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Influence of the date of autumn harvesting on the quality of discharged waters

100%

Kolasa-Jaminska B.

Electronic Journal of Polish Agricultural Universities. Series Fisheries

2003

tom 06

nr 2

The rearing of carp K2-3 in polyculture with a grass- carp, silver carp and European catfish was carried out within 1995- 1997, in six (1995-1996) or in seven (in 1997) variants of ponds differed in stocking densities as well as in kind of feed fed. The objective of the present paper was to verify if the change of harvest date from September into November can affect the quality of discharged waters. Estimation of discharged water quality was made on the basis of following chemical factors: dissolved oxygen, water pH, total suspended matter, chemical oxygen demand CODMn, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen and phosphates. The change of harvest date for 40 days improved markedly the quality of discharged water.

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The effects of nitrogen fertilization on yielding and biological value of Chinese cabbage grown from seedlings for autumn harvest

80%

Krezel J., Kolota E.

Journal of Elementology

2008

tom 13

nr 2

In a field experiment conducted in 1999-2001 the effect of nitrogen nutrition on yield and biological value of cv. Optiko Chinese cabbage grown from transplants for autumn harvest was evaluated. Nitrogen was supplied in a single pre-plant dose in the amounts of 50, 100, 150, 200 kg⋅ha-1 or in a split application: 100+50 or 100+50+50 kg⋅ha-1, with top dressing conducted 2 and 4 weeks after planting. The results of the study did not show any significant response of Chinese cabbage yield to higher nitrogen rates. The level of nitrogen raised from 50 to 150 kg⋅ha-1 was favourable for vitamin C and total sugars content, while the application of 200 kg⋅ha-1 had a negative effect on accumulation of these constituents. Split application of 150 and 200 kg N⋅ha-1 resulted in decreased vitamin C and dry matter contents in comparison to single pre-plant doses of nitrogen used in the same amounts. Plant heavily supplied with nitrogen contained the highest level of nitrates.

Ograniczanie wyników

1 Electronic Journal of Polish Agricultural Universities. Series Fisheries

1 Journal of Elementology

1 Kolasa-Jaminska B.

1 Kolota E.

1 Krezel J.

1 2008

1 2003

Wyniki wyszukiwania

Influence of the date of autumn harvesting on the quality of discharged waters

The effects of nitrogen fertilization on yielding and biological value of Chinese cabbage grown from seedlings for autumn harvest