Ograniczanie wyników

Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 35

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  energetic value
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Field experiments were carried out at the Didactic and Experimental Farm in Swadzim (52°26’ N; 16°45’ E) near Poznań in the years 2004-2007. The experiment was carried out in a „split-plot” design with 3 experimental factors and 4 field replications. Two cultivars were studied, 6 doses of nitrogen, one dose of magnesium and the method of fertilizer application were investigated. The content of total protein and N-free extract in the dry matter of grain depends exclusively on the level of nitrogen fertilization. As far as ash content is concerned, it was found that the value of this feature depends only on the cultivar factor. The contents of raw fibre and raw fat were not determined by any of the experimental factors. A higher yield of total protein was obtained from the hybrid LG 2244 in comparison with Anjou 258. Analysis of the amount of nitrogen fertilization has shown that the significantly highest yield of protein was obtained for a dose of 90 kg N.ha⁻¹. On the other hand, a further increase in nitrogen dose caused a significant breakdown of this feature value. Magnesium fertilization amount and the method of its application did not exert any effect on the yield of total protein. The concentration of net energy was not affected by any experimental factors, while the yield of grain net energy was determined by the amount of nitrogen fertilization. The yield of digestible protein depended in a significant way on the cultivar factor and on nitrogen fertilization.
15
58%
Vegetables are important dietary components and constitute a group of the lowest calorie raw produce with a high nutritional value. The aim of the present study was to determine the nutritional and energy potential of the leaves of rocket (Eruca sativa Mill.) as affected by different regimes of plant nitrogen and potassium nutrition. Plants were grown in a greenhouse in a peat substrate, using varying amounts of nitrogen and potassium: 0.3 and 0.6 N as calcium nitrate (Ca(NO₃)₂) as well as 0.3 K, 0.6 K, and 0.9 K in the form of potassium sulphate (K₂SO₄ ) and potassium chloride (KCl), with a constant level of the other macro- and micronutrients. Fresh leaf yield and the content of soluble sugars, fat, ash and dietary fibre were determined, as well as the caloric value of the plant material studied was estimated. It was shown that the nutritional value of rocket leaves could be increased by using an appropriate system of plant mineral nutrition. The use of KCl significantly increased the nutritional value of rocket leaves, as determined by the presence of fat and dietary fibre. The application of K₂SO₄ proved to be more beneficial due to the concentration of carbohydrates and available carbohydrates. An increase in the rate of nitrogen caused an increase in biomass and fat content, but also contributed to a decrease in the concentration of glucose and fructose. The higher rates of potassium had an effect on increasing the content of fat, ash and glucose. The energy value of rocket leaves was not modified by mineral fertilization applied.
In this contribution, there are presented the results of determination of energetic characteristics of green chips of wood species Populus Deltoides clone Cifra such as: share of bark in chips, elementary chemical composition of chip combustible, volume of ashes in dry mass of bio-fuel and lower heating value of bio-fuel in dry state. Green chips made of branches of wood species grown on plantations: Populus Deltoides clone Cifra consists of juvenile wood and juvenile bark. The share of juvenile bark in analysed green chips XB = 43,41 ± 3,76 %. The chemical composition of the combustible of green chips consists of: Cdaf = 49,69 %, Hdaf = 5,82 %, Odaf = 43,96 % and Ndaf = 0,53 %. The combustible of green chips does not differ from the chemical composition of combustible of fuel wood except for nitrogen, whose value is 3 times higher, than the amount of nitrogen in fuel wood. The share of ashes from green chips produced from branches of trees of fast growing wood species: Populus Deltoides clone Cifra, determined by form of weighted mean of the content of ash in juvenile wood, juvenile bark and the share of bark in chips is Ad = 2,49 %, which is 3,5 to 5,0 times higher value, than the value of share of ash from broad-leaved wood species. The lower heating value of subjected chips in dry state is Qn = 17 507 kJ.kg-1. This value is, in comparison with the lower heating value of wood of broad-leaved wood species shown in EN 14 961 Solid bio-fuels – Specification and classes of fuels, lower by 4,5 % .
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.