<abstract> <p>Beans (<italic>Phaseolus vulgaris</italic> L.) are the most important legume for human consumption, and have essential nutrients for physiological processes. As examples, we can mention Fe and Zn. As a strategy to increase these nutrients in the population's diet, beans stand out as a potential candidate, as it already has high levels of these minerals compared to other foods. The objective of this study was to evaluate 14 bean genotypes from the EPAGRI Bean Genetic Improvement Program, Brazil, regarding Fe and Zn content, availability of Fe and Zn in vitro, amount of phytic acid, tannins, proteins, and moisture. The results showed a high positive correlation between the total amount of Zn with bioavailable Zn; the total amount of Fe, and the total amount of Zn; and the total amount of bioavailable Fe with Zn. Furthermore, there were statistically significant differences for all characteristics evaluated, showing an interesting variability that can be considered for future crosses aiming at nutritional quality.</p> </abstract>
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The use of inoculants revolutionized the soybean production system, increasing grain production, reducing the use of chemical fertilizers, and costs. The inoculation with Bradyrhizobium japonicum and the co-inoculation with more than one type of microorganisms are recommended directly in the seed or in the planting furrow, with high efficiency, bringing beneficial results related to the increase in the number of nodules and improvements in the physiology of the soybean plants. In order to increase productivity bringing new methods of using these microorganisms, this study aimed to evaluate the development of soybean culture under co-inoculation by spraying with Azospirilum brasilense and B. japonicum was carried out, in the vegetative stage. One field experiment was conducted from September to January, harvest of 2018/2019, in the commercial area under no-tillage. The evaluated treatments were: Control (C) without microorganisms; T1 (6x108 mL-1 of A. brasilense and 0 of B. japonicum); T2 (6x108 mL-1 of A. brasilense and 6x109 mL-1 of B. japonicum); T3 (12x108 mL-1 of A. brasilense and 0 of B. japonicum); and T4 (12x108 mL-1 of A. brasilense and 12x109 mL-1 of B. japonicum). The results showed that there was an increase in the number and matter of nodules, plant height, number of pods and grains in the T4 treatment, showing a significant difference mainly in relation to the control. It was concluded that co-inoculation with B. japonicum and A. brasilense by spraying in the vegetative stage proved to be efficient, demonstrating the potential use of this technique.
Cassava is one of the most important socio-economic crops in the world. It is usually cultivated in soils with low fertility and little mechanization, which makes it difficult to increase the crop's productivity and, consequently, economic gains. The aim of this study was to evaluate different types of fertilization (Poultry litter, organomineral fertilizer and rooting) in cassava cultivation in the northwest region of the state of Paraná - Brazil. After 10 months of planting, the variables evaluated were: number of roots, root diameter, root length, shoot height, starch yield and shoot fresh weight. The results were submitted to mean test, principal component analysis and Pearson's R correlation analysis. The results showed that poultry litter presented the best result in practically all the evaluated variables, followed by rooting, which promoted the highest number of roots; in addition, with the exception of the number of roots, all other variables were highly correlated.
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