Effect of Biochar on Seedling Growth and Related Physiological Characteristics of Sorghum under Different Levels of Nitrogen Fertilizer

doi:10.7668/hbnxb.2014.06.033

Abstract

Abstract: A pot experiment was conducted to evaluate the effect of biochar(Produced from corn stover)at application rates of 0,1%,5%,10%(w/w)and different nitrogen levels of 0,400,800 kg/ha and their interactions on early seedling growth and related physiological characteristics of sorghum (Sorghum bicolor (L.)Moench).The experimental results showed that the growth of seedlings in the low EC soil was better than the high EC soil as a whole.1% biochar was superior to the control for the seedling growth;however,5% and 10% biochar had inhibitory effect on sorghum seedling growth.There was no significant difference between two levels of 0,400,800 kg/ha level produced inhibition on the seedling growth.The effects of biochar application rates,N application levels and their interaction on seedling dry weight in both low EC and high EC soils were significant.The trend of influence of different treatments on sorghum seedling chlorophyll was consistent with the sorghum growth parameters change;the influence of different treatments on the plant reducing sugar was mixed.Nitrate content of sorghum was significantly positively related to the level of nitrogen fertilizer and negatively correlated with biochar dosage.This study indicated that low biochar application rate(1%)could stimulate seed germination and early seedling growth,higher biochar application rate(5% and 10%)and higher N application level(800 kg/ha)could inhibit seedling growth.Nitrate content in seedlings was decline with biochar rate increase,and increase with N level enhance.

Key words: Biochar, Nitrogen fertilizer, Sorghum, Physiological characteristics

CLC Number:

S156.2

WANG Hao, JIAO Xiao-yan, WANG Jin-song, DING Yu-chuan, WU Ai-lian, DONG Er-wei, WANG Li-ge. Effect of Biochar on Seedling Growth and Related Physiological Characteristics of Sorghum under Different Levels of Nitrogen Fertilizer[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(6): 195-201. doi: 10.7668/hbnxb.2014.06.033.

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