Nutrient accumulation in the shoots of physic nut grown in two edaphoclimatic conditions

Abstract

Abstract'The possibility of using physic nut oil as an alternative energy source indicates that it is necessary to carry out studies concerning the absorption and accumulation of nutrients in the distinct phases of development of the crop for the appropriate management of fertilizer application. Given this information, this study aimed to evaluate the accumulation of nutrients in the shoots of physic nut plants, as well as to identify critical nutrient uptake by this crop. The experiments were set up independently in two different locations, from May 2010 to March 2013, and using the same procedures. The locations were characterized as follows: Rhodic Hapludox in the municipality of Curvelo, MG; Typic Quartzipsamment in the municipality of Diamantina, MG. The experiments were conducted in a randomized block design with three replicates, the treatments being the evaluation times of the physic nut plants in both experiments. The collection times were every 30 days from planting of the seedlings in the field for a period of 1,036 days, corresponding to 36 evaluations. After collection, the samples were prepared and submitted to chemical analysis of the nutrient concentration of the plant material. The concentrations were reported as nutrient content of the leaves, stems and fruit of physic nut plants. According to the results, it can be concluded that nutrient accumulation was higher in the edaphoclimatic conditions of Curvelo compared to the conditions of Diamantina. The concentration of macronutrients was in the following order: K>Ca>N>P>S>Mg in Diamantina and N>Ca>K>P>Mg>S in Curvelo. Accumulation of micronutrients in the shoots at 1036 days after planting physic nut seedlings in the field was in the following order: Mn>B>Fe>Zn>Cu in Diamantina and Mn>Fe>B>Zn>Cu in Curvelo. Key words: Nutrition. Absorption. Jatropha curcas L. ResumoCom a possibilidade de utilização do óleo do pinhão-manso como uma alternativa energética, tem-se a necessidade de realizar estudos referentes à absorção e acúmulo de nutrientes nas diferentes fases de desenvolvimento da cultura para manejo adequado da adubação. Diante do exposto, objetivou-se com esse trabalho avaliar o acúmulo de nutrientes na parte aérea do pinhão-manso, bem como, identificar as fazes críticas de absorção de nutrientes por parte dessa cultura. independentemente, onde foram utilizados os mesmos procedimentos, no período de maio de 2010 a março de 2013 em locais distintos caracterizados a seguir: Latossolo Vermelho distrófico no município de Curvelo, MG, e o outro, em Neossolo Quartzarênico Órtico típico no município de Diamantina, MG. Os experimentos foram conduzidos em delineamento experimental em blocos casualizados com três repetições, sendo os tratamentos as épocas de avaliação das plantas de pinhão-manso para ambos os experimentos. As épocas de coletas foram a cada 30 dias a partir do plantio das mudas no campo num período de 1.036 dias que corresponderam a 36 avaliações. Após a coleta, as amostras foram preparadas e submetidas às análises químicas do material ...

Pruning and fertilization effects on Jatropha yields under smallholder’s conditions in a Tropical Dry Forest from Ecuador

“…The concentration of Ca in the fruit was very similar to that of K. This element must be available in sufficient quantity during the jatropha production phase (Magalhães et al, 2018). The Ca/Mg ratio in the present study indicates an Mg deficiency, and the Mg/K ratio indicates a deficiency of this element relative to K. According to Xu and Wang (2011), Mg plays a substantial role in P transport and oil and fat formation in the tree.…”

“…Jatropha usually proliferated in the first two years after planting, and N is essential for the assimilation of carbon and the formation of new tree organs. According to Magalhães et al (2018) the maximum accumulation of nutrients in jatropha plants is reached at 2.8 years in leaves, stems, fruits, and shoots for N, P, and K, coinciding with the maximum accumulation of dry matter in the tree. Magalhães et al (2018) found that N accumulated in more significant proportions in the stem than in the leaves, while N levels in the leaves were subject to seasonal variations.…”

“…The high demand for K is required for dry seed production, which depends on the site soil conditions. A high K concentration is important for the formation of jatropha fruit (Magalhães et al, 2018). Lima et al (2011) reported that young leaves had the highest levels of this element and were associated with greater photosynthetic activity.…”