Crop yield response to water - Cra

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FIGURE 10 Crop coefficient (K c ) curve determined for a mature, drip-irrigated, apple orchard with a weighinglysimeter in 2006, at Lleida, Spain. Note that the decline in K c after harvest occurs close to theonset of leaf senescence in apple trees.K c1.21.0Apple2006Harvest0.80.60.40.20.00 50 100 150 200 250 300Day of yearmature trees that have reached their maximum size. In intensive production systems, thisis equivalent to attaining a percent ground cover (horizontal projection) of no more than70-80 percent; maximum ground cover values are generally dictated by harvesting and otherorchard mechanized operations. Mature traditional orchards and vineyards generally havelower ground cover values, although such values can be over 80 percent in a few species, suchas walnuts or table grapes.To schedule irrigation for developing plantations or in sparsely planted orchards, as is thecase in traditional plantations under limited water supply, it is necessary to relate the ET of ayoung orchard to that of a mature orchard, for which the K c values were developed. If the K capproach is used, a new coefficient is needed to compute ET as:(9) ET c = ET o K c K r,tWhere, K r,t is an empirical coefficient relating the ET of an orchard of incomplete cover to thatof a mature orchard. Here, the K r,t is related to the horizontal projection of the tree shade(ground cover).Figure 11 shows the relation between percent ground cover and percent ET of a matureorchard, based on an original one obtained experimentally for almond trees (Fereres et al.,1982) and adjusted with data from experiments on several tree species. Box 6 shows twoexamples on how to calculate the ET of immature tree canopies of different sizes. The treecanopy parameter used in the equation in Figure 11, is the horizontal projection of the canopy,without correcting for differences in leaf area density that could leave gaps within the treeshade. Note that this relationship has been developed for tree canopies of various shapes butall of them formed as isolated trees, with some sort of spherical or conical shape.Yield Response to WateR of fRuit tRees and Vines 265
ox 6 Examples for determining ET of canopies with partial cover.The relationship shown in Figure 11 may be approximated between 0 and 70 percentground cover (G%) using the equation:(10) K r,t = -0.00012 (G%) 2 + 0.0226 (G%)The two examples below refer to citrus and almond trees where the average horizontalprojection of the tree canopy has diameters of 2.8 and 1.2 m, respectively.Diameter(m)Treespacing(m)% GroundcoverK r,tET o(mm/day)K cET c1(mm/day)Examplecitrus2.8 5 x 4 30.8 0.58 5.0 0.70 2.03Examplealmond1.2 7 x 6 2.7 0.06 7.4 1.05 0.471 ET c = ET o K c K r,tfigure 11 Relationship between tree horizontal projection at midday (Percent ground cover) and thereduction coefficient, K r,t , relating the ET of orchards with partial cover to that of mature, fullcover plantations formed by isolated trees (for hedgerows, see Apple Section).K r,t1.00.80.60.40.200 10 20 30 40 50 60 70 80Percent ground cover266crop yield response to water
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Crop yieldresponse to waterFAOIRRIG
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1. IntroductionFood production and
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Lead AuthorsMartin Smith(formerly F
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3. Yield response to waterof herbac
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The WP parameter introduced in Aqua
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figure 7 The root zone depicted as
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threshold and 1.0 at the lower thre
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also calculated by multiplying with
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FIGURE 14 Schematic representation
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figure 17ClimateInput data defining
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Table 1 Conservative crop parameter
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figure 18 The Main AquaCrop menu.di
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Applications to Irrigation Manageme
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Box 1 Simulating deficit irrigation
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for each planting date. If there ar
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ox 2 (CONTINUED)FIGURE 1 Difference
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Heng, L.K., Hsiao,T.C., Evett, S.,
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Table 2Additional information and d
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capacity (FC) and permanent wilting
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densities. This range is referred t
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Table 3Comparison of simulated with
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In Equation 3 C a is the mean air C
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REFERENCESAllen, R., Pereira, L., R
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Lead AuthorSenthold Asseng(formerly
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Figure 1 World wheat harvested area
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When nutrition is limiting, yield p
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wheat 101
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Figure 1 World rice harvested area
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Response to StressesBecause rice ev
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Lead AuthorTheodore C. Hsiao(Univer
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emergence to flowering is about 65
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ReferencesAyers, R.S. & Westcot, D.
