scholarly journals Evapotranspiração da cultura da cebola

2015 ◽  
Vol 10 (4) ◽  
pp. 58
Author(s):  
G. M. Oliveira ◽  
M. W. Silva ◽  
M. N. Daamen ◽  
E. C. S. Cavalcante ◽  
M. M. V. B. R. Leitão
Keyword(s):  
Social Sciences ◽  
Reference Evapotranspiration ◽  
Irrigation System ◽  
The State ◽  
Estimation Methods ◽  
Crop Evapotranspiration ◽  
Experimental Field ◽  
Evapotranspiration Estimation ◽  
Made In

<p><span>A determinação da quantidade de água necessária para as culturas é um dos principais fatores para o correto planejamento, dimensionamento e manejo de qualquer sistema de irrigação. O presente trabalho teve como objetivo, comparar medida da evapotranspiração da cultura (ETc) da cebola com estimativa obtida a partir da evapotranspiração de referência (ETo) determinada por diferentes métodos e Kc proposto na literatura. O experimento foi conduzido no campo experimental do Departamento de Tecnologia e Ciências Sociais da Universidade do Estado da Bahia - UNEB, em Juazeiro, no período de junho a setembro de 2011. As medidas da ETc foram obtidas em evapotranspirômetros e as estimativas, a partir de ETo determinada pelos métodos: Penman-Monteith (padrão FAO), Penman-Monteith modificado por Villa Nova et al. (2004), Hargreaves &amp; Samani, Makkink e Jensen &amp; Haise e Kc proposto por Marouelli et al. (2005), para a cultura da cebola.<strong> </strong>É fundamental a avaliação de métodos de estimativa da evapotranspiração de referência antes de sua aplicação, pois erros consideráveis podem ser cometidos na determinação da quantidade de água a ser aplicada a uma cultura, o que repercutirá certamente, na produtividade.</span></p><p align="center"><strong><em>Evapotranspiration crop onion</em></strong></p><p><strong>Abstract</strong><strong>: </strong>The determination of the amount of water needed for crops is a major factor for the correct planning, sizing and management of any irrigation system. This study aimed to compare measure of crop evapotranspiration (ETc) onion with estimates obtained from the reference evapotranspiration (ETo) determined by different methods and Kc proposed in the literature. The experiment was conducted in the experimental field of the Department of Technology and Social Sciences, University of the State of Bahia, in Juazeiro, from June to September 2011. The ETc measurements were obtained in evapotranspirometers and estimates, from ETo determined by the methods: Penman-Monteith (FAO standard), Penman-Monteith modified by Villa Nova et al. (2004), Hargreaves &amp; Samani, Makkink and Jensen &amp; Haise and Kc proposed by Marouelli et al. (2005), for the cultivation of onion. It is critical to evaluation of reference evapotranspiration estimation methods before their application because considerable mistakes can be made in determining the amount of water to be applied to a culture, which resonate certainly in productivity.</p><p><span><br /></span></p>

scholarly journals Shoot water content and reference evapotranspiration for determination of crop evapotranspiration

2017 ◽  
Vol 25 (4) ◽  
pp. 387
Author(s):  
J.O. Omondi ◽  
N.W. Mungai ◽  
J.P. Ouma ◽  
F.P. Baijukya
Keyword(s):  
Water Content ◽  
Reference Evapotranspiration ◽  
Crop Evapotranspiration

Determination of the signature of a dynamite source using source scaling, Part 2: Experiment

Geophysics ◽  
1993 ◽  
Vol 58 (8) ◽  
pp. 1183-1194 ◽  
Author(s):  
Anton Ziolkowski ◽  
Karel Bokhorst
Keyword(s):  
Seismic Data ◽  
Scaling Law ◽  
Estimation Methods ◽  
Acceptable Error ◽  
Test Charge ◽  
Source Scaling ◽  
Test Record ◽  
Seismic Data Acquisition ◽  
Made In

In April 1990 we performed an experiment in the Netherlands to test the theory of the determination of the signature of a dynamite source using the scaling law. The theory says that the source signature may be determined from the recorded seismic data using two shots of different charge size at the shotpoint; we used 125 g and 500 g charges. The theory was put at risk with a 250-g test charge at each shotpoint. According to the theory, the test record should be different from the other two and, apart from the noise, should be predictable from them. This experiment was repeated 95 times at approximately 50 m shotpoint intervals, using a 240-channel recording system. The results corroborate the theory within an acceptable error. The second‐derivative of the volume injection function was extracted as the source signature; it varied slightly from shot to shot and was minimum phase. This new method of seismic data acquisition allows the signature of the dynamite source to be obtained from the data, uncontaminated by the earth, and avoids the assumptions that must be made in statistical wavelet estimation methods. If there is good shot‐to‐shot repeatability, the second shot is only needed occasionally for calibration.

