| Effects of brackish and fresh water irrigation on tomato growth and quality under different substrates |
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| DOI：10.7606/j.issn.1000-7601.2021.05.20 |
| Key Words: brackish water tomato biochar earthworm compost growth quality |
| Author Name | Affiliation | | WU Yufang | College of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China | | YANG Guankai | College of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China | | CAO Hanghang | College of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China | | WANG Xiaodong | College of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China | | ZHANG Xueyan | College of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China |
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| Abstract: |
| This study was to explore the effect of different culture substrate conditions on tomato plant growth and quality under brackish water (b) and fresh water (f) irrigation. Three kinds of cultivation substrates of peat (Pf, Pb), peat + earthworm manure (PEf, PEb), and peat + biochar (PBf, PBb), and two kinds of irrigation water, brackish water irrigation (b) and fresh water irrigation (f), were combined into six treatments. Tomato plant growth, photosynthetic properties, fluorescence characteristics, fruit quality and yield were analyzed in this trial. The results showed that there was no significant difference in the relative growth rates of plant height and stem volume under fresh water and brackish water irrigation.Compared with peat treatment, PEf under fresh water irrigation significantly increased the soluble sugar and soluble solids by 11.17% and 19.84%, and PBf significantly increased the total biomass and shoot dry weight by 32.01% and 32.21%. Under brackish water irrigation, PEb and PBb significantly increased the total biomass and above\|ground biomass by 49.41%, 63.59% and 54.04%, 61.27%, respectively, and PEb significantly increased the photosynthetic rate by 13.2% and stomatal conductance by 381.75%. PBb significantly increased photosynthetic rate (Pn), stomatal conductance (Gs), WUE, qP, and ETR to 32.69%, 71.94%, 23.27%, 58.87%, and 14.35%, respectively. Under the same substrate, PEb significantly increased transpiration rate (Tr) 49.29%, stomatal conductance 222% and Fm 5.6% compared to PEf. PBb increased fruit Vc content by 37.43% and soluble sugar by 6.25% compared to PBf. The yield under brackish water irrigation was lower than that of freshwater treatment, but compared with peat treatment, the yield of peat with biochar increased by 32.26%.Comprehensive analysis showed that under the same substrate, brackish water reduced the comprehensive score in Pb and PBb, and increased comprehensive score in PEb. In addition, PEb and PBb improved comprehensive score under brackish water treatment compared to Pb. Therefore, the addition of biochar and earthworm feces to peat was beneficial to alleviate brackish water stress and improve crop biomass accumulation. Based on the comprehensive ranking of membership function, the addition of biochar with peat had the best effect on tomato growth under fresh water and brackish water irrigation. |
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