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Figure 1 World soybean harvested ar
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A number of studies indicate that s
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ReferencesBhatia, V.S., Piara Singh
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Figure 1 World barley harvested are
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Barley development may be thought o
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The seasonal water requirements for
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Lead AuthorSuhas P. Wani(ICRISAT, A
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sowing usually starts in late Septe
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loss. If water stress is severe eno
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ReferencesFAO. 2011. FAOSTAT online
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Figure 1 World cotton harvested are
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Response to StressesCotton stands o
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FAO. 2011. FAOSTAT online database,
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spring. In double cropping, sowing
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size as affected by soil water defi
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sunflower 171
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to produce energy (electricity from
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Response to stressLow temperatureSu
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Sugarcane 181
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Figure 1 World potato harvested are
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initiation, vigorous canopy, profus
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ReferencesBradshaw, J.E. 2009. A ge
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Tomato requires soils with proper w
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and there is frequent wetting of ex
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is so excessive that fruit setting
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Lead AuthorsMichele Rinaldi(CRA, Ba
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North Africa and near East ranges f
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Water use & ProductivitySugar beets
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ReferencesAllen, R.G., Pereira, L.S
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Figure 1 Alfalfa harvested area (SA
Page 231 and 232: Water use & ProductivityAs a perenn
Page 233 and 234: SalinityAlfalfa is tolerant to rela
Page 237 and 238: Lead AuthorAsha Karunaratne(formerl
Page 239 and 240: Generally, the growing season begin
Page 241 and 242: FAO. 2011. FAOSTAT online database,
Page 244 and 245: *Flower and grain colour presented
Page 246 and 247: Figure 1 World quinoa harvested are
Page 248 and 249: with typical values around 10.5 g/m
Page 250: ReferencesAlvarez-Jubete, L., Arend
Page 254 and 255: Growth and developmentThe common me
Page 256 and 257: soils (EARO, 2002). Tef has some to
Page 258: tef 243
Page 261 and 262: Lead AuthorsElias Fereres(Universit
Page 264: equirements per unit land area for
Page 268 and 269: figure 6 The water balance of an or
Page 270 and 271: ox 2 Understanding the transpiratio
Page 272: Orchard transpirationTree Tr is det
Page 276 and 277: ox 4 Sample calculation of E dz , E
Page 278 and 279: ox 5 Computing olive tree transpira
Page 282 and 283: For training systems on a vertical
Page 284 and 285: ox 7Consumptive and non-consumptive
Page 286 and 287: are seeking more precision in their
Page 288 and 289: ox 9 Examples of soil water monitor
Page 290 and 291: ox 10 (CONTINUED)The major limitati
Page 292 and 293: ox 12Definition of CWSI and an exam
Page 294 and 295: The water budget methodWith this me
Page 296 and 297: ox 15 Evolution of soil water under
Page 298 and 299: opening and photosynthesis relative
Page 300 and 301: that occur during the periods of fr
Page 302 and 303: The crop, where price can vary more
Page 304: Modify horticultural practicesPruni
Page 307 and 308: FIGURE 13Comparison of yield per un
Page 309 and 310: season. Thus the risks of salinity
Page 312: 4.1 Fruit trees and vinesEditor:Eli
Page 315 and 316: Figure 1 Production trends for oliv
Page 317 and 318: Figure 2Occurrence and duration of
Page 320 and 321: The use of displacement sensors to
Page 322 and 323: Figure 4 Relationship between relat
Page 324 and 325: Table 3 Sample calculation of month
Page 326 and 327: clayey soils. If supply is very lim
Page 329: Lead AuthorDavid A. Goldhamer(forme
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Fruit growth during this stage is t
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Season-long stressSeveral studies h
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Table 1Published monthly crop coeff
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Four crop-water-production function
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size distribution toward more favou
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Lead AuthorSAmos Naor(GRI, Universi
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Apples tend to have a biennial bear
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water stress and thus highly respon
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indicate that deficit irrigation ad
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Figure 7Effect of midday light inte
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Figure 10Response of marketable fru
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Failla, O., Zocchi, Z., Treccani, C
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Figure 1 Production trends for plum
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soil water. In young orchards, post
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Figure 3 Relationships between rela
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ReferencesAllen, R.G., Pereira, L.S
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Figure 1 Production trends for almo
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FIGURE 2The three stages of almond
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Figure 3Differences in the cultivar
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Indicators of tree water statusTo p
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nuts are rapidly expanding and late
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ReferencesAyars, J.E., Johnson, R.
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Table 2 (Continued)Year TreatmentWa
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Table 3 (continued)Potential900 mmA
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Figure 1 Production trends for pear
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(Elkins et al., 2007). The appearan
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out in Spain under more common grow
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Figure 4Relationships between the p
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Data in Figure 5 suggest that there
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e saved, but this causes a reductio
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pear 389
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Figure 1 Production trends for peac
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Figure 2bEvolution of vegetative (s
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The postharvest period is important
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the midday stem-water potential in
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PHOTOPeach leaf appearance under th
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FIGURE 5Relation between the crop c
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In applying RDI strategies an impor
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peach 407
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Figure 1 Production trends of walnu
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1 100 mm, a team in California appl
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Figure 1 Production trends for pist
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There are two types of shoot growth
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FIGURE 3Time course development of
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Stage III was the most stress sensi
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(see Chapter 4), as in other specie
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Table 2 Suggested RDI strategies fo
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Lead AuthorSCristos Xiloyannis(Univ
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is completed within 20 days; therea
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or peach. However, because fruit is
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to a midday value varying between -
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Lead AuthorRaúl Ferreyraand Gabrie
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The most critical developmental per
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Figure 4Effects of the level of app
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Lead AuthorJordi Marsal(IRTA, Lleid
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water stress should not be imposed
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Under certain growing conditions, s
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ReferencesAntunez A., Stockle, C. &
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Lead AuthorSVictor O. Sadras(SARDI
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Current season inflorescences becom
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the actual timing of each critical
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environments, rainfall pulses and l
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Figure 6Yield reduction with increa
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Table 3Yield and yield components o
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Figure 9Wine quality score as a fun
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Figure 11Wine attributes of Tempran
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(McCarthy and Coombe, 1999), but ev
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Figure 15Relative yield as a functi
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Shiraz, Grenache and Mourvèdre in
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Girona, J., Mata, M., del Campo, J.
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Lead AuthorSCristos Xiloyannis(Univ
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Figure 2Seasonal pattern of the lea
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Figure 5Fraction of the exposed and
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FIGURE 9Soil volume explored by roo
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Water Requirements and IrrigationMa
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5. EpilogueThis publication, Irriga
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operating systems (e.g., Linux, Uni
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Crop yield response to waterAbstrac
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