数字农科院2.0

Deficit irrigation based on drought tolerance and root signalling in potatoes and tomatoes

文献类型： 外文期刊

作者： Jensen, Christian R.;Liu, Fulai;Jacobsen, Sven-Erik;Plauborg, Finn;Andersen, Mathias N.;Psarras, Georgios;Chartzoulakis, Kostas;Janowiak, Franciszek;Stikic, Radmila;Jovanovic, Zorica;Li, Guitong;Qi, Xuebin

作者机构：

关键词： ABA modelling;Antioxidants;Drip irrigation;Partial root zone drying;Processing tomatoes;Quality;Soil nitrogen

期刊名称： AGRICULTURAL WATER MANAGEMENT

ISSN： 0378-3774

年卷期： 2010 年 98 卷 3 期

页码：

收录情况： SCI

摘要： Agriculture is a big consumer of fresh water in competition with other sectors of the society. Within the EU-project SAFIR new water-saving irrigation strategies were developed based on pot, semi-field and field experiments with potatoes (Solanum tuberosum L), fresh tomatoes (Lycopersicon esculentum Mill.) and processing tomatoes as model plants. From the pot and semi-field experiments an ABA production model was developed for potatoes to optimize the ABA signalling; this was obtained by modelling the optimal level of soil drying for ABA production before re-irrigation in a crop growth model. The field irrigation guidelines were developed under temperate (Denmark), Mediterranean (Greece, Italy) and continental (Serbia. China) climatic conditions during summer. The field investigations on processing tomatoes were undertaken only in the Po valley (North Italy) on fine, textured soil. The investigations from several studies showed that gradual soil drying imposed by deficit irrigation (DI) or partial root zone drying irrigation (PRO) induced hydraulic and chemical signals from the root system resulting in partial stomatal closure, an increase in photosynthetic water use efficiency, and a slight reduction in top vegetative growth. Further PRD increased N-mineralization significantly beyond that from DI, causing a stay-green effect late in the growing season. In field potato and tomato experiments the water-saving irrigation strategies DI and PRD were able to save about 20-30% of the water used in fully irrigated plants. PRO increased marketable yield in potatoes significantly by 15% due to improved tuber size distribution. PRO increased antioxidant content significantly by approximately 10% in both potatoes and fresh tomatoes. Under a high temperature regime, full irrigation (FI) should be undertaken, as was clear from field observations in tomatoes. For tomatoes full irrigation should be undertaken for cooling effects when the night/day average temperature >26.5 degrees C or when air temperature >40 degrees C to avoid flower-dropping. The temperature threshold for potatoes is not clear. From three-year field drip irrigation experiments we found that under the establishment phase, both potatoes and tomatoes should be fully irrigated; however, during the later phases deficit irrigation might be applied as outlined below without causing significant yield reduction: Potatoes After the end of tuber initiation, DI or PRO is applied at 70% of FI. During the last 14 days of the growth period, DI or PRO is applied at 50% of FI. Fresh tomatoes From the moment the 1st truce is developed, DI is applied at 85-80% of FI for two weeks. In the middle period, DI or PRD is applied at 70% of FI. During the last 14 days of the growth period, DI or PRD is applied at 50% of FI. Processing tomatoes From transplanting to fruit setting at 4th-5th cluster, the PRO and DI threshold for re-irrigation is when the plant-available soil water content (ASWC) equals 0.7 (soil water potential, Psi(soil) = -90 kPa). During the late fruit development/ripening stage, 10% of red fruits, the threshold for re-irrigation for DI is when ASWC= 0.5 (Psi(soil) = -185 kPa) and for PRD when ASWC (dry side) = 0.4 (Psi(soil). dry side = -270 kPa). The findings during the SAFIR project might be used as a framework for implementing water-saving deficit irrigation under different local soil and climatic conditions. (C) 2010 Elsevier B.V. All rights reserved.

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