Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Riscuri ?i Catastrofe , 2013,
Abstract: The Reference Evapotranspiration and the Climatic Water Deficit in the Western Plain of Romania, North of the Mure River. In the present paper, reference evapotranspiration (ET0) was calculated by the method proposed by C.W. Thornthwaite. The climatic water deficit, as the difference between atmospheric precipitation and ET0, has also been calculated and analyzed. In this respect, monthly and annual air temperature and precipitation data from 10 weather stations were used. The analysis period was 1961-2002. The result was that the annual average reference evapotranspiration varies, throughout the Western Plain of Romania, North of the Mure River territory, between 665 and 700 mm. It decreases from south to north and also from west to east, depending on the territorial distribution of the air temperature. The plain territory reveals an annual climatic water deficit between 63 mm in the north of the plain and 171 mm in its south. Therefore, the predominantly agricultural territory of the plain needs a water surplus from irrigation. Only in the east of the plain, at Holod, there is a surplus of moisture.
The Effect of Deficit Irrigation on Potato Evapotranspiration and Tuber Yield under Cool Season and Semiarid Climatic Conditions  [PDF]
Fatih M. Kiziloglu,Ustun Sahin,Talip Tunc,Serap Diler
Journal of Agronomy , 2006,
Abstract: Field experiments were conducted to study the effects of water deficits on potato (Solanum tuberosum L.) evapotranspiration, tuber yield and water-use efficiency. The experiments were carried out under cool season semiarid climatic conditions in Erzurum province located in the east of Turkey in the spring seasons of 2003 and 2004. The experiment included six water deficits: 0% (well-irrigation), 20, 40, 60, 80 and 100% (non-irrigation). Results indicate that deficit irrigation influenced evapotranspiration, tuber yield and water-use efficiency. Potato evapotranspiration decreased as water deficit increased. Seasonal evapotranspiration was 445.2 mm in well-irrigated treatment and 195.2 mm non-irrigated treatment. Potato yield and water-use efficiency were also found decrease as water deficit increased. Potato yield of well-irrigated treatment was 26.43 t ha-1 while 8.28 t ha-1 in non-irrigated treatment. A linear relationship was found between evapotranspiration and tuber yield. Water use efficiency was 59.56 kg/ha/mm for well-irrigated treatment and 42.13 kg/ha/mm for non-irrigated treatment. The seasonal yield response factor (ky) for potato was also found as 1.12.
Relationships among the length,perimeter increasing of cucumber fruit and climatic factors in self controlled greenhouse

Yang Qiu-zhen,Li Jun,Li Yu-min,
,李 军,李育民

中国生态农业学报 , 2000,
Abstract: Relationships among the length,perimeter increasing of Holland cucumber fruit and climatic environment factors in self-controlled greenhouse were analyzed. Climatic factors affecting fruit's length and perimeter increasing velocity were pointed out. To adjust and control the climatic environment in greenhouse properly could increase yield and decrease cost.
Aplica??o do "ISAREG" no manejo da irriga??o na cultura da melancia no Baixo Acaraú, Ceará
Saraiva, Kleiton Rocha;Bezerra, Francisco Marcus Lima;Souza, Francisco de;Camboim Neto, Luis de Fran?a;
Revista Ciência Agron?mica , 2013, DOI: 10.1590/S1806-66902013000100007
Abstract: the objective of this study was to apply the isareg software model to the irrigation management of watermelon in the lower acaraú irrigated perimeter (laip). to this end, the soil water-balance was analysed, developing an irrigation schedule which aimed for maximum crop yield for the soil and climatic conditions of the laip for a specific planting date and comparing it to the irrigation scheme currently adopted by irrigators. with an aim to the practical application of isareg, the model was supplied monthly with climatic variables, precipitation and soil data, and information on the crop. finally, an irrigation option available in isareg was selected, and a simulation of the soil water-balance was carried out. questionnaires were used in order to get information about the irrigation scheme employed at the laip. the research showed that the producers of watermelon at the laip are not properly managing water resources. during the crop cycle, irrigators are applying an excess of about 215.2 mm of water at some periods, and a deficit of 24.2 mm to the crops in others.
