O potencial produtivo do feijão-caupi é determinado pelos fatores edafoclimáticos, principalmente por fatores de solo e adubação. É considerado uma planta exigente em nutrientes, em função do pequeno e pouco profundo sistema radicular e do ciclo curto. A análise geoestatística da variabilidade do solo pode indicar alternativas de manejo. Com isso esse trabalho teve por objetivo analisar características morfofisiológicas da cultura do feijoeiro através de semivariogramas, a fim de qualificar as melhores regiões produtivas do talhão. Foram realizadas as seguintes avaliações: a altura da planta, diâmetro do caule, clorofila A, B e total. A dependência espacial foi analisada por meio de ajustes de semivariogramas. Os valores das clorofilas A, B e total apresentam-se autocorrelacionados no espaço. O diâmetro de caule apresenta um moderado grau de dependência espacial que correspondeu a 31 %, para os dados analisados. A altura de planta apresenta uma fraca grau de dependência espacial que equivale apenas 9%. e efeito pepita ocorreu para os dados analisados

This study aimed to evaluate the response curve of phosphorus fertilization to the development and productivity of Salvia hispânica L. in Cerrado soils in the South of Tocantins. The Chia seeds used in the experiments came from producers in the region of Katueté -Paraguay. The experiments were carried out in the experimental area at the Federal University of Tocantins, University Campus of Gurupi-TO, in the agricultural years 2014/2016, through a randomized block design with four repetitions. The treatments consisted of five levels of phosphorus fertilizer (0, 30, 60, 90 e 120 kg ha −1 ). At 120 days after emergence, the following characteristics were evaluated plant height, upper stem height, stem diameter, bunches number, length of bunches, and grain Productivity. The data were submitted to analysis of variance and regression at the 5% probability level by the F test. The analysis of the results showed that the doses of 30 and 60 kg ha −1 of phosphorus influenced positively in the most development and productivity in the culture of Chia in the harvest 2014/2015. The results also showed that increasing doses of phosphorus had not positive effects in the agronomic characteristics at the cultu re of Chia n the harvest 2015/2016. The maximum grains Productivity found in the isolated doses of P was superior to 157 kg ha −1 .

Lithium (Li) is an important alkali metal that exists in the elemental form of nature. Thus, the objective was to evaluate the effect of foliar fertilization with doses of lithium hydroxide on the development and productivity of two chia genotypes, in the south of the state. The experiment was carried out at the Federal University of Tocantins, Campus de Gurupi-TO, in the agricultural year 2017/18 in pots of 8 dm-3 containing red-yellow dystrophic oxisol, deep and clayey texture, in a randomized block design, under a factorial 5x2 scheme, with four replications. The characteristics of plant height, upper stem height, stem diameter, bunch length, number of bunches, liquid photosynthesis, transpiration, stomach conductance and, after harvest (145 days), thousand grain mass, grain yield and Lí content in the grains were evaluated leaf and soil. The highest concentrations of lithium in the chia grains are obtained with the application of 24.6 g ha-1 and 18.5 g ha-1 of LiOH for the genotypes originating in Paraguay and Argentina, respectively. The best responses in height, length of bunch, number of bunches, lithium content in the grain, mass of a thousand grains, liquid photosynthesis, transpiration and stomach conductance were obtained with the genotype from Paraguay.