Matter partitioning, nutrient composition and nutritive value of Amaranthus Cruentus as influences by plant age

Nigerian Journal of Horticultural Science Pub Date : 2005-10-19 DOI:10.4314/NJHS.V9I1.3375

M. Okelana

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Abstract

Growth analysis of Amaranthus cruentus was carried out from the 4 th to the 16 th week after sowing (WAS). Weights of both fresh and dry shoot and root increased with plant age. Fresh weight of tender shoot, comprising the crisp leaf and soft stem portions located within the upper half of the plant height, was highest at 7 th WAS when it constituted 61% of fresh total shoot weight and 50% of plant fresh weight, and lowest by 16th WAS. Phosphorus and protein contents of the shoot declined as from the 7 th -10 th WAS, while shoot crude fibre increased throughout the plant growth period, building up more steeply after the 10th WAS. Stem calcium increased from 0.3%, at 4 WAS to 0.7% by week 13, and in the leaf from 0.25% at 4 WAS to a peak of about 0.35% at 10 WAS. The nutrient profile and tissue hardening pattern in the plant shoot implied that the vegetable would best be harvested around the 7 th WAS when its tender shoot would constitute maximum proportion, about 61%, of the total plant shoot weight, and metabolites, such as P and protein, abound most. Nigerian Journal of Horticultural Science Vol. 9 2005: 22-28

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苗龄对苋菜物质分配、营养成分和营养价值的影响

对播后第4 ~ 16周的苋菜进行了生长分析。随着株龄的增加，鲜、干茎和根的重量均增加。嫩枝鲜重，包括位于株高上半部分的脆叶和软茎部分，在第7个was最高，占鲜枝总重的61%和植株鲜重的50%，在第16个was最低。茎部磷和蛋白质含量在第7 ~ 10个WAS期间呈下降趋势，而茎部粗纤维含量在整个生育期均呈增加趋势，在第10个WAS之后增加幅度更大。茎部钙含量从第4周的0.3%增加到第13周的0.7%，叶片钙含量从第4周的0.25%增加到第10周的0.35%左右。茎部营养成分和组织硬化模式表明，在第7个WAS前后收获最佳，此时嫩芽占植株茎重的比例最大，约为61%，代谢产物如磷和蛋白质含量最多。尼日利亚园艺科学杂志Vol. 9 2005: 22-28

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Nigerian Journal of Horticultural Science

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