Browsing by Author "Iurchevici, Lidia"

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    Determinarea funcţiilor economice restrictive şi a tendinţelor de evoluţie a sistemelor agricole în regiunea Sud-Est a României
    (IEFS, 2012) Iurchevici, Lidia; Chetroiu, Rodica
    The purpose of the work is to determine the development trend of the agricultural activities in South-Eastern Region of Romania, in order to improve the plant and animal systems efficiency. To elucidate these systems trends in territorial profile, has been used the regression function method or least squares method, represented graphically by the line (curve) of regression. This is expressed as an analytic function appropriate to the link between factorial feature and outcome. In relation to the approximating function shape F (x) can be applied several types of regression: polynomial, exponential, logarithmic, hyperbolic etc. If the approximation polynomial has degree p = 1, the criterion of least squares application leads to linear regression: F(x) = a + bx. If the approximation polynomial has degree p = 2, applying the least squares criterion leads to the quadratic regression: F (x) = a + bx + cx2. The practical results of applying statistical and mathematical presented methods are reflected in the analysis of agricultural systems in South-Eastern Region, during 2000-2010, and graphic projecting of their trends (forecasts) in the region studied, by the year 2021.
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    Evoluţia indicatorilor de agro-mediu în regiunea Sud-Muntenia
    (IEFS, 2012) Chetroiu, Rodica; Iurchevici, Lidia
    The South - Muntenia Region is situated in the South-East of Romania, bordering at North with Central Region, at East with South – East Region, at South with Bulgaria, the limit being given by the natural boundary - the Danube river, and at West with South – West Region. The South - Muntenia Region is composed of: seven counties (Arges, Calarasi, Dambovita, Ialomita, Giurgiu, Prahova and Teleorman), 16 municipalities, 32 cities and 519 communes with 2019 villages. The agricultural area, mainly concentrated in the southern counties, holds 71.1% of the total region area, of which 80.2% is arable land. The work studies the evolution, during 2000 - 2010, of the following agri-environment indicators specific of the agriculture in the South - Muntenia Region: irrigated area, surface with drainage works, area furnished for land improvement and soil erosion prevention, surface with fertilizers on, quantity of fertilizers, surface with pesticides on, quantity of pesticides. The agricultural area furnished for irrigation, the land prepared with drainage works and area furnished for land improvement and soil erosion prevention were maintained almost constant during the analyzed period. The drainage work marks a leap in 2001 compared to 2000, remaining at that value thereafter. Have increased quantities of chemical fertilizers and the natural ones marked a decrease both overall and in the private sector.
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    Furajarea puilor de carne-hibrid ross 308. Eficienţa economică
    (IEFS, 2011) Iurchevici, Lidia; Chetroiu, Rodica
    Should be known in the growth of broilers breed standard requires their feeding in a certain way to achieve high performance at slaughter. Three ways of feeding are performed: - starter feeding (0-10 days) where the requirements of broilers in this period can be provided with a combined feed with the following structure: 53.5% corn, 31% soybean meal, 7%sunflower meal, 5% fish meal, 0.25 %D.L. methionine, 1.2% calcium carbonate, 0.3% salt, 1% vitamin-mineral premix. - growth feeding is administered generally for 14-16 days with following feed: 55.15% maize, 28% soybean meal, 7% sunflower meal, 5% fish meal, 0.15% D.L. methionine, 1.2% calcium carbonate, 0.8% monocalcium phosphate, 0.3% salt, 1% vitamin-mineral premix. - finishing feeding, the period starting with approximately 25 days, requiring a higher energy level, with the next structure of combined feed: 56.85% corn, 30.5% soybean meal, sunflower meal 7%, 2% oil, 0.15% D.L. methionine, 1.4% calcium carbonate, 0.8% monocalcium phosphate, 0.3% salt, 1% vitamin-mineral premix. These structures of combined fodder finally lead to obtain broilers that reach weights of about 2.5 kg in just 6 weeks and production costs to ensure encouraging profits.