrônicos utilizando termos relacionados com organomineral, resíduos e substâncias orgânicas, fertilização em hortaliças, batata e sustentabilidade. Como resultado da revisão, destaca-se que os fertilizantes organominerais demonstram ser uma fonte alternativa de fertilização para o cultivo de hortaliças como a batata por possuir em sua composição uma fração orgânica combinada com fontes minerais. Essa constituição promove uma série de benefícios para toda a cadeia produtiva, desde a fabricação dos fertilizantes até os benefícios para o sistema solo-planta.

Given the importance of potatoes in Brazilian agribusiness and the need to establish sustainable production systems, interest has increased in the implementation of more efficient fertilization methods for the cultivation. Thus, the objective of this study was to evaluate the response of the cultivars Ágata and Atlantic to fertilization with a pelleted organomineral source in comparison to conventional fertilization performed with a mineral source. A causal block design was used with five treatments [100% of the recommendation for fertilization with mineral sources 03-35-06; and 100%, 80%, 60%, and 40% of the recommended dose with organomineral fertilizer (02-20-05)] in four replications, totaling 20 plots. The application of the organomineral in plant fertilization can be an interesting source of fertilizer for the cultivation of Ágata and Atlantic potatoes and can be applied with dose adjustments. For the cultivar Ágata, the doses of 100% and 80% organomineral fertilizer together with mineral fertilization resulted in the highest total yields. The lower doses (60% and 40%) made it possible to obtain a higher percentage of special potatoes, considered to be of the highest commercial value, than 80% of the organomineral fertilizers and 100% mineral standard. For the Atlantic cultivar, the total yield responses to organomineral were like those obtained with exclusively mineral fertilization. These findings indicate that organomineral fertilizers can be used efficiently with adjusted doses, maintaining productivity and tuber quality while potentially reducing fertilizer input costs and environmental impacts, contributing to more sustainable potato cropping systems.

Common scab caused by Streptomyces spp., causes considerable potato yield losses worldwide. Here, we aimed to study the correlation between common scab severity, and soil chemical characteristics and leaf nutrient contents. Data on potato yield, scab incidence, and soil characteristics obtained from 26 sampling points were subjected to multivariate analysis and then analyzed for spatial dependence. For most soil nutrients and pH, there was a inverse relationship with scab severity. Conversely, organic matter, S, Ca, and Mg contents positively correlated with scab damage. Leaf N, P, K, Ca, Mg, S, Cu, Mn, and Fe contents were inversely related severity, whereas B and Zn concentrations were closely associated with the disease. Differences in the relationship between foliar and soil nutrient contents greatly contribute to the complexity with which soil conditions affect the growth of Streptomyces spp. in the soil, and the plant chemical-physiological conditions. Our findings revealed that soil and foliar nutrient status affected the incidence of scab. Although most nutrients suppressed the disease, B and Zn showed a complex association with severity. These discrepancies likely arose from soil conditions, as pH and organic matter drive Streptomyces activity, while plant physiology modulates nutrient uptake and infection resistance.