| Cite this article: | 冯 棣,郭桂莲,焦 钰,等.咸水灌溉下生物炭用量对油葵出苗及产量的影响[J].灌溉排水学报,0,():-. |
| feng di,guo guilian,jiao yu,et al.咸水灌溉下生物炭用量对油葵出苗及产量的影响[J].灌溉排水学报,0,():-. |
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| Effects of biochar on the emergence and yield of oil sunflower under saline water irrigation |
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feng di,guo guilian,jiao yu,et al
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1.Facility Horticulture Laboratory of Universities in Shandong/ Weifang University of Science and Technology;2.Tianjin Tianlong Technology Corporation Limited
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| Abstract: |
| 【Objective】In order to explore the suitable dosage of biochar under saline water irrigation, to improve the utilization efficiency of saline water. 【Method】In this study, oil sunflower as the research crop, the laboratory seedling experiment and field test were designed. In the laboratory experiment, 1 kind of nutrient soil substrate (NSS) and 5 kinds of soil substrate mixed with biochar (SSMB) at the levels of 0, 10, 20, 40, 80 g/kg, were set. And 0.6, 2.1, 3.6, 5.1 and 6.6 g/L saline water were applied, respectively. The emergence rate and seedling height of oil sunflower were investigated. In the field test, 4 biochar dosages of 0, 1, 3 and 5 kg/m2 were set, labeled as C0, C1, C3 and C5, respectively. 5.1 g/L saline water was drip irrigated, and irrigation was triggered when the soil matrix potential at 20 cm directly below the emitter lower than -25 kPa, and the irrigation quota is 10 mm. Growth of oil sunflower and dynamics of soil moisture and salt were investigated. 【Result】The results showed that emergence rate of oil sunflower had no significant decline when the salinity of irrigation water not higher than 5.1 g/L. when the salinity of irrigation water reached 6.6 g/L, except the emergence rate of NSS treatment was not affected, all the SSMB treatments were inhibited, while only the decline of 80 g/kg treatment (12.5%) was significant (P<0.05). The seedling height of NSS was higher than all SSMB treatments, and the highest seedling height occurred in the 20 g/kg treatment. Field test results showed that the final soil electrical conductivity of water solution with soil-water mass ratio of 1:5 increased by 56.9±1.2% compared with the initial value. Biochar used within 5 kg/m2 had no significant effect on soil salinity mean value within 0～60 cm soil layer. But as the soil salinity increased, the treatments of applied biochar had a salt-lowering effect in the soil layer of 10～20 cm. Compared with C0 treatment, the diameter of oil sunflower head, dry matter mass and grain yield of C1, C3 and C5 treatments all increased significantly(P<0.05). The smallest increment with 8.9%, 25.3% and 25.3% occurred in the the diameter of oil sunflower head. The biggest increment with 35.4%, 99.5% and 150.8% occurred in dry mass of leaves. Compared with C0 treatment, the grain yield of C1, C3 and C5 treatment increased by 31.2%, 91.6%, and 93.3%, respectively, with no significant difference between C3 and C5 treatment (P> 0.05). 【Conclusion】Nutrient soil should be used as the substrate when using saline water irrigation for cultivation of seedling. And high yield and high saline water utilization rate can be obtained when the dosage of biochar is 3 kg/m2 after seedling transplanting. This study can provide technical reference for using biochar to improve the yield of oil sunflower under drip irrigation with saline water. |
| Key words: Oil sunflower; drip irrigation; saline water; biochar; yield |
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