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• W25179931 abstract "The genus Amaranthus comprises species which, consumed as vegetables, provide essential nutrients to man; they also have a high acceptability among the population. These two factors justify the need to increase their cultivation. Therefore, the purpose of this research was to establish the most adequate physiological state of maturity, to harvest the leaves for human consumption. The field experiment utilized a randomized block design with three treatments and eight replications. These treatments consisted in harvesting the plants at 25, 40 and 60 days after emergence of the seedlings, samples which served to evaluate: plant height, number of leaves, leaf surface area, gross weight (leaves and stems), net weight (leaves), green matter and dry matter yield, as well as protein. The chemical composition of the harvested material was evaluated also in terms of moisture, protein, crude fiber, ether extract, ash, carbohydrate, calcium, phosphorus, iron, beta-carotene and oxalates. The results obtained in the agronomic study were subjected to analysis of variance for the respective design, with significant differences found between treatments for all the variables studied. In its turn, the results of the chemical analysis were analyzed by a completely randomized design, with significant differences obtained for most of the variables studied, except for ether extract, calcium, iron and oxalates. From the nutritional point of view, the first harvest was the most acceptable due to the chemical composition of the plant, in particular protein (29.5%), beta-carotene (33.7 mg%), calcium (2,356.1 mg%), phosphorus (759.1 mg%) and due to its low crude fiber content, only 11.1 g%. It did not occur so from the agronomic point of view, since during this stage, very low yields of green matter (575.9 kg/ha), dry matter (66.6 kg/ha) and protein (19.7 kg/ha) were obtained. At the second harvest, besides obtaining adequate yields of green matter (6,530.4 kg/ha), dry matter (681.8 kg/ha) and protein 154.3 kg/ha), an acceptable composition in its protein content (22.7 g%), beta-carotene (24.1 mg%), calcium (2,279.8 mg%), phosphorus (740.9 mg%) and iron (52.7 mg%) was also obtained. The crude fiber content, on the other hand, was not excessively increased (14.3 g%), from which findings it was concluded that this is the best stage for harvesting, in comparison with the harvests carried out 25 and 60 days after emergence. Finally, it was observed that harvesting at 60 days gave the highest yields in green matter (24,272.8 kg/ha), dry matter (3,452.0 kg/ha) and protein (510.7 kg/ha).(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
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• W25179931 date "1987-03-01" @default.
• W25179931 modified "2023-09-26" @default.
• W25179931 title "[Yield and chemical composition of the vegetal parts of the amaranth (Amaranthus hypochondriacus, L.) at different physiological stages]." @default.
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