Abstract:In order to explore the biochar application schemes suitable for different coastal saline soils, the maize growth experiment was conducted in two typical saline soils(silt loam, sandy loam)from the coastal reclamation area of Jiangsu. The effect of biochar(0, 25, 50, 75, 100 g/kg )on the reclamation of coastal saline soils and the maize physiolo-gical growth was discussed. The results showed that biochar decreased the electrical conductivity and Na+ concentration; and increased Ca2+, Mg2+ and K+ concentration; biochar decreased the bulk density of the 0—20 cm layer of costal saline soils,and increased the porosity and organic matter content. Appropriate biochar application promoted the photosynthesis ability of maize, increasing the net photosynthetic rate, stomatal conductance and chlorophyll content of leaves. At the same time, biochar mitigated the salt stress of saline soil on maize, resulting in lower leaf abscisic acid content and ωNa+/ωK+ ratio. The leaf hydrogen peroxide and malondialdehyde were significantly reduced by biochar, indicating the alleviated oxidative stress response. The suitable biochar addition amount varied with soil texture. In silt loam soil, the physiological and maize yield index reached their peak at 50 g/kg. Biochar application up to 75 and 100 g/kg caused pore blocked and aggravated soil salt accumulation, inhibited photosynthesis, increased salt stress and oxidative damage, and interfered with maize growth and yield. In sandy loam soil, 25 g/kg biochar had little effect on the soil and maize. When it increased to 50 g/kg and above, the effect was significant, but there was no significant difference between 75 g/kg and 100 g/kg treatment. Studies have shown that the suitable biochar additions for the improvement of silt loam and sandy loam are 50 and 75 g/kg, respectively.
迮裕雯,朱成立*,黄明逸,赵红玉,翟亚明. 不同盐渍土中生物炭对玉米生理生长的影响[J]. 排灌机械工程学报, 2021, 39(4): 426-432.
ZE Yuwen,ZHU Chengli*,HUANG Mingyi,ZHAO Hongyu,ZHAI Yaming. Effect of biochar application in different saline soils on physiological growth of maize. Journal of Drainage and Irrigation Machinery Engin, 2021, 39(4): 426-432.