| Effects of different irrigation treatments on cationic composition of soil and dry matter accumulation of maize in coastal saline\|alkali area |
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| DOI：10.7606/j.issn.1000-7601.2020.04.11 |
| Key Words: saline\|alkali soil irrigation method drip irrigation under mulch soil cation maize dry matter accumulation |
| Author Name | Affiliation | | WANG Hang | College of Water Conservancy Engineering, Tianjin Agricultural University, Tianjin 300384,China | | ZHOU Qingyun | College of Water Conservancy Engineering, Tianjin Agricultural University, Tianjin 300384,China
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100083, China | | ZHANG Baozhong | State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100083, China
National Center of Efficient Irrigation Engineering and Technology Research\|Beijing, Beijing 100083, China | | MA Bo | College of Water Conservancy Engineering, Tianjin Agricultural University, Tianjin 300384,China
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100083, China | | YIN Linping | College of Water Conservancy Engineering, Tianjin Agricultural University, Tianjin 300384,China
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100083, China |
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| Abstract: |
| In order to investigate the effects of different irrigation treatments on the soil cation composition of the coastal saline\|alkali land in Tianjin, a field experiment was carried out to investigate the variation of K+/Na+, Ca2+/Na+ in the 0~60 cm soil and dry biomass accumulation in maize after irrigation. Four different treatments were designed, LI10 (conventional drip irrigation, 10 mm), LI20 (conventional drip irrigation, 20 mm), FI10 (drip irrigation under mulch, 10 mm), and FI20 (drip irrigation under mulch, 20 mm), respectively. The results showed that the K+/Na+ in 0~60 cm soil layer with higher irrigation amount were higher than those with lower irrigation amount under different irrigation treatments. The K+/Na+ in the 0~20 cm soil layer was greater, while the K+/Na+ in the 40~60 cm soil layer was lower. The Ca2+/Na+ratio was higher in all soil layers of 0~60 cm under mulch drip irrigation with the same irrigation amount, while there was no significant difference among all soil layers of 0~60 cm under different irrigation treatments, with a range of 0.10~0.22. The ratios of K+/Na+ and Ca2+/Na+ in 0~20 cm soil layer treated with FI20 were much higher than those in other treatments, reaching 0.78 and 0.22, respectively.With increasing irrigation times, K+/Na+ and Ca2+/Na+ in 0~20 cm soil layer treated with LI20 and FI10 were gradually increased, while the treatment with LI10 gradually decreased. After irrigation, K+/Na+ and Ca2+/Na+ differences in 0~60 cm soil layers reached significant levels. The dry biomass accumulation in the whole growth period and the correlation coefficient of the 0~20 cm soil layer (K+/Na+) /Ca2+ secondary fitting were all above 0.90, under the same (K+/Na+)/Ca2+ condition, the dry matter accumulation in FI20 treatment always reached the maximum and that in LI10 treatment was always at the minimum.When(K+/Na+)/Ca2+>1.72, the dry matter accumulation of each treatment increased with the increase in (K+/Na+)/Ca2+. |
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