| Study on crop-pan coefficient of greenhouse tomato under non-pressure irrigation |
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| DOI：10.7606/j.issn.1000-7601.2009.04.03 |
| Key Words: non-pressure irrigation crop-pan coefficient yield quality irrigation water use efficiency |
| Author Name | Affiliation | | ZHAO Weixia | Key Laboratory of Agricultural Soil & Water Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China | | CAI Huanjie | Key Laboratory of Agricultural Soil & Water Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China | | SHAN ZhiJie | Institute of Soil and Water Conservation, CAS, Yangling, Shaanxi 712100, China | | CHEN Xinming | Key Laboratory of Agricultural Soil & Water Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China | | WANG Jian | Key Laboratory of Agricultural Soil & Water Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Crop-pan coefficientis the ratio between crop water consumption and pan evaporation. Using -25 kPa as the soil water potential threshold, and designing six treatments for crop-pan coefficient Kcp=0.2, 0.4, 0.6, 0.8, 1.0, 1.2, study was made on tomato yield, quality and irrigation water use efficiency under different irrigation water amount. The crop-pan coefficient which acquired highest economic effectiveness was studied through the economic effectiveness analysis, wh
ile the measurement character of soil water potential using tensiometers was studied through the tensiometer reading. The results indicated that when Kcp values was from 0.2 to 0.8, the irrigation water amount had no influence on tomato yield, but when Kcp values was from 1.0 to 1.2, the irrigation water amount had significant effect on tomato yield. When Kcp value was 0.2, the irrigation water use efficiency was improved significantly. After considering water price, tomato using aim and market price in Yangling district, there was the highest economic effectiveness when Kcp was 1.2. The hysteresis quality of irrigation water amount calculation using crop-pan coefficient and the b
uried position of tensiometer were main factors to estimate the validity of tensiometer measuring the soil water potential threshold. |
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