Crop coefficient and evaptranspiration of onion at Awash Melkassa, Central Rift Valley of Ethiopia

被引：13

作者：

Meki Agricultural Office, Meki-Zeway, Ethiopia ^{[1
]}

不详 ^{[2
]}

不详 ^{[3
]}

不详 ^{[4
]}

机构：

[1] Meki Agricultural Office, Meki-Zeway

[2] Haramaya University, Haramaya

[3] Awash Melkassa Agricultural Research Center, Nazareth

[4] School of Agricultural and Wine Sciences, Charles Sturt University, Wagga Wagga, NSW 2678

来源：

Irrig. Drain. Syst. | 2009年 / 1卷 / 1-10期

关键词：

Awash Melkassa; Crop coefficient; Ethiopia; Lysimeter; Onion;

D O I：

10.1007/s10795-009-9059-9

中图分类号：

学科分类号：

摘要：

Improved water management through precise crop water requirement determination is needed to improve the efficiency of water use in agricultural production. As a result, appropriate irrigation scheduling which can lead to water saving, improvements in the yield and income can be designed. In this study, three non-weighing lysimeters having dimensions of 2 m × 1 m × 2 m were used to determine water requirement (ETc) and crop coefficient (Kc) of onion (Bombay Red cultivar). Reference crop evapotranspiration (ETo) was determined using weather data recorded at the site. The measured ETc values were 51.3 mm, 140.5 mm, 144.8 mm, and 53.9 mm during the initial, development, mid-season and late season growth stages respectively. Crop coefficient (Kc) values, calculated as ratio of ETc to ETo, were 0.47, 0.99, and 0.46 during the initial and mid-season stages and end of late season. Furthermore, third-order polynomials were fitted well to predict the crop coefficient values as functions of growing degree-days (GDD). © Springer Science+Business Media B.V. 2009.

引用

页码：1 / 10

页数：9

共 8 条

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[5] Hanson B.R., May D.M., New crop coefficient developed for high-yield processing tomatoes, Calif Agric, 60, 2, pp. 95-99, (2006)
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[7] Dessalegn L., Aklilu S., Research Experience in Onion Production, (2003)
[8] Sepaskhah A.R., Andam M., Crop coefficients of sesame in semi-arid region of I.R. Iran, Agricultural Water Management, 49, pp. 51-63, (2001)

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