Agriculture Reference
In-Depth Information
Fig. 6.16.
Responses of bulb onion yields to irrigation. (a) The effect the soil water
potential maintained at a depth of 0.2 m on the total bulb yield, the yield of
'Colossal' grade (> 102 mm diameter) bulbs and the yield of bulbs rotting in storage
by 15 December for onions grown using drip fertigation in the Treasure Valley of
eastern Oregon, USA (from Shock
et al
., 2000. Courtesy of
HortScience
). (b) The
response of bulb yield and Leaf Area Index (LAI) to irrigation for onions grown at a
density of 25 plants/m
2
at Albacete, Castilla-La Mancha, Spain. The treatments T
0
,
T
1
, T
2
, T
3
, T
4
and T
5
, respectively received irrigation equal to 20, 40, 60, 80, 100
and 120% of the crop evapotranspiration, ET
C
, calculated on the basis of Eqn 6.8
(see text) (from Martin de Santa Olalla
et al
., 1994).
