Refine search
Results 1-3 of 3
Determination of Evapotranspiration and Optimum Irrigation Schedule for Cotton in Çukurova Region Using CROPWAT Model Full text
2025
Usman Muhammad Umar | Burak Şen | Zeynep Ünal
The agriculture sector is actively looking for the most effective ways to manage water resources. Proper water management is crucial for increasing agricultural productivity and optimizing the region’s water usage efficiency. The purpose of this study was for estimating the irrigation water requirement, reference and crop evapotranspiration and irrigation schedule for cotton in Çukurova region over a 31-year period (1990-2020) using the CROPWAT model. To ensure appropriate water utilization and planning, information regarding the climate data was obtained from the Adana station of Turkish State Meteorology Service. The soil and crop data were sourced from Turkey’s directorate of agricultural research and policies. The dates, amounts, effective rainfall, net irrigation requirement (NIR), and yield decrease for rainfed and different irrigated conditions were all calculated using the CROPWAT 8.0 model. The findings indicated that the average reference evapotranspiration (ETo), crop evapotranspiration (ETc) for cotton and effective rainfall were 918.9 mm, 809.5 mm, and 149.4 mm respectively. It was also estimated that the dates of irrigation after planting (DAP) were 72 days, 101 days, 131 days and 170 days. The total quantity of water utilized for irrigation throughout the growing season at critical depletion and user defined were 700 mm and 545 mm respectively, thus 155 mm of water was saved (22%). Data of maximum crop yield obtained at critical depletion by CROPWAT was associated with data from Turkish Statistical Institute (TUIK) (2014-2020) and TUIK data is compared with CROPWAT data which was estimated under rainfed condition. According to the result 51% of yield reduction was simulated when irrigation was not applied.
Show more [+] Less [-]Systematic review: Effect of Irrigation Water Quality and Deficit Irrigation on Crop Yield and Water Use efficiency Full text
2020
Lelisa Endalu Tura | Tasisa Temesgen Tolossa
Systematic review: Effect of Irrigation Water Quality and Deficit Irrigation on Crop Yield and Water Use efficiency Full text
2020
Lelisa Endalu Tura | Tasisa Temesgen Tolossa
The main purpose of this paper is to review on the effect of irrigation water quality and deficit irrigation on crop yield and water use efficiency. Low quality water for irrigation can impose a major environmental constraint to crop productivity. If salts become excessive, losses in yield will result. To prevent yield loss, salts in the soil must be controlled at a concentration below that which might affect yield. Irrigation application below the full evapotranspiration requirement is termed as deficit irrigation. Deficit irrigation consists of deliberately applying irrigation water in amounts below the plant’s water requirements. Deficit irrigation can be applied at certain periods during the crop’s growing season or throughout its growing season. Yield reductions also occur in a number of crops when subjected to water stress. Yield reductions depend on the crop’s sensitivity to water stress at its various growth stages. In order for deficit irrigation to be an economically viable practice, the revenue lost due to yield reduction should be lower than savings in total cost of production. The goal of deficit irrigation is to increase crop water use efficiency by reducing the amount of water that is applied or by reducing the number of irrigation events. The interaction effects of water quality and DI illustrated that when the two types of stresses; saline and DI were coupled together, a serious reduction occurred on total dry biomass and total yield. The interaction effects of water quality and deficit irrigation illustrated that when the two types of stresses; saline and deficit irrigation were coupled together, a serious reduction occurred on total dry biomass and total yields.
