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Measuring and modeling water fluxes ...

Dragoni, Danilo.

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Measuring and modeling water fluxes in apple orchards and vineyards in the humid climate of the northeastern US (New York).

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Measuring and modeling water fluxes in apple orchards and vineyards in the humid climate of the northeastern US (New York)./
Author:	Dragoni, Danilo.
Description:	152 p.
Notes:	Adviser: Alan N. Lakso.
Contained By:	Dissertation Abstracts International64-04B.
Subject:	Agriculture, Agronomy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3087673

Measuring and modeling water fluxes in apple orchards and vineyards in the humid climate of the northeastern US (New York).
Dragoni, Danilo.

Measuring and modeling water fluxes in apple orchards and vineyards in the humid climate of the northeastern US (New York). - 152 p.

Adviser: Alan N. Lakso.

Thesis (Ph.D.)--Cornell University, 2003.

For irrigation design and scheduling, water use of crops is commonly estimated from calculated grass reference evapotranspiration (ETo) multiplied by published crop coefficients (kc). This method is assumed to adjust crop values in different climates.Subjects--Topical Terms:

1018679
Agriculture, Agronomy.

Measuring and modeling water fluxes in apple orchards and vineyards in the humid climate of the northeastern US (New York).
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035 $a (UnM)AAI3087673
035 $a AAI3087673
040 $a UnM $c UnM
100 1 $a Dragoni, Danilo. $3 1261537
245 1 0 $a Measuring and modeling water fluxes in apple orchards and vineyards in the humid climate of the northeastern US (New York).
300 $a 152 p.
500 $a Adviser: Alan N. Lakso.
500 $a Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1647.
502 $a Thesis (Ph.D.)--Cornell University, 2003.
520 $a For irrigation design and scheduling, water use of crops is commonly estimated from calculated grass reference evapotranspiration (ETo) multiplied by published crop coefficients (kc). This method is assumed to adjust crop values in different climates.
520 $a However, the simple application of kc may not be accurate in cool, humid climate, especially for tall crops well coupled to bulk air. The aim of this work was to measure actual water use in an apple orchard and vineyard in New York, and to test the values against published kc values. Measurements of water use in dwarf apple trees and vines were made with heat pulse and heat balance sap flow gauges calibrated with whole-canopy gas exchange chambers (to check or correct potentials errors related to the velocity-to-flow assumptions).
520 $a Daily ETo was estimated from meteorological data acquired nearby. Results suggest the inadequacy of using kc values directly from arid climates in cool and humid climates since published kc values generally overestimated the measured water use rates. Also, the crop coefficient concept implies that grass, orchards and vineyards behave the same in all climates; this does not seem to be true in cool humid climates. Grass-to-tree/vine differences in advective flows, boundary layer conditions and stomatal regulation appear to result in varying ET ratios. Modifications that take into account the specific characteristics of apple tree and vine canopy, such as light interception and stomata regulation by environmental factors, were used to adapt a general formulation of Penman-Montieth equation to the orchard and vineyard case. Results are in good agreement with field measures, although overestimations can arise during periods when internal plant factors or other stresses may reduce stomata conductance.
590 $a School code: 0058.
650 4 $a Agriculture, Agronomy. $3 1018679
650 4 $a Biogeochemistry. $3 545717
650 4 $a Biology, Botany. $3 1017825
650 4 $a Biology, Plant Physiology. $3 1017865
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690 $a 0309
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690 $a 0817
710 2 0 $a Cornell University. $3 530586
773 0 $t Dissertation Abstracts International $g 64-04B.
790 $a 0058
790 1 0 $a Lakso, Alan N., $e advisor
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3087673