Wyniki wyszukiwania - AGRO

1

The content of nitrate[V] in potato tubers storage in temperature 4 degrees Celsius

100%

Wichrowska D.

Polish Journal of Natural Sciences. Supplement

|

2007

|

tom 04

121-127

2

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Effect of nitrogen fertilization on yield, NH4plus and NO3- content of white cabbage

100%

Sady W., Rozek S., Domagala-Swiatkiewicz I., Wojciechowska R., Kolton A.

Acta Scientiarum Polonorum. Hortorum Cultus

|

2008

|

tom 07

|

nr 2

The results of three year investigations with ‘Galaxy’ F1 cabbage grown under field conditions are presented. The effect of the rate of ammonium sulphate and RSM (solution of ammonium nitrate + urea), the method of application (placement and broadcast technique) and foliar fertilization (urea and Supervit K) on the yield and nitrate accumulation was studied. The form of N fertilizer significantly increased the cabbage yield only in 2007. In this year the better nitrogen source was ammonium sulphate in comparison with RSM. In the other years no differences between the kind of N fertilizer were observed. The method of application did not affect cabbage yield any year. However, slightly better cropping was noted for following treatments 75% N broadcasted at planting + 25% N during growth season, 75% N broadcasted at planting + foliar fertilization, and after placement fertilization with reduced rate (75% N) as compared to control (100% N broadcasted at planting), in every year of the experiment. In 2006 and 2007 fertilization at the rate of 75% N and supplemented with addition 25% N during the growth or foliar sprays significantly increased nitrate content in cabbage as compared to control treatment.

3

Changes in nitrate content of red beet caused by different methods of nitrogen fertilization

100%

Grzebelus D.

Folia Horticulturae

|

1995

|

tom 07

|

nr 2

4

Usefulness of three extraction solvents for the determination of nitrates content in vegetables

100%

Kozik E., Przybyla T., Golcz A.

Roczniki Akademii Rolniczej w Poznaniu. Ogrodnictwo

|

2002

|

tom 35

5

Changes in nitrate content of red beet with growing time

100%

Grzebelus D.

Folia Horticulturae

|

1995

|

tom 07

|

nr 2

6

The effect of cultivation season and selected sorbents on the yield and nitrate content of butterhead lettuce [Lactuca sativa L. var. capitata L.]

86%

Majkowska-Gadomska J., Wierzbicka B.

Polish Journal of Natural Sciences

|

2005

|

tom 18

15-24

7

Changes of nitrate and cadmium content in carrots as related to soil and climatic factors

86%

Sady W., Grys R., Rozek S.

Folia Horticulturae

|

1999

|

tom 11

|

nr 2

8

Azotany [V] w produktach rolniczych w swietle badan monitoringowych prowadzonych na Dolnym Slasku

72%

Kucharzewski A., Nowak L., Chylinska E.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

2006

|

tom 515

219-225

W opracowaniu przedstawiono wyniki badań monitoringowych z lat 1997 - 2002 nad zawartością azotanów(V) w produktach rolniczych z województwa dolnośląskiego. Badaniami objęto najbardziej popularne gatunki warzyw (marchew, pietruszkę, ogórki, kalafiory, selery, pomidory, sałatę, rzodkiewkę, buraki ćwikłowe, kapustę białą, szpinak) oraz ziemniaki, a więc te produkty, które są głównym źródłem azotanów dla organizmu człowieka. Stwierdzono zróżnicowany poziom zawartości azotanów i znaczną rozpiętość wyników w obrębie analizowanych gatunków warzyw. W oparciu o obowiązujące w Polsce akty prawne wykazano, że blisko 17% badanych produktów nie spełnia wymagań jakościowych pod kątem zawartości azotanów. Potwierdzono tendencję kumulacji azotanów w warzywach korzeniowych (rzodkiewka i burak ćwikłowy) i 70-100% przekroczenia limitów NDZ azotanów w kalafiorach i kapuście. Jednocześnie wskazano na stosunkowo niskie zawartości azotanów w ogórkach i pomidorach oraz warzywach liściowych (szpinak, sałata). W gatunkach roślin powszechnie spożywanych przekroczenia dopuszczalnej zawartości azotanów odnosiły się do 1,2% próbek ziemniaków i około 12% próbek marchwi. Wskazano na potrzebę kontroli poziomu zawartości azotanów w produktach rolniczych będących w obrocie handlowym i kontynuację tego typu badań.

