PPGEA

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Navegando PPGEA por Autor "012.065.511-00"

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    Características fitométricas de trigo adubado com nitrogênio : potássio e nitrogênio : enxofre no cerrado mato-grossense
    (Universidade Federal de Mato Grosso, 2020-02-28) Paula, Raphael Pereira França de; Silva, Edna Maria Bonfim da; 960.432.454-34; http://lattes.cnpq.br/8660058048761423; Silva, Edna Maria Bonfim da; 960.432.454-34; http://lattes.cnpq.br/8660058048761423; Oliveira, Maria Aparecida Peres de; 975.423.931-20; http://lattes.cnpq.br/8667237742538392; Nunes, João Ângelo Silva; 012.065.511-00; http://lattes.cnpq.br/3575958560852266
    The wheat crop has been cultivated mainly in the southern region of Brazil, with the potential to expand to other regions such as the Midwest. High yields have been achieved in this region, due to genetic improvement, where cultivars are developed adapted to the region's climate and through fertilization management. The Cerrado soils have low natural fertility, however, with the correction of soil acidity and the application of fertilizers there is an increase in the productivity of agricultural crops. In this context, the objective was to evaluate the phytometric characteristics of irrigated wheat fertilized with combinations of nitrogen and potassium and nitrogen and sulfur in two consecutive years of cultivation in the Cerrado of Mato Grosso. Two experiments were carried out simultaneously: experiment 1: nitrogen / potassium combinations and experiment 2: nitrogen / sulfur in the years 2018 and 2019, in the experimental area of the Federal University of Mato Grosso, Campus de Rondonópolis. The statistical design used was in randomized blocks in a fractional 52 factorial scheme. In the first experiment five doses of nitrogen (0, 70, 140, 210 and 280 kg ha-1 ) were used with five doses of potassium (0, 50, 100, 150 and 200 kg ha-1 ) and in the second experiment five doses were used nitrogen (0, 70, 140, 210 and 280 kg ha-1 ) with five sulfur doses (0, 25, 50, 75 and 100 kg ha-1 ), with four replications. The analyzed variables corresponding to the growth and development of wheat plants occurred at 15, 30 and 45 days after emergence (DAE), evaluating plant height, number of leaves, number of tillers, lodging, ear length, ear diameter and stalk length in the two years of cultivation. The response variables were subjected to analysis of variance and regression test, both with up to 5% probability of error by Software R (R Core TEAM, 2018). The phytometric characteristics of Cultivar BRS 394 were influenced by the doses of nitrogen: potassium and nitrogen: sulfur applied to the soil. Combinations of nitrogen doses from 187.86 to 262.22 kg ha-1 combined with potassium doses from 74.62 to 183.92 kg ha-1 , provide the best responses to the evaluated phytometric and productive variables. And the combinations of nitrogen doses from 204.83 to 265.49 kg ha-1 with sulfur doses ranging from 3.16 to 131.76 kg ha-1 , provide the maximum results of the analyzed variables. Thus, nitrogen fertilization influenced by doses of potassium and sulfur applied to the soil, provide the best results for the cultivation of wheat cultivar BRS 394 grown in Cerrado mato grossense.
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    Deficiência hídrica e adubação nitrogenada no cultivo do minimilho no cerrado
    (Universidade Federal de Mato Grosso, 2020-10-27) Lira, Melkezedeque Alves; Koetz, Marcio; 892.874.600-00; http://lattes.cnpq.br/8918968565917194; Koetz, Marcio; 892.874.600-00; http://lattes.cnpq.br/8918968565917194; Silva, Edna Maria Bonfim da; 960.432.454-34; http://lattes.cnpq.br/8660058048761423; Nunes, João Angelo Silva; 012.065.511-00; http://lattes.cnpq.br/3575958560852266
    Baby corn is the name given to young ear of corn, before pollination. Its cultivation occurs in a cycle of 70 days, a period that frames the baby corn as a vegetable, being recognized as short, which may represent an option to supplement the income of small farmers. Nitrogen and water are some of the factors that most affect the development of crops in general. Thus, the objective was to study the influence of the use of nitrogen in relation to water deficiency in the cultivation of baby corn. The experiment was installed in subdivided plots, in a randomized block design in a 5x5 factorial arrangement and 4 repetitions, with 5 irrigation layers (21, 29, 37, 45 and 53% of the crop evapotranspiration (ETc)) and sub -plots with 5 doses of nitrogen (0, 50, 100, 150 and 200 kg ha-1). The first evaluation was carried out at 32 days after the beginning of the experiment and the second evaluation 15 days after the first. The harvest started at 68 days after sowing and was completed at 116 days after sowing. Non-destructive phytometric analyzes were performed, such as plant height, stem diameter, number of leaves and Falker® chlorophyll index at 32 and 47 days after sowing and number of ears, diameter, length, weight of spikelets with and without straw. during the harvest period, in addition to water use efficiency, and the data were analyzed with the aid of the SISVAR statistical program. No interaction was found between the factors for any of the variables analyzed. At 32 and 47 days after sowing the best results pointed to a higher efficiency of the dose of 150 kg ha-1 of nitrogen and 44% of ETc in the characteristics of growth and development of corn, while for the production of spikelets the adjustment was to the quadratic linear regression model for both irrigation levels and nitrogen doses, however, when the values of both factors increased, the spikelets produced were smaller, causing a greater number of spikelets to fit the pattern commercial. The maximum efficiency of water use was obtained with the application of a larger water layer and nitrogen dose for this experiment. The non-interaction between factors in all variables does not allow an adequate assessment of the influence of nitrogen in the cultivation of minimiho in conditions of water deficiency, being appropriate new experiments using higher doses of nitrogen and irrigation depths for a better evaluation of the baby performance under these conditions.