I - --ii

144
Table 2
Canopy development and drymatter production of winter-sown chickpeas, 1980-81.
Maximum I Maximum I Above
Site Green Area Ground Drymatter DMP + GAI
Index Production
(GAI) (DMP t/ha)
Jindiress
ILC 482 4.7 7.9 1.69
ILC 72 4.4 7.2 1.64
ILC 72 (Dense 2) 5.4 9.1 1.68
= 1.61
Tel Hadya
1LC 482 2.6 3.6 1.38
ILC 72 1.9 3.3 1.74
ILC 72 (Dense 2) 3.0 4.7 1.56
= 1.56
Brida
ILC 482 1.7 2.5 1.47
ILC 72 1.3 1.9 1.46
ILC 72 (Dense 2 ) 1.9 2.7 1.42
1. Values extracted from curves fitted by hand.
2. Stand density approximately 600,000 plants/ha.
Evapotranspiration and Water-Use Efficiency
= 1.45
Accumulated moisture use data are presented in Table 3 for all treatments at the
three sites. Accumulated pan evaporation (Eo) and rainfall are also presented.
Total E, between germination and maturity (95% crop yellowing) is calculated,
and utilizing final harvest data the water-use efficiencies (WUE) are given for
each treatment for boLh total biological yield and seed yield.
All treatments (at a given site) had very simliar accumulated E, values from
germination through until early March. This includes the spring-sown ILC 482
crop which until mid-March (75% emergence) could effectively be considered as
weed-free fallow plots. This similarity of Et of winter-planted crops compared
with evaporation from a bare soil (E.) during the cool winter months has also
been noted for other crops (e.g. wheat, barley, lentils, faba beans). During the
winter, when crop leaf areas are low and the soil surface is frequently rewetted,
E. is the dominant component of E, and it is only in spring, when crop leaf area in­