Collard green yield and nutritional quality with mineral and organic fertilization

Steiner, Fábio; Zuffo, Alan Mário; Echer, Márcia de Moraes; Guimarães, Vandeir Francisco

doi:10.5433/1679-0359.2019v40n5supl1p2165

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…The annual production of collard in Kenya is 413,599 MT valued at KES 5.9 billion [1]. Collard is rich in dietary fiber, vitamins C, E, K and minerals such as magnesium, iron, and calcium [3]. Collard is harvested from 45-60 days after transplanting and can last 4-5 months in the field depending on the variety and environmental conditions [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of harvest stage and nitrogen fertilization on the postharvest shelf life of black nightshade (Solanum nigrum L.) and collard (Brassica oleracea var. acephala L.)

Gitau¹,

Ambuko²,

Chemining’wa³

et al. 2022

AJFAND

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Leafy vegetables play a crucial role in the human diet providing numerous nutrients and health benefiting compounds. Leafy vegetables like collard (Brassica oleracea var. acephala) and black nightshade (Solanum nigrum l.) are commonly consumed leafy vegetables in Kenya. However, their high perishability and short shelf life (usually 1-2 days at ambient temperature) limits their utilization resulting in significant high postharvest losses. This study assessed the effect of harvest stage and nitrogen fertilization on the postharvest shelf life of collard and black nightshade. Experiments were conducted at Kabete field station, University of Nairobi, using collard and black nightshade. Field experimental layout was a 4 x 3 factorial arrangement in randomized complete block design with three replicates. Factors were nitrogen levels and harvest stage. Four levels of nitrogen (0, 30, 60 and 90 kg N/ha) were applied on black nightshade and (0, 55.5, 111.1 and 166.6 kg N/ha) in collard where 0 kg N/ha was the control. Collard and black night shade were harvested at three harvest stages: 4 weeks, 6 weeks and 8 weeks after transplanting. The harvested vegetables were kept at ambient room condition (20 ºC, 55% relative humidity). Data collection was performed daily for quality related parameters which included color change, wilting index and cumulative weight loss. Results show that there was a progressive deterioration in quality of the collard and black nightshade with storage time regardless of harvest stage and nitrogen level. Harvesting at 8 weeks after transplanting resulted in longer shelf life in collard (three days) and black nightshade (two days) when compared to harvesting at 4 weeks or 6 weeks after transplanting. Collard and black nightshade showed reduced hue angles over storage time at different harvest stages. Black nightshade subjected to 90 kg N/ha and harvested at 4 weeks after transplanting had the highest wilting index of 33%. The highest cumulative weight loss of 29% was recorded in collard that were harvested at 8 weeks after transplanting. Black nightshade subjected to 90 kg N/ha and harvested at 6 weeks after transplanting showed the best color at a hue angle of 145°. Overall, harvesting at 8 weeks after transplanting resulted in the longest shelf life of both black nightshade and collard. These results show that low application of nitrogen fertilizer in black nightshade (30 kg N/ha) and in collard (55.5 kg N/ha) had minimal effects on weight loss and wilting and resulted in good keeping quality. Key words: Black nightshade, Collard, Harvest Stage, Nitrogen nutrition, Shelf life

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Section: Introductionmentioning

confidence: 99%

Effect of harvest stage and nitrogen fertilization on the postharvest shelf life of black nightshade (Solanum nigrum L.) and collard (Brassica oleracea var. acephala L.)

Gitau¹,

Ambuko²,

Chemining’wa³

et al. 2022

AJFAND

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Organic fertilizers diminish two important pests on collard green compared to synthetic fertilizer

Sousa,

Ursi-Ventura,

Teruhiko-Hata

et al. 2024

Remexca

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Plant fertilization may impact directly on insect pest behavior and biology. Fertilization may be accomplished by using synthetic mineral or organic fertilizers. The effect of different doses of boiled hen chicken manure, Penergetic®, Bokashi compound and mineral fertilizer on the adult population of Bemisia tabaci and Myzus persicae on collards leaves were evaluated. The experiment was conducted in the greenhouse using the treatments: Bokashi, Penergetic® bioactivator, 2.5%, 5%, and 7.5% of solution of boiled manure, mineral fertilization and control. The number of insects was counted directly on the leaves, and the nitrogen, potassium content, and total phenolic compound in the leaves were determined. Higher populations of Bemisia tabaci and M. persicae were observed on NPK-fertilized plants compared to other treatments. Higher levels of nitrogen foliar were found for Bokashi-fertilized plants; and higher concentrations of total phenolic compounds were found in the control. A negative correlation between total phenolics and B. tabaci was established suggesting the importance of these compounds in the species development. The results indicate the importance of the source of the fertilization for sustainable pest management.

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Shoot Production and Metabolite Content of Cosmos sulphureus Cav. Leaves with Different Rates of Goat Manure

Saleh,

Arifin Aziz,

Melati

et al. 2024

JTAS

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Cosmos sulphureus Cav. is a plant species commonly cultivated for ornamental purposes, with its young leaves being consumed as vegetables. Therefore, this study aimed to investigate the effect of goat manure rates and different harvest criteria on shoot production as well as the metabolite of C. sulphureus. The experiment was conducted in Kuningan Regency, West Java, Indonesia, from October to November 2022, using a factorial randomized complete block design. Goat manure rates examined were 0, 100, 200, and 300 kg N/ha, equivalent to 0, 6, 12, and 18 tons of goat manure/ha. Shoot harvest criteria were two and four top nodes, with each treatment replicated three times. The result showed that applying goat manure significantly increased the shoot production of C. sulphureus. The harvest criteria affected the shoot weight per plant, where the four-node harvest was 98.3% higher than the two-node. The metabolite content, such as crude fiber, phenolic, and antioxidant activity, was not significantly different between the upper and lower leaves. However, the lower leaves had a total flavonoid and sugar content of 38.9 and 12.6%, higher than the upper leaves.

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Collard green yield and nutritional quality with mineral and organic fertilization

Cited by 3 publications

References 15 publications

Effect of harvest stage and nitrogen fertilization on the postharvest shelf life of black nightshade (Solanum nigrum L.) and collard (Brassica oleracea var. acephala L.)

Effect of harvest stage and nitrogen fertilization on the postharvest shelf life of black nightshade (Solanum nigrum L.) and collard (Brassica oleracea var. acephala L.)

Organic fertilizers diminish two important pests on collard green compared to synthetic fertilizer

Shoot Production and Metabolite Content of <i>Cosmos sulphureus</i> Cav. Leaves with Different Rates of Goat Manure

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