Research progress on effects of regulated deficit irrigation on seeds-production maize under mulched drip irrigation in Hexi Oasis

2021 ◽  
Author(s):  
chao liang ◽  
hengjia zhang ◽  
zeyi wang ◽  
sanli zhou
Keyword(s):  
Drip Irrigation ◽  
Deficit Irrigation ◽  
Research Progress ◽  
Regulated Deficit Irrigation ◽  
Mulched Drip Irrigation

scholarly journals Influence of Regulated Drip Irrigation on Productivity and Physicochemical Traits of Tomato ‘Tofane’ under Hot Desert Climate

2020 ◽  
Vol 28 (1) ◽  
pp. 93-100
Author(s):  
Chenafi Azzeddine ◽  
Bachir Bey Mostapha ◽  
Chennafi Houria
Keyword(s):  
Water Content ◽  
Fruit Quality ◽  
Drip Irrigation ◽  
Deficit Irrigation ◽  
Titratable Acidity ◽  
Fruit Weight ◽  
Soluble Solids ◽  
Stage Iii ◽  
Regulated Deficit Irrigation ◽  
Desert Climate

AbstractThe impact of regulated drip-irrigation on productivity and fruit quality of tomato ‘Tofane’ has been studied under a warm dry desert climate in southern Algeria. Yield, fruit weight and size, water content and parameters of fruit quality – total soluble solids, phenolic compounds, carotenoids, vitamin C, pH and titratable acidity were determined. Two irrigation treatments were applied in 2012 and 2013: T1, optimal irrigation (100% evapotranspiration – ETc) during the whole growth period (growth stages I, II and III); T2, optimal irrigation during I and II stages, and regulated deficit irrigation (67% ETc) during stage III (from fruit set to full fruit maturity of first and second bunch). T1 treatment during the whole season showed the highest values of soil water potential (Ψsoil), between −0.02 MPa and −0.06 MPa, on depths of 0.3 and 0.6 m, respectively. During stage III, regulated deficit irrigation caused the lowest Ψsoil values, which were between −0.1 MPa and −0.12 MPa on a soil depth of 0.3 and 0.6 m, respectively. Deficit irrigation caused significant decrease of water content in fruits and not significant decrease of fruit weight and size, as well as fruit yield while water saving for irrigation amounted to 10%. Comfort-irrigated tomato plants produced fruits containing significantly higher titratable acidity, total soluble solids and vit. C content. There was a tendency to decrease carotenoid content and increase phenolic content in both years of the study. Due to the possibility of water saving with not significant yield decrease, it seems that the reduction of water use in growth stage III would be an adequate strategy for tomato cultivation in hot, dry climate.

scholarly journals Integrated Evaluation of the Water Deficit Irrigation Scheme of Indigowoad Root under Mulched Drip Irrigation in Arid Regions of Northwest China Based on the Improved TOPSIS Method

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1532
Author(s):  
Zeyi Wang ◽  
Hengjia Zhang ◽  
Yucai Wang ◽  
Chenli Zhou
Keyword(s):  
Water Deficit ◽  
Drip Irrigation ◽  
Deficit Irrigation ◽  
Comprehensive Evaluation ◽  
Water Productivity ◽  
Northwest China ◽  
High Yield ◽  
Water Control ◽  
Entropy Weight ◽  
Mulched Drip Irrigation

Limited water resources and low water productivity limit the sustainable development of agriculture in northwest China. In this study, drip irrigation under plastic film was used to achieve an optimal water deficit irrigation (WDI) scheme for the cultivation of indigowoad root (Isatis tinctoria L.). Field water control experiments were conducted in 2016 and 2017. Evaluation of WDI schemes was carried out by considering five indices: water consumption, yield, water use efficiency (WUE), indigo, and (R,S)-goitrin. To enhance the reliability of results, the analytic hierarchy process (AHP) and entropy weight method (EWM) were adopted to calculate the combined weight of the evaluation index. Finally, an improved technique for order of preference by similarity to ideal solution (TOPSIS) that integrated AHP–EWM weights was used to construct a unified, comprehensive evaluation model of indigowoad root under mulched drip irrigation that would produce high yield while saving water. The evaluation results indicated that mild WD (specifically, the V1G1 treatment) was continuously exerted during the vegetative and fleshy root growth periods, which enhanced the WUE and improved the quality of indigowoad root to a certain extent without significantly reducing the yield. These results provide a scientific basis for irrigation of indigowoad in northwest China and other areas with a similar environment.

scholarly journals Evapotranspiration and Quantitative Partitioning of Spring Maize with Drip Irrigation under Mulch in an Arid Region of Northwestern China

Water ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3169
Author(s):  
Chenggong Xuan ◽  
Risheng Ding ◽  
Jie Shao ◽  
Yanshuo Liu
Keyword(s):  
Drip Irrigation ◽  
Arid Region ◽  
Deficit Irrigation ◽  
Crop Coefficient ◽  
Northwestern China ◽  
Growth Stages ◽  
Regulated Deficit Irrigation ◽  
Dynamic Variations ◽  
Spring Maize ◽  
Vegetative And Reproductive Growth

To examine evapotranspiration (ETc), soil evaporation (Es), and transpiration (Tr), and partitioning of ETc, a two-year field experiment was carried out in a maize field with drip irrigation under mulch in an arid region of northwestern China in 2017 and 2018. In the experiment we designed two treatments with full irrigation (T1) and growth stage-based strategic regulated deficit irrigation (T2). The applied irrigation of T2 was 40% of the T1 during both late vegetative and reproductive growth stages. Based on the measurements of soil water content (SWC) and Tr, a dual crop coefficient model (SIMDualKc) was calibrated and validated, and daily ETc, Es, and Tr were estimated. The model can simulate well the dynamic variations of SWC and Tr. The calibrated basic crop coefficient at the initial, mid-season, and end growth stages was 0.2, 1.15, and 0.75, respectively. The ETc was 507.9 and 519.1 mm for the T1 treatment, and 428.9 and 430.9 mm for the T2 treatment. The ratios of Tr to ETc were higher for the two treatments, ~90%, for two years. Collectively, both drip irrigation under mulch and strategic deficit irrigation after canopy covering of the ground can significantly reduce the ineffective proportion of ETc and Es.

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