Intera o de doses de calc芍rio e zinco nas caracter赤sticas morfol車gicas e nos componentes de produ o da mamoneira = Interaction of lime and zinc levels in the morphologic characteristics and production components of castor bean plants

作者：erica Pontes Leles; Dirceu Maximino Fernandes; Jose Iran Cardoso da Silva; Leandro Augusto Andrade Fumes

来源：Acta Scientiarum - Agronomy, 2010.

• Ricinus communis L.
• mamona
• corretivo de acidez
• micronutriente
• castor bean
• acidity corrective
• micronutrient

O objetivo deste trabalho foi avaliar a influ那ncia de doses de calc芍rio e zinco e, a intera o destes sobre o desenvolvimento da cultura da mamona. A hip車tese deste trabalho 谷 que o aumento de doses de calc芍rio diminui a disponibilidade de zinco no solo para a planta.O experimento foi desenvolvido em estufa para cultivo protegido, sem controle de temperatura, em vasos com 17 dm3 de Latossolo Vermelho distr車fico, textura m谷dia. O delineamento experimental foi em blocos casualizados, com quatro repeti es. Os tratamentos foram arranjados num esquema fatorial 3 x 5, sendo os fatores: tr那s satura es por bases (40, 60 e 80%) e cinco doses adicionadas de Zn (0,5; 1,0; 2,0; 4,0 e 8,0 mg dm-3 de solo). Apenas uma planta por vaso foi conduzida at谷 174 dias ap車s emerg那ncia (maturidade fisiol車gica do racemo prim芍rio), quando foi avaliada a produ o. Maiores doses de calc芍rioresultaram em maior n迆mero de gr os por planta e MS dos gr os por planta. Houve intera o V% e Zn na altura da planta, massa seca da raiz, comprimento da parte masculina e total do racemo. No entanto, nenhum destes incrementos refletiu em diferen a significativa na massa de 100 gr os da mamoneira. The objective in this work was to evaluate the effects of lime and zinc levels, as well as their interaction on development in castor bean plants. The hypothesis of this work is that the lime levelsreduce the zinc availability in soil for the plant. The experiment was carried out under greenhouse conditions without temperature control, in pots with 17 dm3 of ＆dystrophic Red Latosol＊, medium texture. The statistical design was of randomized blocks, in a 3 x 5factorial scheme, with four replicates. The treatments consisted of liming to reach three basis saturations: 40, 60 and 80%, combined with five zinc levels: 0.5, 1.0, 2.0, 4.0 and 8.0 mg dm-3. Only one plant per pot was grown up to 174 days after emergence (first mature raceme), at which point the morphologic and production components of plants were evaluated. Higher lime levels resulted in greater number of seeds per plant and dry matter of seeds per plant. There was interaction of basis saturation and zinc in plant height, in dry matter of root and in length of raceme (masculine part and total). However, none of these increases reflected a significant difference in weight of 100 castor bean seeds.