الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
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SUMMARY
Two field experiments were conducted at the experimental field of Agric. Res.
Center, Giza, Egypt during 1992/93 and 1993/94 seasons. The aim of the
experiments was to study the effect of scheduling irrigation offaba bean according
to the class A pan evaporation records under three sowing dates on growth, yield
components, seed yield and crop water use. The experiments were carried out in a
clay loamy soil. Faba bean variety was Giza 402.
The design of the experiments was split plot with four replications. Main plots
were devoted for planting dates and sub plots for irrigation regimes. Two more
replicates were devoted for the randomly selected plant samples of 60 days old.
The sub plot area was ’21 m2 (1/200 feddan). The three planting dates were: 1.
early on November 5,2. moderate on November 20 and 3. late on December 5.
The applied irrigation regimes were:
1. Irrigation at 0.8 accumulative pan evaporation.
2. Irrigation at 1.0 accumulative pan evaporation.
3. Irrigation at 1.2 accumulative pan evaporation.
All cultural practices for growing faba bean crop were carried out as
recommended.
The irrigation treatments were applied after the first irrigation ”Mohaya” till the
end of the growing season. Data of the effect of experimental treatments were
collected on the following characters:
1. Plant height, number of leaves/plant, number of branches/plant and dry
weight/plant at 60 days from planting as well as at harvest.
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2. Yield components including number of pods/plant, number of seeds/pod
and weight of 100 seeds.
3. Seed yield in kg/feddan.
4. Actual consumptive use (ETa).
5. Potential evapotranspiration (ETp).
6. Crop coefficients (Kc).
7. Water use efficiency (W.D.E.)
Results could be summarized as follows
L Effect of planting date:
1. Plant height at 60 days from planting significantly increased by early
planting in both seasons.
Also at harvest, early planting significantly increased plant height in the
second season. Increase in plant height due to early planting in the first
season was below the level of significance.
2. Number ofleaves/plant at 60 days from planting significantly increased in
early planting compared with late planting in both seasons.
At harvest, the effect of sowing date on number of leaves/plant was
significant in the first season only, where a significant increase was
recorded due to early planting.
3. Number of branches/plant after 60 days from planting was not
significantly influenced by sowing date in the two seasons.
At harvest. early planting of faba bean caused a significant increase in
number of branches/plant in the second season only.
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4. Dry weight per plant of faba bean significantly increased after 60 days
from planting as well as at harvest as a result of early planting in both
seasons.
The increase in plant dry weight reached the 1% level of significance in
both seasons and at early stage and at harvest as well.
5. Number of pods/plant was significantly affected by planting date in both
seasons where a marked increase was recorded in early planting. Similarly,
number of seeds/pod showed the same trend in both seasons.
6. Weight of 100 seeds was significantly affected by planting date only in the
first season.
Intermediate plantings date on November 20 produced the highest value
of seed index in both seasons.
7. Seed yield per faba bean plant increased with early planting compared
with moderate and late plantings. This increase reached the level of
significance in the first season.
8. Seed yield per feddan of faba bean was significantly influenced by planting
date in both seasons.
In 1992/93 season, early planting on November 5 increased seed
yield/feddan by 8.05 and 60.67% compared with moderate and late
planting date, respectively.
In 1993/94 season, the corresponding increase due to early planting was
26.93 and 115.34%, compared with moderate and late planting,
respectively.
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ll. Effect of irrigation regime
1. Irrigation regimes significantly affected plant height offaba bean at 60
days from planting in both seasons. However, the proposed number of
irrigations was not applied at that stage of growth. Scheduling irrigation
according to 1.2 accumulative pan evaporation records significantly
increased plant height compared with irrigation at 1.0 and 0.8 records.
2. Similarly, plant height at harvest was increased due to irrigation at 1.2 pan
evaporation records. The increases due to irrigation regimes at harvest
reached the significance level only in the first season.