Show more [+] Less [-]Brexit a sytuacja ekonomiczna Wielkiej Brytanii Full text
Czech, Katarzyna | Wielechowski, Michał
On 23th June, 2016, British voters decided in a referendum to cut long-term relationship with the European Union. The aim of a paper is to present the impact of UK’s Brexit vote on the British economy. The paper depicts review of international scientific literature and economic press concerning the vast range of issues affected by Brexit. It has been shown that the British referendum outcome caused the growth of uncertainty about economy of the United Kingdom. Economic Policy Uncertainty Index reached British record-high levels in post-referendum period. Growing economic and financial uncertainty had negative effects on British economic activity. The paper presents the impact of the referendum on British currency, fundamental macroeconomic indicators, economic activity in manufacturing, and public finance. It has been shown that, in post-referendum period, the pound sterling plunged the depths it had reached after the speculative attack on pound sterling led by George Soros in 1992, after invasion of Iraq in 2003 and during financial crisis in 2008-2009. British referendum outcome contributed also to inflation rate increase and GDP growth rate decrease. Thus, the United Kingdom decided to implement more expansionary monetary policy by cutting interest rates and increasing quantitative easing. As a result of the referendum, the level of economic activity in the manufacturing sector went shortly down. Britain’s vote to leave the EU had also a negative impact on British public finances. The forecasted general government deficit in 2017 increased by more than 30 percent. Chancellor of the Exchequer was forced to abandon the ambitious goal of eliminating the negative balance by fiscal year 2019–2020. Celem artykułu jest przedstawienie wpływu wyniku referendum z 23 czerwca 2016 r. dotyczącego wyjścia Wielkiej Brytanii z Unii Europejskiej na stan gospodarki i finansów tego kraju. Publikacja zawiera przegląd światowej literatury i prasy ekonomicznej odnoszących się do kwestii następstw decyzji Brytyjczyków o opuszczeniu struktur unijnych. W artykule przedstawiono, że wynik referendum przyczynił się do wystąpienia rekordowych poziomów indeksu niepewności polityki gospodarczej (EPU) w Wielkiej Brytanii. Wysoki poziom niepewności ekonomicznej i finansowej wywarł w konsekwencji negatywny wpływ na kondycję brytyjskiej gospodarki. W artykule pokazano wpływ wyniku referendum na wartość brytyjskiej waluty, poziom podstawowych wskaźników makroekonomicznych, poziom aktywności gospodarczej w sektorze wytwórczym oraz sferę finansów publicznych. Kurs funta szterlinga w odniesieniu do dolara amerykańskiego i euro uległ silnej deprecjacji i spadł poniżej poziomów osiąganych w trakcie ataku spekulacyjnego przeprowadzonego przez George’a Sorosa w 1992 r., inwazji na Irak w 2003 r., czy kryzysu finansowego w latach 2008–2009. Wynik referendum można łączyć ze wzrostem inflacji oraz spadkiem tempa wzrostu PKB. Wielka Brytania zdecydowała się na wprowadzenie bardziej ekspansywnej polityki monetarnej poprzez obniżenie poziomu bazowej stopy oraz rozszerzenie programu luzowania ilościowego. Poziom aktywności gospodarczej w sektorze wytwórczym uległ krótkookresowemu obniżeniu w konsekwencji wyniku referendum. Perspektywa Brexitu miała również negatywny wpływ na stan brytyjskich finansów publicznych. Wysokość prognozowanego ujemnego salda finansów publicznych w 2017 r. wzrosła o ponad 30 proc., a minister finansów zmuszony był odstąpić od realizacji ambitnego celu eliminacji deficytu budżetowego do roku fiskalnego 2019–2020.
Show more [+] Less [-]Systematic review: Effect of Irrigation Water Quality and Deficit Irrigation on Crop Yield and Water Use efficiency Full text
2020
Lelisa Endalu Tura | Tasisa Temesgen Tolossa
The main purpose of this paper is to review on the effect of irrigation water quality and deficit irrigation on crop yield and water use efficiency. Low quality water for irrigation can impose a major environmental constraint to crop productivity. If salts become excessive, losses in yield will result. To prevent yield loss, salts in the soil must be controlled at a concentration below that which might affect yield. Irrigation application below the full evapotranspiration requirement is termed as deficit irrigation. Deficit irrigation consists of deliberately applying irrigation water in amounts below the plant’s water requirements. Deficit irrigation can be applied at certain periods during the crop’s growing season or throughout its growing season. Yield reductions also occur in a number of crops when subjected to water stress. Yield reductions depend on the crop’s sensitivity to water stress at its various growth stages. In order for deficit irrigation to be an economically viable practice, the revenue lost due to yield reduction should be lower than savings in total cost of production. The goal of deficit irrigation is to increase crop water use efficiency by reducing the amount of water that is applied or by reducing the number of irrigation events. The interaction effects of water quality and DI illustrated that when the two types of stresses; saline and DI were coupled together, a serious reduction occurred on total dry biomass and total yield. The interaction effects of water quality and deficit irrigation illustrated that when the two types of stresses; saline and deficit irrigation were coupled together, a serious reduction occurred on total dry biomass and total yields.
Show more [+] Less [-]