RESUMOObjetivou-se neste trabalho avaliar o comportamento do inhame, cultivar Da Costa, adubado com fontes e doses de matéria orgânica. O delineamento experimental foi em blocos casualizados distribuídos em esquema fatorial 6 x 2, correspondendo a seis doses (0, 6, 12, 18, 24 e 30 t ha -1 ) e duas fontes de matéria orgânica (esterco bovino e caprino), em três repetições. O comprimento de túberas aumentou de forma linear com valor máximo de 27,5 cm na dose de 30 t ha -1 de esterco caprino e o esterco bovino proporcionou túberas com comprimento médio de 23,64 cm. O diâmetro foi de 9,1 e 9,3 cm nas doses de 20 e 21,6 t ha -1 de esterco caprino e bovino, respectivamente. A máxima massa média de túberas de 1,4 kg foi obtida com a dose 17,4 t ha -1 de esterco caprino e, em função do fornecimento das doses de esterco bovino obteve-se o valor médio de 1,11 kg. A dose de 20,9 t ha -1 de esterco caprino proporcionou a máxima produtividade comercial de túberas de 14 t ha -1 e produtividade média de 10,1 t ha -1 com o uso de esterco bovino. O esterco caprino foi superior ao bovino e a dose em torno de 20 t ha -1 de ambos os estercos promove os maiores valores nas características avaliadas. Palavras-chave: Dioscorea cayennensis, adubação orgânica, produtividade de túberasProduction of yam in a soil fertilized with different sources and rates of organic matter ABSTRACT The objective of this study was to evaluate the behavior of yam, variety Da Costa, fertilized with different sources and rates of organic matter. The experimental design was a randomized complete blocks distributed in a factorial 2 x 6, corresponding to six rates (0, 6, 12, 18, 24 and 30 t ha -1 ) and two sources of organic matter (cattle and goat manure), with three replications. The length of tubers increased linearly with maximum value of 27.5 cm at a rate of 30 t ha -1 of goat manure and the bovine manure provided tubers with mean length of 23.64 cm. The diameter was of 9.1 and 9.3 cm in rates of 20 and 21.6 t ha -1 of goat and bovine manure, respectively. The maximum mean mass of 1.4 kg was obtained with the rate 17.4 t ha -1 of goat manure and in function of rates of bovine manure the mean value obtained was 1.11 kg. A rate of 20.9 t ha -1 of goat manure provided the maximum commercial productivity of tubers of 14 t ha -1 , while mean productivity of 10.1 t ha -1 was obtaines with the use of bovine manure. The goat manure is better than bovine manure and the rate around of 20 t ha -1 of both the manures promoted the highest values of the evaluated characteristics.
Zucchini is traditionally used in human consumption, however, the scarcity of information, especially about fertilization and the physiological aspects of this crop, constitutes a major obstacle its cultivation and commercialization. The objective was evaluate the chlorophyll content and gas exchange under cattle bio-fertilization and different sources of nitrogen. The work was carried a randomized block experimental design was used in a factorial scheme 5 x 3 + 1 composed of five cattle bio-fertilizer concentrations, three sources of nitrogen and an additional treatment without nitrogen. The levels of chlorophyll a, b and total, liquid photosynthesis, transpiration, internal CO2 concentration, stomatal conductance, instantaneous water use efficiency, and instantaneous carboxylation efficiency were evaluated. The studied variables were influenced by the interaction between the concentrations of the cattle bio-fertilizer and the nitrogen sources, except for the chlorophyll b content and the instantaneous water use efficiency, which responded only to the nitrogen sources. Ammonium sulfate and urea increased increase the physiological variables evaluated. The combination of ammonium sulfate with bio-fertilizer promoted an increase in chlorophyll a, total chlorophyll, liquid photosynthesis, transpiration, internal carbon concentration, stomatal conductance, and instantaneous carboxylation efficiency. The cattle bio-fertilizer in the soil without nitrogen did not increase the physiological variables evaluated.
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