Acúmulo de matéria seca e macronutrientes por cultivares de sorgo sacarino
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2013-07-23
Autores
Soares, Edimar Rodrigues [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
As curvas de acúmulo de nutrientes auxiliam na compreensão das demandas nutricionais de uma cultura. O objetivo deste trabalho foi avaliar o crescimento acúmulo de macronutrientes pelas cultivares de sorgo sacarino CVSW80007, CVSW80147, CVSW82028, CVSW82158. O experimento foi conduzido em uma área de renovação de cana-de-açúcar no município de Uchoa-SP, sendo implantado em janeiro de 2012. As plantas foram coletadas em intervalos de 15 dias a partir do décimo dias após a emergência (DAE). O maior acúmulo de matéria seca, N, P, Mg e S, foi obtido pela cultivar CVSW82028, enquanto a ‘CVSW82158’ extraiu a maior quantidade de K e a ‘CVSW80147,’ de Ca. Os colmos representaram o maior percentual de matéria seca e nutrientes acumulados, com exceção do nitrogênio e do fósforo, em que os grãos corresponderam a maior porcentagem do total absorvido. As cultivares CVSW80007, CVSW82028 e CVSW82158 apresentaram a seguinte ordem decrescente de extração de nutrientes: N>K>Ca>Mg>P>S e a ‘CVSW80147’, K>N>Ca>Mg>P>S. Considerando apenas colmo, a ordem decrescente de exportação de nutrientes é a mesma para todas as cultivares: K>N>Ca>Mg>S>P. No entanto, a sequência decrescente de exportação de nutrientes considerando colmos e grãos, é para as cultivares CVSW80007, CVSW80147 e CVSW82158: K>N>Ca>Mg>P>S e K>N>Mg>Ca>P>S para a ‘ CVSW82028’
Nutrient accumulation curves help us understand the nutritional demands of a crop. The aim of this study was to evaluate the concentration and exportation of macronutrients by the sweet sorghum cultivars CVSW80007, CVSW80147, CVSW82028, CVSW82158. The experiment was conducted in a renewal sugarcane ratoon area at Uchoa county, SP, being deployed in January 2012. The plants were collected in 15 days intervals from the 10th after emergence (DAE). The greatest content of dry matter, N, P, Mg and S, was due to by the CVSW82028 cultivar, while the CVSW82158 extract the greatest amount of K and the CVSW80147 of Ca. The stalks represented the highs percentage of dry matter and nutrient content, except nitrogen and phosphorus, in which grains corresponded to the higher percentage of total absorption. The CVSW80007, CVSW82028 and CVSW82158 cultivars showed the following decreasing nutrient extraction N>K>Ca>Mg>P>S and the CVSW80147, K>N>Ca>Mg>P>S. Considering only the stalks harvest, the decreasing nutrient exportation is the same for all cultivars: K>N>Ca>Mg>S>P. Whereas the decreasing nutrient exportation sequence considering stalks and grain harvest is the following for the CVSW80007, CVSW80147 and CVSW82158 cultivars: K>N>Ca>Mg>P>S and K>N>Ca>Mg>P>S for the CVSW82028
Nutrient accumulation curves help us understand the nutritional demands of a crop. The aim of this study was to evaluate the concentration and exportation of macronutrients by the sweet sorghum cultivars CVSW80007, CVSW80147, CVSW82028, CVSW82158. The experiment was conducted in a renewal sugarcane ratoon area at Uchoa county, SP, being deployed in January 2012. The plants were collected in 15 days intervals from the 10th after emergence (DAE). The greatest content of dry matter, N, P, Mg and S, was due to by the CVSW82028 cultivar, while the CVSW82158 extract the greatest amount of K and the CVSW80147 of Ca. The stalks represented the highs percentage of dry matter and nutrient content, except nitrogen and phosphorus, in which grains corresponded to the higher percentage of total absorption. The CVSW80007, CVSW82028 and CVSW82158 cultivars showed the following decreasing nutrient extraction N>K>Ca>Mg>P>S and the CVSW80147, K>N>Ca>Mg>P>S. Considering only the stalks harvest, the decreasing nutrient exportation is the same for all cultivars: K>N>Ca>Mg>S>P. Whereas the decreasing nutrient exportation sequence considering stalks and grain harvest is the following for the CVSW80007, CVSW80147 and CVSW82158 cultivars: K>N>Ca>Mg>P>S and K>N>Ca>Mg>P>S for the CVSW82028
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Palavras-chave
Sorgo sacarino, Sorgo sacarino - Cultivares, Biocombustíveis, Nutrientes, Marcha de absorção, Biomass energy
Como citar
SOARES, Edimar Rodrigues. Acúmulo de matéria seca e macronutrientes por cultivares de sorgo sacarino. 2013. xi, 29 p. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, 2013.