O objetivo deste trabalho foi avaliar o efeito da aplicação continuada de DLS na produção de massa seca da raiz da aveia preta. O experimento foi conduzido a campo (2016/2017), no município de Campos Novos, SC em SD em consorcio aveia preta/milho. O solo é um Latossolo Vermelho Distroférrico. Os tratamentos compreenderam as doses 100 e 200 m3 ha-1 DLS; adubação mineral solúvel e adubo mineral solúvel combinado com dejeto. Os tratamentos foram organizados em delineamento experimental de blocos ao acaso com quatro repetições. As aplicações dos fertilizantes foram realizadas no mês de outubro de cada ano, sobre a palhada da cultura de inverno. Para avaliação da massa seca da raiz foram realizadas coletas de raízes da aveia em outubro de 2016 onde foram coletadas 2 subamostras em cada parcela, nas camadas de 0-10 e 10-20 cm de profundidade do solo com um trado de ferro cilíndrico com 5,5 cm de diâmetro. Posteriormente as amostras foram encaminhas para laboratório para quantificar a massa seca total de raízes. Foi utilizado o programa estatístico SAS® utilizando Tukey a 5% de significância. Não houve diferença significativa na produção de massa seca de raiz da aveia preta entre os tratamentos com aplicação de DLS e fertilizante mineral. As características físicas e químicas do solo como a densidade e acidez explicam a menor produção de massa seca das raízes da aveia. PALAVRAS-CHAVE: Avena strigosa, Fertilizante, Resíduo orgânico.
The objective of this study was to evaluate how the fertilizer composition, type and application method contribute to the initial growth of Pinus taeda applied at planting. Seedlings from an open-pollinated seed orchard of Pinus taeda were planted on a Humic Dystrudepts soil containing 15 treatments of fertilizer application at planting. Basal diameter (immediately above ground -about 5 cm) and total height were measured on all live plants after six, 12 and 42 months. The basal diameter at six and 12 months ranged from 0.49 to 0.63 cm and 1.64 to 2.15 cm, respectively. The height at six and 12 months ranged from 0.49 to 0.64 m and 0.77 to 1.01 m, respectively, indicating that fertilizing improved this characteristics in ~30%. Fertilizer composition, type and application method contributed to the first year of growth of Pinus taeda. Nevertheless, fertilization response disappeared after 42 months.
The no-tillage vegetable planting system (NTVPS) is a way to integrate production and soil conservation. The study was conducted on a Haplic Cambisol in the municipality of Alfredo Wagner -SC, in 2017. It aimed to evaluate physical attributes and carbon fractions of soil under consolidated NTVPS cultivation for 10 years as compared to thirty-year conventional tillage (CT) and a native forest (NF) on a Haplic Cambisol. The aspects evaluated were: total organic C, soil density (SD), total porosity (TP), macropores, micropores, aggregate stability, resistance to mechanical penetration (PR) and water infiltration into de soil. CT showed higher SD as compared to NTVPS, mainly in the 5 to 10-cm layer, whereas PR was higher in NTVPS, particularly in the 5 to 10-cm layer, thus exceeding the critical limit for this variable. Nevertheless, NTVPS showed greater accumulated water infiltration and infiltration stabilization at 20 minutes. In the native forest, infiltration was lower than that in NTVPS, and the lowest constant infiltration values occurred in CT from the beginning of the test. The NTVPS treatment showed greater efficiency in carbon storage and aggregation as compared to CT, therefore, favorable structural conditions for plant growth.
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