Performance of the irrigameter in management of irrigation in the Jaíba Irrigated Perimeter, MG, Brazil  [cached]
Ednaldo Miranda de Oliveira,Rubens Alves de Oliveira,André Leonardo Tavares de Paula,Júlio César Machado Baptestini
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2011,
Abstract: The objective of this study was to determine the coefficient of irrigameter device (KI) and to assess its performance in the irrigation of sunflower. The experiment was conducted in the Jaíba Irrigated Perimeter, Jaíba, MG, located at 15° 36' S and 43° 42' W, with an altitude of 460 m. For the evaluation of the performance of the irrigameter, the water level in the evaporimeter was kept at 1, 2, 3, 4, 5 and 6 cm high, and the evapotranspiration estimated by the irrigameter was compared to the reference evapotranspiration, calculated by the standard method Penman-Monteith FAO 56 (Allen et al., 1998). It was concluded that the values of KI obtained were 0.42, 0.69, 0.85, 1.07, 1.34 and 1.61 for the water levels in the evaporimeter corresponding to 1, 2, 3, 4, 5 and 6 cm, respectively. There was no significant difference between the yield of sunflower crop irrigated during day or night time; higher average values then reported by the literature were found. The irrigameter device was found to be satisfactory for irrigation control. To estimate the reference evapotranspiration in similar regions with similar climatic conditions, it is recommended to use the unit with evaporimeter adjusted to the level 3.7 cm.
The Diary of an European: Titu Maiorescu. Multilinguisme and Translation
Bogdan Mihai DASC?LU
Studii de Stiinta si Cultura , 2012,
Abstract: This article presents a part of the research conducted by the author for the preparation of the first volume of the critical edition of Titu Maiorescus Diary, which is written in Romanian, French, Italian, Latin etc. The difficulties encountered were not only the deciphering of the manuscript, but also the transferring of typical 19th century expressions into nowadays Romanian.
Random sets of finite perimeter  [PDF]
Jan Rataj
Mathematics , 2014, DOI: 10.1002/mana.201300341
Abstract: An approach to modelling random sets with locally finite perimeter as random elements in the corresponding subspace of $L^1$ functions is suggested. A Crofton formula for flat sections of the perimeter is shown. Finally, random processes of particles with finite perimeter are introduced and it is shown that their union sets are random sets with locally finite perimeter.
Characterization of Climatic Data for Predicting Growing Period, the Case of Maichew, Northern Ethiopia
Molla Mekonnen Alemu
Open Access Library Journal (OALib Journal) , 2016, DOI: 10.4236/oalib.1102560
Abstract: In terms of improved crop production, knowledge and information of the crops and crop varieties grown in a given area is a better measure of climate, as applied to crop production in that region, than are complete climatic records. Water is the main element of living plant tissues. Water facilitates the movement of nutrients from the soil to the plant roots and upward throughout the plant tissues. It also provides hydrogen as an element of organic materials formed during photosynthesis. The transpiration of water also helps to cool plants during harsh temperature conditions. The effectiveness of a given rainfall for crop production highly depends on the time of the year that it falls along with its intensity. In moisture deficit areas, the deficiency could be overcome by supplementary irrigation and moisture conserving agronomic practices. Apart from this, the use of improved varieties like early maturing crops will also hold a paramount importance to combat such problems. In arid and semi-arid zones, the conservation and efficient utilization of the available scanty rainfall plays a significant role in the whole production system since it can relegate all other factors, including soil fertility, to minor positions. Therefore, knowledge on growing period has a central role in improving crop production. Thus, this paper is aimed at characterizing climatic data for predicting the growing period in the case of Maichew, Northern Ethiopia.
The Axis and the Perimeter of the Temple  [PDF]
Subhash Kak
Physics , 2009,
Abstract: This paper presents textual evidence for an astronomical basis of the dimensions of the axis and perimeter in the plan of the Indian temple.
Ramanujan's Perimeter of an Ellipse  [PDF]
Mark B. Villarino
Mathematics , 2005,
Abstract: We present a detailed error analysis of Ramanujan's most accurate approximation to the perimeter of an ellipse.
Page 1 /100
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.