ABSTRACT
ABSTRACT Fertilization in areas of forest plantations is needed to supplement plants´ nutritional needs until harvest. An experiment was performed to check the influence of fertilization on levels of ash, carbon and C/N relation in Schizolobium amazonicum. Soil liming was performed and fertilization occurred after 15 days of incubation. S. amazonicum seedlings were produced and submitted to fertilization with N, P and K: N = 0, 40, 80 and 120 kg ha-1; P2O5 = 0, 50, 100 and 200 kg ha-1; K2O = 0, 50, 100 and 200 kg ha-1. The plants were measured after 180 days. The seedlings of 20 treatments with the highest increase in height and diameter were transplanted to the field. Soil was fertilized and limestone was spread; seedlings were distributed into randomized blocks, with six replications. After 12 months, the plants were removed to determine ash, organic carbon, C/N relation contents. The ashes were submitted to digestion to determine nutrient concentrations. Fertilization influenced the levels of ash and organic carbon and C/N relation in S. amazonicum. Results indicate that the species has a potential for energy production.
Subject(s)
Soil/chemistry , Carbon/analysis , Fertilizers , Coal Ash/analysis , Fabaceae/drug effects , Fabaceae/chemistry , Nitrogen/analysis , Phosphorus/chemistry , Potassium/chemistry , Reference Values , Time Factors , Carbon/chemistry , Forests , Reproducibility of Results , Coal Ash/chemistry , Fabaceae/physiology , Nitrogen/chemistryABSTRACT
Objetivou-se avaliar a eficiência de produção, a concentração de nitrogênio e sua correlação com a leitura SPAD nos capins Marandu, Decumbens e Convert submetidos à adubação nitrogenada. O experimento foi realizado em casa de vegetação, na Universidade Federal de Mato Grosso, Campus de Rondonópolis. O delineamento experimental foi inteiramente casualizado, com 15 tratamentos e quatro repetições, arranjados em esquema fatorial 3x5, com três gramíneas forrageiras e cinco doses de nitrogênio. As espécies forrageiras utilizadas foram capim-marandu (Brachiaria brizantha cv. Marandu), capim-decumbens (Brachiaria decumbens cv. Basilisk) e capim-convert (Brachiaria hibrida cv. Mulato II) submetidas às doses de nitrogênio de 0; 100; 200; 300 e 400 mg dm-3. Cada parcela consistiu em um vaso de 5 dm3 com cinco plantas. Realizou-se três cortes em intervalos de 30 dias. Foram avaliadas a concentração de nitrogênio, eficiência no uso de nitrogênio para produção de parte aérea e a leitura SPAD. A maior concentração de nitrogênio na parte aérea ocorre nos capins Marandu e Convert. Há maior eficiência no uso de nitrogênio para produção da parte aérea nos capins Decumbens e Convert. A leitura SPAD possui correlação positiva com concentração de nitrogênio nos capins Marandu e Convert.
This study aimed evaluate production efficiency, nitrogen concentration and its correlation with SPAD reading in palisadegrass, signalgrass and convertgrass submitted nitrogen fertilization. The experiment was made in greenhouse at the Universidade Federal do Mato Grosso, campus Rondonopolis. The experimental design was completely randomized design with 15 treatments and four replications, arranged in a 3x5 factorial design, with three grasses and five nitrogen doses. The species forages were palisadegrass (Brachiaria brizantha cv. Marandu) signalgrass (Brachiaria decumbens cv. Basilisk) and convertgrass (Brachiaria hibrida cv. Mulato II) subjected to nitrogen levels of 0, 100, 200; 300 and 400 mg dm-3. Each plot consisted pots of a 5 dm3 with five plants. Three cuts are made at intervals of 30 days. Were evaluated nitrogen concentration, shoots nitrogen efficiency production and SPAD reading. The highest nitrogen concentration in shoot occurs in grasses Marandu and Convert. There is more efficient use of nitrogen for the shoots production in signalgrass and convertgrass. The SPAD reading has a positive correlation with nitrogen concentration in palisadegrass and convertgrass.