Manejo e viabilidade econômica da irrigação por gotejamento na cultura da cebola

Content Provider	Semantic Scholar
Author	Bôas, Vilas Carvalho, Renato
Copyright Year	2014
Abstract	VILAS BOAS, Renato Carvalho. Drip irrigation management and economic viability on onion crop. 2010. 114 p. Thesis (Doctorate in Agricultural Engineering/Engineering of Water and Soil) – Federal University of Lavras, Lavras, MG. This study aimed to asses the effect of different water tensions in soil over the development, production and postharvest conservation of two onion cultivars irrigated by drip system, as well, to estimate the economic viability of this irrigation system. The experiment was conduced in open field beds at the experimental area on the Agriculture Department at the Federal University of Lavras (UFLA), Horticulture sector, from June to October 2008. The experimental design used was the randomized block design in factorial scheme 2 x 6, with four repetitions. The treatments were two onion cultivars, the hybrid Optima F1 and the non hybrid Alfa Tropical and six soil water tensions, i.e., 15, 25, 35, 45, 60 and 75 kPa. The results allowed to conclude the hybrid Optima F1 presented best responses regarding the following analyzed characteristics: total bulb yield, commercial bulb yield, average mass of commercial bulbs, water use efficiency and loss in bulb mass; the plant height and the hypocotyls diameter presented decrescent linear response as the water tensions were increased, for both cultivars; in both cultivars, in order to achieve taller plants, higher bulb yields (total and commercial), higher percentage of classes 3 and 4 bulbs, and higher average mass of commercial bulbs, the irrigation must be applied when the soil water tensions is around 15 kPa at 0.15 m depth; the total solids content presented a quadratic response regarding to the water soil tensions, and the maximum value, obtained at the tension of 29.8 kPa; there were no responses to the dry matter content of commercial bulbs related to the water tensions applied to the soil; the water use efficiency augmented linearly regarding to an increase of the water soil tension; the loss in bulb mass showed a crescent linear trend related to increase of days after maturation, and the hybrid Optima F1 presented lower losses during the storage period; the average total costs were inversely proportional to the yield of the soil water tension treatments, for both cultivars, indicating a response related to the production scale; the recommendation is to adopt the tension of 15 kPa as the moment for irrigation, along with the hybrid cultivar Optima F1, for higher incomes in the onion production; the drip irrigation on onion crop adopting the soil water tensions and the cultivars used in this study, is economically viable. _ Guidance Committee: Geraldo Magela Pereira – UFLA (Major Professor), Rovilson Jose de Souza – UFLA and Ricardo Pereira Reis – UFLA.
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Alternate Webpage(s)	http://repositorio.ufla.br/jspui/bitstream/1/3567/1/TESE_Manejo%20e%20viabilidade%20econ%C3%B4mica%20da%20irriga%C3%A7%C3%A3o%20por%20gotejamento%20na%20cultura%20da%20cebola.pdf
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Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article