Study on greenhouse pepper optimal regulated deficit irrigation scheme based on AHP\|EWM\|TOPSIS
View Fulltext  View/Add Comment  Download reader
  
DOI:10.7606/j.issn.1000-7601.2023.01.14
Key Words: regulated deficit irrigation  pepper  drought  growth index  quality
Author NameAffiliation
ZHANG Zeyu College of Water Conservancy and Architectural EngineeringNorthwest A&F UniversityKey Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of EducationYanglingShaanxi 712100China 
CAO Hongxia College of Water Conservancy and Architectural EngineeringNorthwest A&F UniversityKey Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of EducationYanglingShaanxi 712100China 
HE Zijian College of Water Conservancy and Architectural EngineeringNorthwest A&F UniversityKey Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of EducationYanglingShaanxi 712100China 
PEI Shuyao College of Water Conservancy and Architectural EngineeringNorthwest A&F UniversityKey Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of EducationYanglingShaanxi 712100China 
LI Manning College of Water Conservancy and Architectural EngineeringNorthwest A&F UniversityKey Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of EducationYanglingShaanxi 712100China 
Hits: 404
Download times: 244
Abstract:
      Peppers are very sensitive to soil moisture. Traditional irrigation methods only aim at high yield with a large amount of irrigation water on the crop which resulting in high yield and low quality in peppers. To select the optimal regulated deficit irrigation scheme balancing between yield and quality, this study took pepper as the research object, with adequate water supply (75%~85%θf, θf is filed capacity) for the whole growth period as control (CK). Two kinds of deficit degree (mild RDI: 65%~75%θf and severe RDI: 55%~65%θf) and two kinds of deficit duration (short RDI: continuous deficit for four days and long RDI: continuous deficit for eight days) were set in three growth stages (seedling, flowering, and fruiting stage). The experimental results showed that, the plant height, stem diameter, leaf area and dry matter of vegetative organs of pepper were all reduced by regulated deficit irrigation at different growth stages. Compared with flowering and fruiting stage, water deficit at seedling stage inhibited growth indexes and dry matter of vegetative organs the most. Especially under the long\|term severe water deficit at seedling stage (MSS-8), the dry matter of vegetative organs was the least, which decreased by 27.85% compared with CK. In addition, moderate water deficit at seedling stage and flowering stage was beneficial to increase dry matter of reproductive organs and yield of pepper. Of which, short\|term mild water deficit at seedling stage (MLS-4), long\|term mild water deficit at seedling stage (MLS-8) and short\|term mild water deficit at flowering stage (HLS-4) increased dry matter of reproductive organs and yield of pepper to different degrees. Especially under the treatment of MLS-8, the dry matter of reproductive organs and yield was the most, which increased by 17.60% and 17.01%, compared with CK. However, the dry matter of reproductive organs and yield were decreased in different intensity of water deficit at fruit stage. In the long\|term severe water deficit at fruiting stage (GSS-8), the dry matter of reproductive organs and yield were the least, which were decreased by 43.88% and 41.56% compared with CK, respectively. In addition, water deficit at seedling stage can reduce fruit quality, while water deficit at flowering and fruiting stage can promote pepper quality. Among them, VC content, fruit color index and capsaicin increased the most under GSS-8 treatment, which increased by 7.50%, 5.71% and 10.30% compared with CK, respectively. Based on comprehensive reflection of the decision makers preference and objective test results and a more scientific and comprehensive method of selecting the optimal regulated deficit irrigation scheme, the AHP-EWM-TOPSIS multi\|target comprehensive analysis method was used to score regulated deficit irrigation schemes. It found that the short\|term mild water deficit scheme at flowering stage (HLS-4) possessed the highest score for improving the production and quality most. Therefore, HLS-4 scheme was the best deficit scheme in this experiment.