Wyniki wyszukiwania - AGRO

1

Kinetics of nitrogen and inorganic phosphate in a double layer system micropropagated Rosa multiflora

100%

Borkowska B., De Riek J., Debergh P. C.

Acta Physiologiae Plantarum

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1997

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tom 19

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nr 2

2

Nitrate reductase activity in fragments of main shoot of rye [Secale cereale L.]

100%

Wojcieska U., Wolska E., Giza A.

Acta Physiologiae Plantarum

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1992

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tom 14

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nr 2

3

Free base and metalloporphyrin radicals

100%

Manikowski H., Kubaszewski E., Lozynski M., Wroblewski M.

Current Topics in Biophysics

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1994

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tom 18

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nr 2

4

Soil mineral nitrogen testing in Lithuania

88%

Staugaitis G., Mazvila J., Vaisvila Z., Arbaciauskas J., Putelis L., Adomaitis T.

Nawozy i Nawożenie

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2009

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nr 37

5

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Counts and activity of microorganisms participating in nitrogen transformations in soil, four years after application of sewage sludge

88%

Joniec J., Furczak J.

Journal of Elementology

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2008

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tom 13

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nr 4

545-557

The objective of the study was to determine the direction, intensity and duration of changes in abundance and activity of certain microbial groups active in nitrogen transformations in soil subjected to a 4-year fertilization treatment with municipal and industrial sewage sludge. The study was conducted on podzolic soil, whose accumulation horizon had been fertilized in 1998 with fermented sewage sludge at doses of 30 Mg⋅ha-1(1%), 75 Mg⋅ha-1(2.5%), 150 Mg⋅ha-1(5%), 300 Mg⋅ha-1(10%) and 600 Mg⋅ha-1(20%) and planted with willow (Salix viminalis L.). Four years after the application of sludge, microbiological and biochemical analyses were made in two soil horizons (0-20 cm and 20-40 cm). It was found that in the soil from the 0-20 cm depth significant stimulation of the growth of proteolytic fungi and bacteria continued, but only under the effect of the highest dose of sludge. Moreover, there was a notable stimulation of protease activity and nitrification process alongside a slight inhibition of ammonification. In the soil from the 20-40 cm layer stimulation of the growth of protein-decomposing fungi was observed as well as that of proteolytic and nitrification activity of soil, while ammonification was inhibited. However, the effect of sludge was generally less pronounced in the deeper soil layer than in the surface soil horizon.

6

Management of nitrogen inputs on farm within the EU regulatory framework

88%

ten Berge H. F. M., van Dijk W.

Nawozy i Nawożenie

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2009

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nr 37

7

Effect of nitrogen fertilization on growth and development of Pelargonium X hortorum. I. Effect of different N levels

88%

Lis-Krzyscin A.

Folia Horticulturae

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1999

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tom 11

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nr 1

8

Studies on N-metabolism in different gastrointestinal sections of sheep using the digesta exchange technique. 1. Model and experimental conditions

88%

Sandek A., Krawielitzki K., Kowalczyk J., Kreienbring F., Gabel M., Zebrowska T., Voigt J.

Journal of Animal and Feed Sciences

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2001

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tom 10

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nr 3

9

External input to Lake Wadag - effective and estimate loadings

88%

Lossow K., Gawronska H.

Polish Journal of Environmental Studies

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1998

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tom 07

|

nr 2

Comparison was made of effective and estimated loads of phosphorus and nitrogen coming from the catchment area to Lake Wadąg. It was concluded that the effective loads of phosphorus based on direct measurements were much similar to values obtained from the estimation method covering only diffused pollution sources. This seems to point out that external loads to lakes calculated as unit run-off of nutrients from dispersed, non-point (diffused) and point sources are too high (at least in the conditions of Pojezierze Olsztyńskie). Big discrepancies in run-off regarding effective nitrogen loads imply that the estimated values should be treated rather critically.

10

Preliminary results of calculations for a global model describing pulsed microwave discharge plasma in nitrogen

88%

Stanco J., Nowakowska H., Zakrzewski Z.

Acta Agrophysica

|

2002

|

tom 80

11

Changes in nitrate content of red beet with growing time

88%

Grzebelus D.

Folia Horticulturae

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1995

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tom 07

|

nr 2

12

Nutrient losses from manure after application

76%

Shepherd M.

Nawozy i Nawożenie

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2001

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tom 03

|

nr 1[06]

13

The effect of mineral fertilization [NPK] on the concentration of mineral forms of nitrogen in a meadow soil

76%

Wiater J., Kozera P., Niczyporuk A.

Annals of Warsaw Agricultural University. Agriculture

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2001

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nr 39

41-49

14

Steady-state and dynamic photosynthetic performance and nitrogen partitioning in the shade-demanding plant Panax notoginseng under different levels of growth irradiance

76%

Chen J.-W., Kuang S.-B., Long G.-Q., Meng Z.-G., Li L.-G., Chen Z.-J., Zhang G.-H., Yang S.-C.