9

Water type quantification in the Skagerrak, the Kattegat and off the Jutland West coast

72%

Kristiansen T., Aas E.

Oceanologia

|

2015

|

tom 57

|

nr 2

10

Okreslenie 'natywnych' zawartosci azotanow [V] w glebach uprawnych Polski

72%

Stepniewska Z., Szmagara A., Ostrowski J.

Acta Agrophysica

|

2003

|

tom 84

129-136

11

Oznaczanie azotanow w owocach i warzywach w Laboratorium ODR Boguchwala

72%

Szalacha E.

Biuletyn Informacyjno-Handlowy. Ośrodek Doradztwa Rolniczego Boguchwała

|

1997

|

nr 11

7

12

Zawartosc azotanow[V] i azotanow[III] w roslinach straczkowych

72%

Malinowska E., Gromkowska A., Szefer P.

Bromatologia i Chemia Toksykologiczna

|

2007

|

tom 40

|

nr 3

287-291

Oznaczono zawartość azotanów(V) i azotanów(III) w suchych nasionach roślin strączkowych, świeżych strąkach fasoli szparagowej, produktach konserwowych oraz mrożonkach zakupionych w handlu detalicznym na terenie Trójmiasta. Dokonano porównania oznaczonych stężeń z aktualnie obowiązującym ustawodawstwem oraz oceniono pobranie tych związków z analizowanymi produktami.

13

Wystepowanie azotanow w owocach i warzywach - wyniki badan laboratorium WODR Boguchwala

72%

Szalacha E.

Biuletyn Informacyjno-Handlowy. Ośrodek Doradztwa Rolniczego Boguchwała

|

2000

|

nr 11

19

14

Nitrates and nitrites in selected vegetables purchased at supermarkets in Siedlce, Poland

72%

Raczuk J., Wadas W., Glozak K.

Roczniki Państwowego Zakładu Higieny

|

2014

|

tom 65

|

nr 1

Background. Vegetables constitute a vital part of the human diet, being the main source of minerals, vitamins, dietary fibre and phytochemicals. They however, also contain nitrates and nitrites, which adversely affect human health. Objective. To determine nitrate and nitrite content in selected vegetables purchased at supermarket chains in Siedlce and to assess their impact on consumer health. Material and methods. Vegetable samples were purchased from local supermarkets in Siedlce, town situated in the Mazovian province (Voivodeship) of Poland. These consisted of 116 samples of nine vegetables types including butterhead and iceberg lettuce, beetroot, white cabbage, carrot, cucumber, radish, tomato and potato collected between April and September 2011. Concentrations of nitrate and nitrite were determined by standard colorimetric methods used in Poland, with results expressed as mg per kg fresh weight of vegetables. Results. Nitrate concentrations varied between 10 mg∙kg-1 to 4800 mg∙kg-1. The highest mean nitrate concentrations were found in radishes (2132 mg∙kg-1), butterhead lettuce (1725 mg∙kg-1), beetroots (1306 mg∙kg-1) and iceberg lettuce (890 mg∙kg-1), whereas the lowest were found in cucumber (32 mg∙kg-1) and tomato (35 mg∙kg-1). Nitrite levels were also variable; the highest concentrations measured were in beetroot (mean 9.19 mg∙kg-1) whilst much smaller amounts were present in carrot, cucumbers, iceberg lettuce, white cabbage, tomatoes and potatoes. The daily adult consumption of 100 g amounts of the studied vegetables were found not exceed the ADI for both nitrates and nitrites. Conclusions. Findings indicated the need for monitoring nitrate and nitrite content in radishes, butterhead lettuce and beetroot due to consumer health concerns.

15

The content of nitrate in herbage of some spice plants depending on light conditions and temperature

72%

Fraszczak B., Knaflewski M., Ziombra M.

Roczniki Akademii Rolniczej w Poznaniu. Ogrodnictwo

|

2006

|

tom 40

16

Effect of differentiated nitrogen fertilization on nitrate content, nitrate and nitrite reductase activity in winter white cabbage during long-term storage

72%

Wojciechowska R., Rozek S., Leja M., Rydz A.

