Errata FAO-56: 'Crop evapotranspiration'

FAO-56: Crop Evapotranspiration -- Errata

Page

Situation

Errata

viii Missing in table of contents Air temperature ...     Page 32

xxv SW missing Soil water content [mm]

xxii Conflict of units in 'List of principal symbols and acronyms' - Eq. (2)
note that ET, CR are in mm day-1

I, P, RO, DP, SF, SW are in mm.

Note that ET is expressed in mm when used in equations with these terms, but it is expressed in mm/day when used in many other equations. The reader should distinguish the proper time unit.

20 line 6 from bottom should read "resistance to vapour"

39 Example 5, second line from bottom The Eq. 17 is missing a '2' in denominator

45 Table 3, last column Change 0.035 to 0.0353 (more precision for conversion)

54 Eq. (41) - sign (difference of temperature) instead of + sign

75 Box Example 19, line 3 eliminate the word "average"

99 last line delete the space between "d" and "escribing"

110 footnote 1 of Table 12 add: "If not listed, use the K_{c ini} value for the crop category"

121 Illustration of the climatic effect -- last sentence As an example, expected variations for K_{c mid} for ~~tomatoes~~ wheat in response to ... in Box 14

149 (below Table 20) rules to determine f_w
replace the first bullet with the following two bullets:

Surface is wetted by irrigation and insignificant rain (< 3 to 4 mm): f_w is f_w for the irrigation system
Surface is wetted by irrigation and significant rain (> 3 to 4 mm): f_w is 1.0 (precipitation)

154 -155 Example 35 Calculation for E and K_c on day 3 were incorrect and this influenced calculations for subsequent days. Also, rounding of D_e,i between days (to mimic hand calculations) in the original example has been changed to exact calculations using a spreadsheet. A new Example 35 is contained as an errata.

167 Figure 42 -- caption of X-as (at the bottom) is missing D_r: root zone depletion

172 - 173 Example 38 The recalculation for E and K_c in the errata for Example 35 has required change for Example 38 as well. A new Example 38 is contained as an errata.

186

187

Eq. (97)

Eq. (98)

~~K_{cb mid}~~ ® K_{cb mid adj} = estimated basal K_cb during the mid-season when plant density and/or leaf area ...

idem

188 Box 18 - last part Where j : latitude [rad] (negative for southern latitudes)            (Eq. 22)

213

214

Table 2.1 First column Z

idem
Z ® z

224 Eq. (3-8) change 0.611 to 0.6108 to be compatible with eqn. 11 (R.Allen, 2/2001)

226 Eq. (3-14) -0.0018 P ® -0.0021 P     (this may require an explanatory footnote)

226
List of parameters of Eq. (3-14)

K_t turbidity coefficient [], 0 < K_t £1.0 where K_t = 1.0 for clean air and Kt = 1.0 for extremely trubid, dusty or polluted air
K_t = 1.0 ® K_t » 0.5

227
First line of Equation (3-20)

K_D = 0.35 – 0.33 K_B   for K_B £ 0.15

K_D = 0.35 - 0.36 K_B   for K_B £ 0.15

(i.e., 0.33 ® 0.36)   (this may require an explanatory footnote)

267
In section on Equations for figures 29 and 30 of Chapter 6. All occurrences where "Equation 3" is mentioned

All occurrences of "Equation 3" should be changed to "Equation 7-3"

  268 Example 7-1 of Annex 7: Application of Eq. 7-3 to Example 25 Calculation from equation is incorrect. Change four occurrences of "0.57" to "0.53" . Change two occurrences of "0.63" to "0.61" and change final answer from "3.2 mm/day" to "3.0 mm/day".

Page	Situation	Errata
viii	Missing in table of contents	Air temperature ... Page 32
xxv	SW missing	Soil water content [mm]
xxii	Conflict of units in 'List of principal symbols and acronyms' - Eq. (2)	note that ET, CR are in mm day-1 I, P, RO, DP, SF, SW are in mm. Note that ET is expressed in mm when used in equations with these terms, but it is expressed in mm/day when used in many other equations. The reader should distinguish the proper time unit.
20	line 6 from bottom	should read "resistance to vapour"
39	Example 5, second line from bottom	The Eq. 17 is missing a '2' in denominator
45	Table 3, last column	Change 0.035 to 0.0353 (more precision for conversion)
54	Eq. (41)	- sign (difference of temperature) instead of + sign
75	Box Example 19, line 3	eliminate the word "average"
99	last line	delete the space between "d" and "escribing"
110	footnote 1 of Table 12	add: "If not listed, use the K_{c ini} value for the crop category"
121	Illustration of the climatic effect -- last sentence	As an example, expected variations for K_{c mid} for ~~tomatoes~~ wheat in response to ... in Box 14
149	(below Table 20) rules to determine f_w	replace the first bullet with the following two bullets: Surface is wetted by irrigation and insignificant rain (< 3 to 4 mm): f_w is f_w for the irrigation system Surface is wetted by irrigation and significant rain (> 3 to 4 mm): f_w is 1.0 (precipitation)
154 -155	Example 35	Calculation for E and K_c on day 3 were incorrect and this influenced calculations for subsequent days. Also, rounding of D_e,i between days (to mimic hand calculations) in the original example has been changed to exact calculations using a spreadsheet. A new Example 35 is contained as an errata.
167	Figure 42 -- caption of X-as (at the bottom) is missing	D_r: root zone depletion
172 - 173	Example 38	The recalculation for E and K_c in the errata for Example 35 has required change for Example 38 as well. A new Example 38 is contained as an errata.
186 187	Eq. (97) Eq. (98)	~~K_{cb mid}~~ ® K_{cb mid adj} = estimated basal K_cb during the mid-season when plant density and/or leaf area ... idem
188	Box 18 - last part	Where j : latitude [rad] (negative for southern latitudes) (Eq. 22)
213 214	Table 2.1 First column Z idem	Z ® z
224	Eq. (3-8)	change 0.611 to 0.6108 to be compatible with eqn. 11 (R.Allen, 2/2001)
226	Eq. (3-14)	-0.0018 P ® -0.0021 P (this may require an explanatory footnote)
226	List of parameters of Eq. (3-14) K_t turbidity coefficient [], 0 < K_t £1.0 where K_t = 1.0 for clean air and Kt = 1.0 for extremely trubid, dusty or polluted air	K_t = 1.0 ® K_t » 0.5
227	First line of Equation (3-20) K_D = 0.35 – 0.33 K_B for K_B £ 0.15	K_D = 0.35 - 0.36 K_B for K_B £ 0.15 (i.e., 0.33 ® 0.36) (this may require an explanatory footnote)
267	In section on Equations for figures 29 and 30 of Chapter 6. All occurrences where "Equation 3" is mentioned	All occurrences of "Equation 3" should be changed to "Equation 7-3"
268	Example 7-1 of Annex 7: Application of Eq. 7-3 to Example 25	Calculation from equation is incorrect. Change four occurrences of "0.57" to "0.53" . Change two occurrences of "0.63" to "0.61" and change final answer from "3.2 mm/day" to "3.0 mm/day".