Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: fertilization regime

Sortuj według:

Ogranicz wyniki do:

Evaluation of different potato fertilization regimes on starch yield - production and economic aspects

100%

Winnicki T., Bogucka B.

Polish Journal of Natural Sciences

2017

tom 32

nr 4

The article contains data concerning the production and economic aspects of producing starch from three starch potato cultivars, such as Adam, Pasja Pomorska and Ślęza. The considerations are based on an experiment conducted in 2008–2010 at the Experimental Station of the University of Warmia and Mazury in Olsztyn, situated in Bałcyny (N = 53°35’49’’; E = 19°51’20,3’’). The study has shown that the cultivar Adam is the least economically useful starch potato, as it gives low starch yields, generates very high unit costs and presents the least favourable response to modifications in foliar fertilization that do not lead to the improvement of yielding. The lowest unit costs of producing starch occurred in the production of the potato cultivar Ślęza. Depending on the applied foliar fertilization treatments, the starch production unit costs decreased the most for the cultivar Pasja Pomorska, reaching the highest cost reduction level in the variant consisting of soil dressing A – 280 kg ha⁻¹ NPK (80 N, 80 P, 120 K) and foliar fertilization variant a – Basfoliar 12-4-6 [8 dm ha⁻¹].

Nitrous oxide emission from grassland in different management conditions [fertilization regimes]

67%

Burczyk P., Oenema O., Kuikmann P., Velthof G.

Journal of Water and Land Development

2001

nr 05

The application of large amounts of organic or mineral nitrogen (N) fertilizers to soil may cause high risk of nitrogen (N) losses to air and groundwater. A field experiment on regularly cut (5-6 times per year) grassland located on sandy soil was established to evaluate the effect of different fertilization regimes (control without fertilizer, calcium ammonium nitrate (CAN 100), CAN 50/50 in a split dose, ammonium sulphate (SACAM), cattle slurry in 3 doses (SLUR 20/20/20) of 20 tons of cattle slurry in 2 doses (SLUR 30/30) of 30 tons of manure with additional CAN to equal amounts of N added with mineral fertilizer only) on nitrogen losses via N20 production and emission and N03- leaching to deeper soil layers. For better evaluation of used practices (various N fertilization regimes) nitrogen balances for fields have been estimated. Highest fluxes of N20 were found on fields where slurry was applied. Application of slurry in three doses instead of two decreased emissions. Peak fluxes were found two weeks after application (145 μg m-2 h -1 N), and remained so for at least one month. A second fertilization caused another higher peak on the same fields (205 μg-m2-h-1 N). Mineral fertilization caused lower N20 emissions than slurry: Calcium ammonium nitrate used in one dose caused highest fluxes for mineral fertilizers with a peak also two weeks after application (70 μg m-2 h-1 N). On plots where CAN was divided into two rates, fluxes were lower and similar to plots where ammonium sulphate was applied. Generally, fluxes observed in this experiment were low. This could be attributed to a relatively low mineral N content in soil at the beginning of the growth period. Accumulated losses of N20 during the vegetation period until the first cut were highest for the SLUR 30/30 treatment (slurry 30 m3 at the first and 30 m3 at the third cut) and lowest for the CONTROL treatment.

Ograniczanie wyników

1 Journal of Water and Land Development

1 Polish Journal of Natural Sciences

1 Bogucka B.

1 Burczyk P.

1 Kuikmann P.

1 Oenema O.

1 Velthof G.

1 Winnicki T.

1 2017

1 2001

Wyniki wyszukiwania

Evaluation of different potato fertilization regimes on starch yield - production and economic aspects

Nitrous oxide emission from grassland in different management conditions [fertilization regimes]