The influence of different nitrogen and potassium fertilisation on the chemical flavour composition of kohlrabi (<i>Brassica oleracea</i> var <i>gongylodes</i> L)

Fischer, Jörgen

doi:10.1002/jsfa.2740600410

Cited by 18 publications

(19 citation statements)

References 10 publications

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“…The maximum dry weight of knob (11.55%) was recorded from the K 3 (80 kg K ha -1 ) while the minimum dry weight of knob (9.46%) was found from K 0 (control) treatment (Table 1). Fischer (1992) found similar results in kohlrabi. The maximum marketable yield per plot (6.18 kg) was observed from the K 3 (80 kg K ha -1 ) treatment while the minimum marketable yield per plot (4.63 kg) was found from K 0 (control) treatment (Table 1).…”

Section: Effects Of Potassiumsupporting

confidence: 77%

Effects of cowdung and potassium on growth and yield of Kohlrabi

Sultana¹,

Siddique²,

Rashid³

2012

J Bangladesh Agric Univ

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An experiment was carried out at the Horticulture Farm of the Bangladesh Agricultural University, Mymensingh during the period from November 2010 to January 2011 to study the effects of cowdung and potassium on growth and yield of Kohlrabi. The experiment consisted of three levels of cowdung (0, 20 and 40 t/ha) and four levels of potassium (0, 20, 50, 80 kg /ha). The experiment was laid out in randomized complete block design with three replications. All the parameters were significantly influenced by application of cowdung and potassium. The highest plant height (44.65 cm), number of leaves per plant (12.11), length of largest leaf (37.54 cm), and breadth of largest leaf (18.66 cm) were obtained from the highest dose of cowdung and potassium applied (40 t cowdung + 80 kg K/ha) while the lowest plant height (33.64 cm), number of leaves (9.01), length of largest leaf (27.94 cm), and breadth of largest leaf (11.00 cm) were obtained from control treatment combination. The highest fresh weight of leaves (49.33 g), fresh weight of knob (328.66 g) and fresh weight of roots (66.55 g) per plant were also recorded under the treatment combination of 40 t cowdung + 80 kg K/ha, while the lowest fresh weight of leaves (22.11 g), fresh weight of knob (136.00 g) and fresh weight of roots (23.33 g) were obtained from control treatment combination. Similarly, the dry weight of leaves (19.34%), knob (15.19%) and roots (32.75%) were highest under the same treatment combination of 40 t cowdung + 80 kg K/ha and the lowest dry weight of leaves (11.71%), dry weight of knob (7.38%) and dry weight of roots (15.29%) were obtained from control treatment combination C 0 K 0 . The marketable yields of knob per plot (7.86 kg) and per hectare (39.58 tons) were also the highest under the treatment combination 40 t cowdung/ha and 80 kg potassium per hectare.

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Section: Effects Of Potassiumsupporting

confidence: 77%

Effects of cowdung and potassium on growth and yield of Kohlrabi

Sultana¹,

Siddique²,

Rashid³

2012

J Bangladesh Agric Univ

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“…Hsu et al (2009) also found an increase in a single glucosinolate (sinigrin) in Brassica grown in pots with an organic soybean meal treatment compared with those in synthetic fertilizer. Brassica glucosinolate concentrations often decrease in response to increasing fertilizer or nitrogen supply (Fischer 1992;Chen et al 2004;Aires et al 2006;Schonhof et al 2007), but, with the exception of glucoiberin, we found no effect of fertilizer quantity on glucosinolate concentration. The differences in glucosinolate concentration found in the current study were probably constitutive rather than induced (Siemens & Mitchell-Olds 1998), as the dominant chewing herbivore (P. xylostella) was more abundant on the conventional plants, which had a lower concentration of glucosinolates.…”

Section: Discussioncontrasting

confidence: 55%

Varying responses of insect herbivores to altered plant chemistry under organic and conventional treatments

et al. 2009

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The hypothesis that plants supplied with organic fertilizers are better defended against insect herbivores than those supplied with synthetic fertilizers was tested over two field seasons. Organic and synthetic fertilizer treatments at two nitrogen concentrations were supplied to Brassica plants, and their effects on the abundance of herbivore species and plant chemistry were assessed. The organic treatments also differed in fertilizer type: a green manure was used for the low-nitrogen treatment, while the highnitrogen treatment contained green and animal manures. Two aphid species showed different responses to fertilizers: the Brassica specialist Brevicoryne brassicae was more abundant on organically fertilized plants, while the generalist Myzus persicae had higher populations on synthetically fertilized plants. The diamondback moth Plutella xylostella (a crucifer specialist) was more abundant on synthetically fertilized plants and preferred to oviposit on these plants. Glucosinolate concentrations were up to three times greater on plants grown in the organic treatments, while foliar nitrogen was maximized on plants under the higher of the synthetic fertilizer treatments. The varying response of herbivore species to these strong differences in plant chemistry demonstrates that hypotheses on defence in organically grown crops have over-simplified the response of phytophagous insects.

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“…Probably, the increase in plant growth and N uptake in presence of the soil organisms affected the concentration of this secondary metabolite. Both positive (Gustine and Jung 1985;Werteker 1991;Hugentobler and Renwick 1995) and negative correlations (Wolfson 1982;Fischer 1992) between nitrogen availability and glucosinolate concentration have been documented. The second sulphur containing glucosinolate, glucoraphanin, was affected by an interaction between earthworms and nematodes.…”

Section: Discussionmentioning

confidence: 99%

Effects of belowground biota on primary and secondary metabolites in Brassica oleracea

et al. 2006

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Soil organisms in direct and indirect interaction with plant roots affect aboveground herbivores, likely by inducing different plant responses. We investigated the combined effects of the root-knot nematode Meloidogyne incognita (in direct interaction with roots) and the endogeic earthworm Octolasion tyrtaeum (in indirect interaction with roots) on the performance of Brassica oleracea. Both earthworms and nematodes increased N uptake and shoot biomass of B. oleracea. Earthworm activity mobilized more soil N than litter N, and herbivory by nematodes tended to increase the microbial biomass in soil. Only the structural class of sulphur containing glucosinolates was affected by the soil organisms. Earthworms decreased glucoiberin concentrations in B. oleracea shoots. Glucoraphanin was affected by an interaction between earthworms and nematodes.

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The influence of different nitrogen and potassium fertilisation on the chemical flavour composition of kohlrabi (Brassica oleracea var gongylodes L)

Cited by 18 publications

References 10 publications

Effects of cowdung and potassium on growth and yield of Kohlrabi

Effects of cowdung and potassium on growth and yield of Kohlrabi

Varying responses of insect herbivores to altered plant chemistry under organic and conventional treatments

Effects of belowground biota on primary and secondary metabolites in Brassica oleracea

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