EVALUATION OF SELECTED CROP – YIELD WATER USE MODELS FOR TOMATO (LYCOPERSICON
EVALUATION OF SELECTED CROP – YIELD WATER USE MODELS FOR TOMATO (LYCOPERSICON
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Date
2009-01
Authors
EMMANUEL, SUNDAY OLORUNAIYE
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Abstract
Two crop yield models, Jensen (1968) and Bras and Codova (1981), multiplicative
and additive models respectfully were evaluated by developing a relationship between
crop yields and seasonal evapotranspiration for tomato in Kaduna, Nigeria, under
conditions of moisture stress caused by evapotranspiration deficits at three growth
stages. Tomato (lycopersicon esculentum) TI539 variety was planted in the Kaduna
Polytechnic farm, Nariya, Kaduna during the 2005/2006 irrigation season.
Evapotranspiration deficits were created by withholding irrigation 3,5 and 7days in
excess of the regular 7-days irrigation interval at each of the three stages of growth
considered. The stress sensitivity factors for the two models were estimated for the
three growth stages studied and their accuracy and predictability of crop yields were
also tested. The result showed that strong linear relationships exist between fruit yield
and seasonal evapotranspiration within the limits tested. A seasonal evapotranspiration
of between 530 and 460mm was observed with a corresponding fruit yield of between
20 – 43t/ha. The two crop yield models evaluated were found to have adequately
predicted crop yield with Jensen (1968) giving a better prediction. It was also found
from the stress sensitivity factor determined that moisture stress at the vegetative
growth stage of tomato will significantly reduce fruit yield
Description
A THESIS SUBMITTED TO THE POST GRADUATE SCHOOL IN PARTIAL
FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF THE
DEGREE OF MASTER OF SCIENCE IN AGRICULTURAL ENGINEERING
DEPARTMENT OF AGRICULTURAL ENGINEERING
FACULTY OF ENGINEERING
AHMADU BELLO UNIVERSITY
ZARIA.
JANUARY, 2009
Keywords
EVALUATION, SELECTED, CROP, YIELD WATER, USE, MODELS, TOMATO, (LYCOPERSICON