Acta Physiologiae Plantarum

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2014

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tom 36

|

nr 09

In this study, we examined steady-state and dynamic photosynthetic performance and leaf nitrogen (N) partitioning in the typical shade-demanding herb Panax notoginseng grown along a light gradient. Gas exchange on a leaf area basis was significantly reduced under low irradiance, with gas exchange on a leaf mass basis reaching a maximum value and then decreasing along the light gradient. Specific leaf area significantly increased with decreasing irradiance levels (P<0.001), whereas carboxylation efficiency was decreased (P<0.001). In addition, decreasing growth irradiance levels led to declines in maximum carboxylation rate (Vcmax) and maximum electron transport rate (Jmax), although Vcmax/ mass and Jmax/mass were relatively less affected than Vcmax/area and Jmax/area. Slow photosynthetic response to simulated sunflecks was observed under low levels of growth irradiance, with stomatal limitations only detected in leaves grown under low-light conditions. Chlorophyll content increased significantly with decreasing irradiance levels. N content on a leaf mass basis apparently increased, while N content on a leaf area basis markedly decreased. The fraction of leaf N allocated to light-harvesting components increased significantly with decreasing growth irradiance levels, whereas the fraction allocated to carboxylation and bioenergetics was significantly reduced. As an adaptation strategy to growth irradiance, we conclude that adjustments in specific leaf area may be more important than changes in leaf physiology and biochemistry in typical shade-demanding species such as P. notoginseng.

15

Standard figures for manure composition and N-manure equivalents

76%

Klir J., Cermak P.

Nawozy i Nawożenie

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2001

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tom 03

|

nr 1[06]

16

Concentration of nutrients in the soil in water-level-fluctuating zone of Three Gorges Reservoir

76%

Zhang B., Guo J.-S., Fang F., Li Z., Fu C.

International Journal of Ecohydrology and Hydrobiology

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2012

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tom 12

|

nr 2

17

The influence of liming and mineral fertilization on the utilization of nitrogen by spring barley

76%

Bednarek W., Reszka R.

Annales Universitatis Mariae Curie-Skłodowska. Sectio E. Agricultura

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2009

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tom 64

|

nr 3

18

Validation of the model Macrobil with respect to manure composition

76%

Klir J., Kunzova E., Cermak P.

Nawozy i Nawożenie

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2001

|

tom 03

|

nr 2[07]

19

Evaluation of canola chlorophyll index and leaf nitrogen under wide range of soil moisture

76%

Meskini-Vishkaee F., Mohammadi M. H., Neyshabouri M. R., Shekari F.

International Agrophysics

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2015

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tom 29

|

nr 1

The paper presents a study on the effect of soil matric suction on the variation of leaf chlorophyll index and nitrogen concentration of canola. Results showed that chlorophyll index increases exponentially with soil matric suction, especially at the late season of canola growing time. At moderate matric suction (200 and 300 kPa soil suction heads), chlorophyll index remains nearly constant, but in drier soil (matric suction >300 kPa),chlorophyll index increases gradually with time. Despite the va-riation of the total leaf nitrogen with the soil matric suction, it is similar to the variation of the chlorophyll index, but the results showed that the chlorophyll index – nitrogen concentration curve has a de-marcated bi-modal shape. We suggest that 2.7% of nitrogen and 69.8 of the chlorophyll index value represent the upper limit of the chlorophyll meter reliability for estimation of canola nitrogen under a wide range of soil moisture levels. These results confirm that the chlorophyll meter can be used as an effective tool for rapid and non-destructive estimation of the relative chlorophyll and nitrogen content in canola leaves at a wide range of soil moisture content, except for nearly wilting coefficient or extremely high drought stress.

20

Starter fertilization of maize as a method to improve the efficiency of nutrient application

76%

Szulc P.

Polish Journal of Natural Sciences

|

2017

|

tom 32

|

nr 4

Phosphorus (P) in most regions worldwide is the most important nutrient, second only to nitrogen (N), with the potential to limit agricultural production. It is an essential nutrient for plant growth and development, while the cycle of this nutrient in nature is also essential for humans and animals. In plants it is a component of organic compounds, which accumulate large amounts of energy used in numerous processes taking place in cells. Plants adequately nourished with phosphorus contain more vitamins and carotene, and less oxalic acid, which excess results in deterioration of quality of produced food and feed. At appropriate phosphorus nutrition plants achieve greater efficiency of photosynthesis and are characterized by improved water relations, as a consequence they produce higher grain yields and dry matter yields of the aboveground parts. This study presents original results of five field trails concerning different application methods for nutrients (N and P) in maize culture. Presented data come from controlled field trials, which were conducted at the Department of Agronomy, the Poznań University of Life Sciences.

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