Folia Horticulturae

|

2000

|

tom 12

|

nr 1

17

Comparison among soil tillage methods in Southern Italy: effects on agronomical responses and soil properties

72%

Convertini G., De Giorgio D., Ferri D., Giglio L., La Cava P.

Bibliotheca Fragmenta Agronomica

|

1997

|

tom 2A

18

A contribution to the assessment of potential denitrification in arable mineral soils of Poland

72%

Glinski J., Stepniewska Z., Stepniewski W., Ostrowski J., Szmagara A.

Journal of Water and Land Development

|

2000

|

nr 04

The main mechanism responsible for N20 production in agroecosystems is denitrification of nitrates (V) under hypoxic conditions, which occur e.g., after intensive precipitation or at high ground water level. The calculations of potential denitrification were performed for surface horizons from 672 soil profiles representing 25 main soil units of Polish soils. A proposal of the assessment of potential denitrification rate on the basis of the nitrate content, humus horizon thickness, its bulk density and of previously investigated soil redox resistance in the form of indicators tm and tm is presented. The proposal is based on the assumption that denitrification is linear with time and is illustrated for the temperature of 20°C. It was shown, that the highest potential denitrification would occur in Rendzic Leptosols and in the soils developed from loess i.e. Phaeozem, Cambisol and Luvisol, while the lowest <5 kg ha-1d-1 N - in Luvisols developed from loose sands, loams and skeleton loams. Evaluation of spatial distribution of the potential denitrification rate at current nitrate content in mineral soils of Poland has been attempted in the form of a map.

19

Properties of nitrate reductase from seedling leaves of selected barley genotypes

72%

Gniazdowska-Skoczek H.

Acta Physiologiae Plantarum

|

1997

|

tom 19

|

nr 2

Crude extracts from leaves of 6-day barley seedlings of parental genotypes (cv. Aramir and primitive line R567) and selected doubled haploid (DH) lines were not found to have significant differences in the NADH:NR activity, while considerable differences between these genotypes were shown by the NAD(P)H:NR activity. The cv. Aramir and DH lines did not differ by nitrate accumulation in the leaves. However, the primitive line R567, as compared to the remaining genotypes, was characterized by an appreciably lower ability to accumulate nitrates. In partially purified leaf extracts, significant differences in total NADH:NR activity and in distal activity dependent on methyl viologen (MV:NR) were found between the parental genotypes and selected DH lines. The studied genotypes differed also in dehydrogenase NR activity, i.e. cytochrome c reductase activity in crude extracts. In the studied genotypes, the NADH:NR activity in partially purified leaf extracts did not substantially differ by Km values for nitrates. Calculated Vmax values for NADH:NR in these genotypes were similar to total NR activity in partially purified extracts. Significant differences between the parental genotypes and selected DH lines were found in the thermal NADH:NR stability in crude and partially purified leaf extracts. From the performed studies it follows that different NR stability was one of the reasons of revealed differences in total activity and in partial NR activities in the leaf extracts between the studied genotypes of spring barley. Besides, it is suggested that varied NR gene expression in the leaves of these barley genotypes could also influence NR activity.

20

Porownanie dzialania dwoch nawozow wieloskladnikowych na plon i zawartosc azotanow [V] w owocach pomidora

58%

Mazur Z., Tomaszewska Z.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

2006

|

tom 513

259-263

W latach 2005 przeprowadzono doświadczenie wazonowe, w którym badano wpływ nawożenia dwoma nawozami wieloskładnikowymi (Polifoską 5 i Polimagiem S) na plon owoców pomidora i zawartość w nich azotanów(V). Dawki nawozów odpowiadały 0,5; 1,0; 1,5 i 2,0 g N na wazon. Nawożenie Polifoską 5 i Polimgiem S spowodowało zwiększenie plonu owoców pomidora odpowiednio o 196% i 129% w stosunku do obiektu kontrolnego i korzystnie wpłynęło na zawartość suchej masy w owocach pomidora, co wyrażało się większym relatywnym jej wzrostem niż plon świeżej masy. Zawartość azotanów(V) tak w suchej jak i świeżej masie owoców pomidora była większa w obiektach nawożonych Polifoską 5.

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