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The present research covers the time of the second rotation: sugar beet-spring wheat-pea-winter triticale (1999-2002). The investigations were conducted on a very good rye complex soil. A reduced tillage for sugar beet and no-tillage for the other crops in crop rotation result in labor, fuel and energy consumption reduction, as compared with conventional tillage by an average of 50% and expenditure by 42%. The highest energy effectiveness in crop rotation was observed in the system in which sugar beet was cultivated in reduced tillage, and other crops in no-tillage. The effectiveness increases by 135% for conventional tillage for all the crops in rotation. The lowest effectiveness is obtained for conventional tillage with intercrop for sugar beet and pea, and conventional tillage for spring wheat and winter triticale.
This article raises the question of transport infrastructure as a principal component of the social and economic system in any region of the world. Development of transport infrastructure leads to the so-called accumulation of effects obtained through various channels, e.g. upgraded communication and transportation technologies, shorter transit time, lower transport costs, improved safety and better long-term economic output in a given community. This paper presents a model valuation of economic and social effects of an investment made into road transport infrastructure based on a case study of the ring road designed to be constructed around Olsztyn. Analysis of the effects was based on the CBA (cost and benefit analysis) methodology, which is for example employed to evaluate the EU co-financed projects. The method presented herein will ensure more precise valuation of effects generated by planned investment projects and will be a tool supporting the decision-making process.
The work presents the results of investigations conducted in 2004- 2007 to evaluate the residual effect of summer catch crops ploughed as green manures on productive-economic effects of sweet corn cultivation. The experiment was carried out in east-central Poland (52°03’N, 22°33’E). The following summer catch crops were grown: phacelia, amaranth, sunflower, serradella and faba bean. The catch crop seeds were sown in 2004-2006 at three dates: on the 21stJuly, 4th and 18th August. The effect of summer catch crops was compared to FYM applied at the rate of 40 t·ha-1. The catch crops biomass (roots + above ground parts) and FYM were incorporated in the third decade of October. Sweet corn seeds (6 kg·ha-1) were sown in mid-May, in the years 2005-2007, at the between – and inter- row spacing of 65 × 20 cm. Sweet corn ears were hand-harvested at the stage of milk maturity of kernels, at the turn of August and September. During the harvest marketable yield of ears (t·ha-1) and number of marketable ears per 1 ha were determined. Economic evaluation of sweet corn cultivation under diversified organic fertilization was conducted according to the standard gross margin method. The calculation was based on the 2014 prices. The highest yield and number of ears were obtained after catch crops with faba bean and phacelia sown on the 21st July and after FYM. Delaying the sowing date of catch crops resulted in a decrease in the successive yielding effect. The highest gross margin (25267.66 PLN·ha-1 and 0.56 PLN per 1 ear) and profitability index (332%) were achieved in the sweet corn cultivation after catch crop with faba bean sown on the 21st July. Compared to the plot with FYM, a higher level of gross margin and profitability index were obtained after all catch crops sown on the 21st July and the 4th August. Irrespective of investigated factors, profitability index was on a very high level amounting to 211-332%.
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