1,126 research outputs found
Rapid tubewell development versus sustainable farmer-managed irrigation in Baluchistan
Tube wells, Farmer managed irrigation systems, Irrigation systems, Environmental effects, Pakistan
Inception report on the Technical Assistance study (T.A. No. 1481-PAK): Crop based irrigation operations in the NWFP
Irrigation systems / Irrigation practices / Cropping systems / Water requirements / Pakistan
Crop-based irrigation operations in the North West Frontier Province of Pakisatn. Vol.I: Synthesis of findings and recommendataions. Final Report
Irrigation management / Crop-based irrigation / Pakistan / North West Frontier Province
Crop-based irrigation operations in the NWFP: Progress report no.2, Kharif 92 on the Technical Assistance Study, T.A. No.1481-PAK
Irrigation operation / Cropping systems / Irrigation canals / Water users' associations / Institutions / Pakistan
Impact assessment of irrigation management transfer in the Alto Rio Lerma Irrigation District, Mexico
Irrigation managementPrivatizationAssessmentEconomic aspectsLegal aspectsData collectionWater rightsWater allocationWater distributionGroundwaterFinancingMaintenanceOperationsAgricultural productionWater users' associationsFarmer participation
A framework for future training in marine and coastal protected area management
Training, Protected areas, Marine environment, Coastal zone management
Evaluation of initial growth of poplar clones in North Patagonia
En los valles irrigados de Río Negro y
Neuquén, el cultivo de álamos acompañó
históricamente la producción agrícola,
utilizándose clones de Populus nigra L. en cortinas
rompeviento y clones de Populus xcanadensis
Moench. para las forestaciones en macizo.
Buscando ampliar la disponibilidad de genotipos
para los diferentes sitios de cultivo, se instaló
un ensayo comparativo con trece clones de
álamo en la localidad de Pomona, Provincia
de Río Negro. Se evaluaron seis clones de
P. xcanadensis ('Triplo', 'Ragonese 22 INTA',
"Pangui INTA", "Pudú INTA", y los testigos
comerciales 'Conti 12' e 'I-214'), seis clones de
P. deltoides ('Harvard', 'Onda', 'Stoneville 67',
'Carabelas INTA', "20-82" y "C-657") y un clon de
P. xcanescens. Se utilizó un diseño experimental
de bloques completos al azar (DBCA) con quince
repeticiones y parcelas de una planta. Luego
de cuatro períodos de crecimiento, 'I-214' y
'Triplo' tuvieron los mayores incrementos de
DAP, no encontrándose diferencias significativas
con los valores de 'Conti 12', 'Ragonese
22 INTA', "Pangui INTA", "Pudú INTA", "20-82" y
P. xcanescens. Los menores crecimientos fueron
observados en los deltoides 'Stoneville 67' y
"C- 657". Los clones 'Ragonese 22 INTA', 'Triplo'
y "20-82" constituyen alternativas para el cultivo
de álamos en macizos y cortinas rompeviento.In the irrigated valleys of Río Negro
and Neuquén poplar cultivation historically
accompanied agricultural production using
clones of Populus nigra L. in shelterbelts
and Populus xcanadensis Moench. in forest
plantations. With the aim to extend the availability
of genotypes for different cultivation sites,
a comparative trial with thirteen clones of
poplar was installed at Pomona, Río Negro
province. Six clones of euramerican hybrid
poplar (P. xcanadensis 'Triplo', 'Ragonese
22 INTA', "Pangui INTA", "Pudú INTA" and
commercial control 'Conti 12' and 'I-214'),
six clones of eastern cottonwood poplar
(P. deltoides 'Harvard', 'Onda', 'Stoneville 67',
'Carabelas INTA', "20-82" and "C-657") and
one clone of P. xcanescens were evaluated. A
completely randomized block design was used
with fifteen replications and one plant per plot.
After four growth periods, 'I-214' and 'Triplo'
had the largest increases of diameter at breast
height (DBH) while no significant differences in
the values of 'Conti 12', 'Ragonese 22 INTA',
"Pangui INTA", "Pudú INTA", "20-82" and
P. xcanescens were found. The lowest increases
were observed in deltoids 'Stoneville 67' and
"C- 657". 'Ragonese 22 INTA', 'Triplo' and
"20- 82" are alternatives for growing poplar in
forest plantations and shelterbelt.Fil: Thomas, Esteban R..
Instituto Nacional de Tecnología Agropecuaria (Argentina)Fil: Garces, Anibal C.
Localized vibrational modes in optically bound structures
We show, through analytical theory and rigorous numerical calculations, that
optical binding can organize a collection of particles into stable
one-dimensional lattice. This lattice, as well as other optically-bound
structures, are shown to exhibit spatially localized vibrational eigenmodes.
The origin of localization here is distinct from the usual mechanisms such as
disorder, defect, or nonlinearity, but is a consequence of the long-ranged
nature of optical binding. For an array of particles trapped by an interference
pattern, the stable configuration is often dictated by the external light
source, but our calculation revealed that inter-particle optical binding forces
can have a profound influence on the dynamics.Comment: 4 pages, Optical Bindin
Crop-based irrigation operations in the North West Frontier Province of Pakistan. Vol.II: Research approach and interpretation. Final Report
Irrigation management / Crop-based irrigation / Research / Irrigation canals / Water demand / Performance evaluation / Agricultural production / Pakistan / North West Frontier Province
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