RESUMOObjetivou-se com este estudo avaliar os efeitos da aplicação de zinco no desenvolvimento e na nutrição do capimtanzânia. O delineamento experimental foi inteiramente casualizado, constituídos de seis doses de zinco (0,15,30, 60, 120 e 240 mg dm -3 ) e quatro repetições. Cada unidade experimental foi constituída de vaso preenchido com Latossolo Vermelho distrófico (Zn = 0,4 mg dm -3 ). Foram realizados dois cortes, o primeiro após 53 dias da transplantação das mudas e o segundo 35 dias após o primeiro corte. Avaliou-se a concentração de zinco no solo, o teor de zinco foliar, o número de perfilhos, número de folhas, altura de plantas, massa seca da parte aérea, do sistema radicular e da planta inteira. As doses de zinco influenciaram a concentração de zinco no solo e na planta, e a produção de massa seca do capim-tanzânia, especialmente do primeiro corte. O capim-tanzânia apresenta alta tolerância à toxicidade de zinco, apresentando nível crítico tóxico de 273 mg kg -1 . Palavras-chave: Panicum maximum; fertilidade; micronutriente; nutrição; pastagem; solo. ABSTRACTIt was aimed to assess the effects of zinc in the development and nutrition of Tanzania grass. The experimental design used was fully randomized, consisting of six doses of zinc (0, 15, 30, 60, 120 and 240 mg dm -3 ) and four repetitions. The experimental unit was formed in a vase filled with a Red Latosol dystrophic (Zn = 0.4 mg dm -3 ). There were two cuts, the first after 53 days of transplanting seedlings and the second 35 days after the first cut. Was evaluated the concentration of zinc in the soil, the content of zinc leaf, the number of tillers, number of leaves, plant height, the dry mass of the shoot, root system and the whole plant. The doses of zinc influenced the concentration of zinc in soil and plant, and production of dry mass of Tanzania grass, especially the first cut. The Tanzania grass shows high tolerance to the toxicity of zinc, and toxic critical level of 273 mg kg -1 .
Dendrobium nobile Lindl. is one of the most cultivated and distributed orchids around the world; however, information on its nutrition is scarce. Our objective was to study the plant development and nutrient accumulation in plants of D. nobile weekly fertilized with 100 mL Sarruge nutrient solution at 75% concentration. One plant per replication was randomly collected every month, along 12 months, totaling four plants. Dry matter (DM) and nutrient accumulation were determined for the different plant parts. Plants had already accumulated nearly 50% of total DM up to the flowering stage (240 days after first fertilization, DAFF). Order and amount of accumulated nutrients, at 360 DAFF, was, in mg per plant: K (701.07) > N (339.44) > Ca (289.03) > Mg (135.44) > P (118.83) > S (23.56); in mg per plant, it was Fe (14,122.35) > Zn (5,277.82) > Mn (3,216.87) > B (1,253.02) > Cu (271.25).
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