Minimal nitrogen and water use in horticulture: Effects on quality and content of selected nutrients

Stefanelli, D.; Goodwin, Ian; Jones, Renee

doi:10.1016/j.foodres.2010.04.022

Cited by 210 publications

(151 citation statements)

References 164 publications

(204 reference statements)

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“…The grass which is given nitrogen will have better production increase than without nitrogen. This agrees the research result of [13] that adequate N is an important need for the plant to grow and develop normally and also former of protein, structure and chloroplast function. Application of chicken manure of 60 ton ha-1 increased leaves number, leaves width, fresh weight and dried weight of plant [14].…”

Section: Resultssupporting

confidence: 93%

Chlorophyll, crop growth rate and forage yield of Brachiaria (Brachiaria brizantha Stapf) as the result of goat manure in various nitrogen dosage

Purbajanti¹,

Kusmiyati²,

Slamet³

et al. 2016

AIP Conference Proceedings

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Abstract. The research was done to find out theeffect of manure and N dosage on chlorophyll content, plant height, crop growth rate (CGR), forage yield, dry matter ((DM) yield and DM content of BrachiariabrizanthaStapf. The experiment used manure (0 and 5 ton/ha) and nitrogen dosage (50, 100, 150 kg N ha -1 ) set in factorial design 2 x 3, repeated three times. The result showed that manure increased chlorophyll content, plant height, CGR, forage yield, DM yield and DM content. N dosage increased chlorophyll content, plant height, CGR, forage yield, DM yield and DM content. The interaction between manure and N dosage increased chlorophyll content, plant height, CGR, forage yield, DM yield and DM content. The result showed that manure usage and nitrogen dosage 150 kg N ha -1 increased chlorophyll content, plant height, CGR, forage yield, DM yield and DM content in the amount of 27.5; 20.5; 98.4; 68.5; 103.4 and 20.5% compared to without manure and nitrogen dosage in the amount of 150 kg N ha -1 .

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Section: Resultssupporting

confidence: 93%

Chlorophyll, crop growth rate and forage yield of Brachiaria (Brachiaria brizantha Stapf) as the result of goat manure in various nitrogen dosage

Purbajanti¹,

Kusmiyati²,

Slamet³

et al. 2016

AIP Conference Proceedings

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“…Four day frequency x 120-60-30 NPK rate treatment produced higher EYR, AHI, SHI and YER which were correspondingly 29, 35, 60 and 90% higher than average across all the treatments. These results support work by Stefanelli et al [12] that moderate application rates of NPK fertilizer produces good vegetable yield characters, whereas high rates produces imbalances by promoting more vegetative components compromising other parts and low rate leads to poor quality and/or crop failure. Thus, intermediate irrigation and NPK applications can assist in improving the production of Cucumis africanus under greenhouse regimes.…”

Section: Discussionsupporting

confidence: 90%

Effect of irrigation frequency and NPK level on yield efficiency, resource use and harvest index of indigenous wild cucumberCucumis africanus

Nkgapele¹,

Mphosi²

2012

WIT Transactions on Ecology and the Environment

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In South African traditional medicine the roots, stems, leaves or fruit of wild cucumber, Cucumis africanus, are used as an emetic, purgative or enema for various ailments. The fresh young leaves are eaten as a pot herb by many rural people. A study was conducted to show the effects of irrigation frequency and NPK fertilizer application rate on leaf yield characters, harvest index and resource use efficiencies of C. africanus. The experiment was laid out in a splitplot design arrangement and replicated three times. Three irrigation frequencies, namely, 2, 4 and 6 days, were assigned as main plots and Nitrogen, Phosphorus and Potassium (NPK) application rates of 0 Kg NPK ha -1 , 60-40-20 kg NPK ha -1 , 120-80-40 kg NPK ha -1 and 180-120-60 kg NPK ha -1 were sub-plots. EYR, YER, AHI and SHI were significantly (P˂ 0.05) higher in the intermediate treatment of four day irrigation frequency and 120-80-60 kg NPK ha -1 , while WUE and NUE were pronounced in the six day irrigation frequency and 180-120-60 kg NPK ha -1 . WUE was significantly (P˂ 0.05) affected by both irrigation frequency and the interaction between irrigation frequency and NPK application rate, while NUE responded to NPK level only. Keywords: edible yield rate, yield efficiency rate, harvest index, water use efficiency.

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“…In tomato and lettuce, Stefanelli et al (2010) emphasized that the application of lower doses of N resulted in higher content of flavonoids. According to these authors, under the condition of N deficiency, the phenylalanine ammonia lyase (PAL) tends to increase its activity to meet the demand of N in the cell from phenylalanine, leading to a greater production of phenolic compounds, among them flavonoids.…”

Section: Discussionmentioning

confidence: 99%

“…Silva et al (2012) reported that the increase in the levels of N increased the content of N in chlorophyllousportions of pineapple leaves, also influencing the composition of this element in relation to other mineral nutrients. Therefore, since the photosynthetic efficiency is directly related to chlorophyll content, N availability can decisively influence the production capacity of plants (Taiz and Zeiger, 2008;Stefanelli et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Influence of combined sources of nitrogen fertilization on quality of cv. Vitria pineapple

Dantas¹,

Silva²,

Dantas³

et al. 2015

Afr. J. Agric. Res.

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Vitória pineapple besides surpassing cultivars traditionally consumed in Brazil, such as Pérola and Smooth Cayenne, exhibits resistance to Fusarium. In this sense, nitrogen fertilization is a critical factor because it interferes with the production and postharvest quality regardless of variety. Thus, this research aimed to evaluate the influence of doses and sources of nitrogen on the content of carbohydrates, bioactive compounds and antioxidant activity of Vitória pineapple cultivar. Five doses of N were tested in two sources: Organic (chicken manure) and mineral (urea) using a control with NPK. The lowest doses of N applied (2.62 and 4.50 g/plant) resulted in the contents of total soluble and nonreducing sugars different for the control.Without, the use of 152 g/plant chicken manure resulted in ascorbic acid accumulation. Lower doses of urea resulted in the highest yellow flavonoids, and when combined with chicken manure, it resulted in higher antioxidant activity and ascorbic acid content. Principal components analysis explained 64.7% of variability covering most of the variables analyzed, except for total antioxidant activity by the DPPH • method. All together, the use of chicken manure combined with urea was effective in improving the quality of Vitória pineapple at doses of up to 4.5 g N/plant.

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Minimal nitrogen and water use in horticulture: Effects on quality and content of selected nutrients

Cited by 210 publications

References 164 publications

Chlorophyll, crop growth rate and forage yield of Brachiaria (Brachiaria brizantha Stapf) as the result of goat manure in various nitrogen dosage

Chlorophyll, crop growth rate and forage yield of Brachiaria (Brachiaria brizantha Stapf) as the result of goat manure in various nitrogen dosage

Effect of irrigation frequency and NPK level on yield efficiency, resource use and harvest index of indigenous wild cucumberCucumis africanus

Influence of combined sources of nitrogen fertilization on quality of cv. Vitria pineapple

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