Investigations on Yield in the Cereals. Victoria. I. Census studies 1927–29

1931 ◽  
Vol 21 (3) ◽  
pp. 391-409 ◽  
Author(s):  
H. C. Forster ◽  
A. J. Vasey
Keyword(s):  
The State ◽  
Average Weight ◽  
Foot Length ◽  
Made In

Since the year 1927, observations have been made in Victoria on the development of wheat crops of various varieties grown in four different districts of the State.The method used was based on that employed by Engledow in his “Investigations on Yield in Cereals,” by taking counts on numbers of plants in various “foot length” samples scattered in a systematic manner over the areas studied.The basis of the observations was the determination of the values which comprise yield, viz. p = numbers of plants, e = ears per plant, n = number of grains per ear, g = average weight of grain.

scholarly journals Implications of Child Custody in Islamic Family Law: A Case Study of Customary Courts in Oyo State, Nigeria

ICR Journal ◽  
2018 ◽  
Vol 9 (3) ◽  
pp. 362-376
Author(s):  
Aminullahi Adetoro Yusuff
Keyword(s):  
Child Custody ◽  
Family Law ◽  
The State ◽  
Real Problem ◽  
Marital Discord ◽  
Civil Unrest ◽  
Custody Of Children ◽  
Made In

Studies carried out to investigate the immediate and remote causes of marital discord arising from many of the customary courts in Oyo State, Nigeria, revealed that out of 127 divorce-related cases, 87 involved Muslim couples. Out of this number, 53 were linked to custody of children (al-hadanah which is a regulation that has to do with whom should a child stay after the dissolution of marriage for his/her proper nourishment, protection and wellness in the process of upbringing). This issue has led to many serious disputes among Muslim couples and their families in many localities of the state so much that, in many cases, it has led to street fights, vandalisation of property, civil unrest and legal battles. To worsen the situation, without recourse to Islamic marital jurisprudence, judgments are passed in the customary courts in favour of either of the couples. Therefore, the aftermath of the court verdict does not end this debacle in some cases, with to snowballing into spiritual fighting, where family members of the couples bewitch one another to take custody of the children. This problem is not new but it has risen to an alarming proportion these days. It is against this backdrop that an attempt is made in this paper to examine the practice of child custody after divorce or separation in Islam with a view to laying to rest the series of crises associated with the determination of who is to take care of children after divorce and to bring to peoples awareness the shariah rulings on child custody. The paper concludes that al-hadanah is a measure in disguise to safeguard indiscriminate severance of the cord of marriage and that Islam, through its system of law, has provided practical and lasting solutions to every imagined and real problem of man and that adoption of children in its various forms and types is forbidden in Islam.

scholarly journals Evaluation of Evapotranspiration Estimation Models for Junagadh City of Gujarat

2016 ◽  
Vol 11 (2) ◽  
pp. 619-630
Author(s):  
H. H Mashru ◽  
D. K Dwivedi
Keyword(s):  
Performance Evaluation ◽  
Reference Evapotranspiration ◽  
Estimation Method ◽  
Irrigation Scheduling ◽  
Alternative Methods ◽  
Estimation Methods ◽  
Economic Returns ◽  
Field Crops ◽  
Evapotranspiration Estimation ◽  
Estimation Models

Estimation of Evapotranspiration is important for determining the agro-climatic potential of a particular region, water requirement of field crops, irrigation scheduling and suitability of crops or varieties, which can be grown successfully with the best economic returns and therefore numerous models have been developed for determining evapotranspiration. The performance evaluation of commonly used reference evapotranspiration (ET0) estimation methods like FAO 56 Penman-Monteith, Samani and Hargreaves, Makkink, Blaney Criddle, Jensen-Haise, Priestly-Taylor, FAO 24 radiation and Modified Penman Monteith method based on their accuracy of estimation has been undertaken in this study. The inter-relationship between FAO-56 Penman-Monteith method and other reference evapotranspiration (ET0) estimation method is also determined in this study. The results showed that Blaney Criddle method, Modified Penman method, Jensen-Haise method and Priestly-Taylor method are the alternative methods to Penman-Monteith method for better estimate of ET0 for the Junagadh city of Gujarat, India.

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