3. Number of leaves/plant after 60 days from planting as well as at harvest
showed marked and significant increase as a result for scheduling
irrigation at 1.2 accumulative class A pan evaporation records in both
seasons.
4. Number of branches/plant after 60 days from planting was not
significantly affected by irrigation treatments in both seasons.
On the other hand, a significant effect of irrigation regime on number of
branches/plant was recorded at harvest in both seasons. Irrigation at 1.2
accumulative pan evaporation significantly increased this trait compared
with irrigation at 0.8 accumulative records.
5. Dry weight/plant after 60 days from planting was significantly affected by
irrigation regime in the first season where a marked increase in plant dry
weight was recorded by scheduling irrigation at 1.2 accumulative pan
evaporation.
6. Dry weight/plant at harvest significantly responded to irrigation at 12
accumulative records where marked and highly significant increases were
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obtained compared with irrigation at 1.0 and 0.8 accumulative pan
evaporation records.
7. Number of pods/plant, number of seeds/pod, seed index and seed
yield/plant increased in both seasons when irrigation was scheduled at 1.2
accumulative pan evaporation records.
The increases in these characters were significant except with number of
seeds per pod in 19993/94 season.
8. Seed yield offaba bean/fed. was significantly affected by irrigation regime
in both seasons.
In 1992/93, scheduling irrigation at 1.2 class A pan evaporation records
increased seed yield by 29.30 and 51.37% compared with irrigation at 1.0
and 0.8 levels, respectively. In 1993/94 season, the corresponding
increases were 11.29 and 83.19%, respectively.
II. Interaction effects:
1. The interaction between planting date and irrigation regimes significantly
affected dry weight per plant at 60 days from planting and at harvest and
seed index in both seasons.
2. AIl other studied characters were not significantly influenced by planting
date X irrigation regime in both seasons.
IV. Soil water-relations:
I. The average values of seasonal evapotranspiration by faba bean averaged
over the three sowing dates and the three irrigation regimes were 358.2
and 376.6 mm in the first and second season, respectively
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2. The seasonal actual values of evapotranspiration in 1992/93 were 387.07,
359.57 and 327.97 mm for early (November 5), intermediate (November
20) and late (December 5) planting date, respectively.
In 1993/94, the corresponding values of seasonal ETa offaba bean were
406.40, 376.30 and 347.10 mm for early, intermediate and late planting,
respectively.
3. The average values of seasonal evapotranspiration 10 1992/93 were
334.47, 354.73 and 385.40 mm for irrigating faba bean at 0.8, 1.0 and 1.2
accumulative pan evaporation records, respectively.
In 1993/94, the corresponding values of seasonal evapotranspiration were
353.47, 372:60 and 403.73 mm for irrigating faba bean at 0.8, 1.0 and 1.2
accumulative pan evaporation records, respectively.
4. The average values of crops coefficient (Kc) for faba bean in 1992/93
season (estimated by class A pan evaporation) were 0.87,0.75 and 0.66
for early, intermediate and late planting date, respectively.
In 19993/94 season, the corresponding crop coefficient values were 0.73,
0.66 and 0.59 for early, intermediate, and late planting. respectively.
5. The average values of water use efficiency by faba bean 1992/93 season
were 0.90, 0.75 and 0.71 kg seeds/me of water consumed for early,
intermediate and late planting date. respectively.
The corresponding values of water use efficiency in 1993/94 season were
0.57, 0.55 and 0.37 kg seeds/m’ of water consumed for early,
intermediate and late planting, respectively.
6. The average values of water use efficiency in 1992/93 season were 0.87,
0.96 and 0.53 kg seeds/m” of water consumed for 0.8. 1.0 and 1.2
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accumulative pan evaporation, respectively. The corresponding values in
1993/94 season were 0.55.0.66 and 0.28.
7. It could be concluded that from the point of view of water economy.
sowing faba bean early (November 5) and scheduling irrigation at LO
accumulative pan evaporation is recommended.