Regulating Effects of Sprinkling Irrigation Using Brackish and Fresh Mixed Water on Root Distribution,Photosynthetic Characteristics and Yield of Summer Maize

doi:10.7668/hbnxb.20194974

Abstract

Abstract:

It is of great significance to study the effects of brackish water sprinkler irrigation on the growth and yield of summer maize to alleviate the shortage of fresh water resources,promote the utilization of unconventional water resources and guarantee the production of summer maize.Field trial was conducted for two consecutive years in the central plain area of the Heilonggang Basin,Hebei Province.It aimed to investigate the effects of three sprinkler irrigation treatments(fresh water,2 g/L brackish water,and 3 g/L brackish water)on root distribution,photosynthetic performance,and grain yield in summer maize.Results showed that the average dry root weight density of 0-60 cm soil layer in the whole growth period of 2 g/L brackish water sprinkler irrigation was reduced by 7%-9% than fresh water irrigation but with no significant difference,and the average root dry weight density of 3 g/L brackish water sprinkler irrigation was significantly reduced by 19%-26%.Compared with fresh water irrigation,the 2,3 g/L brackish water sprinkler irrigation both had adverse effects on the photosynthetic characteristics of leaves,especially the 3 g/L brackish water sprinkler irrigation,the net photosynthetic rate,stomatal conductance and light use efficiency were significantly reduced by 29%-37%,40%-49% and 29%-35%,respectively,which seriously affected the photosynthetic capacity of the leaves.In 2020,the leaf area index of 2 g/L brackish water sprinkler irrigation was reduced by 15% compared with that of fresh water sprinkler irrigation but with no significant difference,and the leaf area index of 3 g/L brackish water sprinkler irrigation was significantly reduced by 28%.In 2021,there was no significant difference in leaf area index between different treatments during the whole growing period.There was no significant difference in plant height between different treatments during the whole growth period of two years.2 g/L brackish water sprinkler irrigation had no significant effect on yield of summer maize in both years,and the yield of 3 g/L brackish water sprinkler irrigation was significantly reduced by 9% in 2020.No significant differences were observed in ear count,kernel number per ear,or 100-grain weight across the irrigation treatments.In summary,the salinity of brackish water sprinkler irrigation less than 2 g/L can guarantee the growth and yield of summer maize in this area.

Key words: Summer maize, Brackish and fresh mixed water, Sprinkling irrigation, Root dry weight density, Photosynthetic characteristics, Yield

CLC Number:

HAN Qing, GUO Zikang, WANG Hanbo, CHEN Wenbin, WANG Haiye, GU Baoqun, ZHANG Dasheng, JIAO Yanping, WANG Tieqiang. Regulating Effects of Sprinkling Irrigation Using Brackish and Fresh Mixed Water on Root Distribution,Photosynthetic Characteristics and Yield of Summer Maize[J]. Acta Agriculturae Boreali-Sinica, 2025, 40(S1): 70-77. doi: 10.7668/hbnxb.20194974.

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References 23

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处理 Treatment	蒸腾速率/ (mmol/(m²·s)) Tr	净光合速率/ (μmol/(m²·s)) Pn	胞间CO₂浓度/ (μmol/mol) Ci	气孔限制值 Ls	气孔导度/ (mol/(m²·s)) Gs	光能利用效率/ (μmol/μmol) LUE	叶片水分利用效率/ (μmol/mmol) LWUE
FI	2.51±0.19a	24.23±0.83a	290.70±4.87b	0.28±0.02b	0.39±0.03a	0.016±0.001a	9.80±0.69b
SI	3.22±0.32a	20.16±1.46ab	332.04±5.17a	0.21±0.01c	0.42±0.05a	0.013±0.001ab	6.32±0.23b
HSI	1.23±0.21b	17.15±1.57b	269.17±6.98c	0.35±0.02a	0.21±0.02b	0.011±0.001b	15.09±2.27a

处理 Treatment	蒸腾速率/ (mmol/(m²·s)) Tr	净光合速率/ (μmol/(m²·s)) Pn	胞间CO₂浓度/ (μmol/mol) Ci	气孔限制值 Ls	气孔导度/ (mol/(m²·s)) Gs	光能利用效率/ (μmol/μmol) LUE	叶片水分利用效率/ (μmol/mmol) LWUE
FI	2.51±0.19a	24.23±0.83a	290.70±4.87b	0.28±0.02b	0.39±0.03a	0.016±0.001a	9.80±0.69b
SI	3.22±0.32a	20.16±1.46ab	332.04±5.17a	0.21±0.01c	0.42±0.05a	0.013±0.001ab	6.32±0.23b
HSI	1.23±0.21b	17.15±1.57b	269.17±6.98c	0.35±0.02a	0.21±0.02b	0.011±0.001b	15.09±2.27a

处理 Treatment	蒸腾速率/ (mmol/(m²·s)) Tr	净光合速率/ (μmol/(m²·s)) Pn	胞间CO₂浓度/ (μmol/mol) Ci	气孔限制值 Ls	气孔导度/ (mol/(m²·s)) Gs	光能利用效率/ (μmol/μmol) LUE	叶片水分利用效率/ (μmol/mmol) LWUE
FI	2.21±0.37b	16.19±1.06a	289.02±24.03a	0.38±0.05b	0.17±0.03a	0.011±0.001a	7.84±1.08a
SI	2.90±0.58a	12.71±2.17b	299.96±13.08a	0.33±0.03b	0.16±0.03a	0.008±0.001ab	4.58±0.38b
HSI	1.90±0.42b	10.15±2.20c	240.34±15.62b	0.47±0.03a	0.09±0.02b	0.007±0.001b	5.45±0.30b

处理 Treatment	蒸腾速率/ (mmol/(m²·s)) Tr	净光合速率/ (μmol/(m²·s)) Pn	胞间CO₂浓度/ (μmol/mol) Ci	气孔限制值 Ls	气孔导度/ (mol/(m²·s)) Gs	光能利用效率/ (μmol/μmol) LUE	叶片水分利用效率/ (μmol/mmol) LWUE
FI	2.21±0.37b	16.19±1.06a	289.02±24.03a	0.38±0.05b	0.17±0.03a	0.011±0.001a	7.84±1.08a
SI	2.90±0.58a	12.71±2.17b	299.96±13.08a	0.33±0.03b	0.16±0.03a	0.008±0.001ab	4.58±0.38b
HSI	1.90±0.42b	10.15±2.20c	240.34±15.62b	0.47±0.03a	0.09±0.02b	0.007±0.001b	5.45±0.30b

处理 Treatment	蒸腾速率/ (mmol/(m²·s)) Tr	净光合速率/ (μmol/(m²·s)) Pn	胞间CO₂浓度/ (μmol/mol) Ci	气孔限制值 Ls	气孔导度/ (mol/(m²·s)) Gs	光能利用效率/ (μmol/μmol) LUE	叶片水分利用效率/ (μmol/mmol) LWUE
FI	4.70±0.21a	25.70±1.56a	276.86±3.44a	0.27±0.01a	0.45±0.03a	0.017±0.001a	5.47±0.21b
SI	3.34±0.18b	19.88±1.01b	289.84±5.20a	0.25±0.01a	0.36±0.01b	0.013±0.001ab	6.04±0.60b
HSI	1.71±0.13c	16.63±1.57c	294.19±8.09a	0.26±0.02a	0.27±0.01c	0.011±0.001b	10.02±1.36a

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