Physiological effects of humic acid in peanut growing in continuous cropping soil

Abstract

Although humic acid has been demonstrated to improve the yield of some crops, the long-term effects of continuous cropping on peanut remain largely undetermined. In the present study, we aimed to compare the continuous effects of different concentrations of humic acid on the continuously cropped peanut. A 3-year experiment was conducted in the North China Plain. Treatments of 50 kg•ha-1 (T1), 100 kg•ha-1 (T2), and 150 kg•ha-1 (T3) humic acid were applied with inorganic fertilizer along with the equal nitrogen, phosphorus and potassium inputs. Compared with the control group, humic acid increased the yield and oxidative stress tolerance of continuously cropped peanut. To elucidate the mechanism, various physiological indicators were evaluated and compared in this study. First, humic acid This article is protected by copyright. All rights reserved. increased chlorophyll content and the ability to incorporate nutrients, and the maximum effect was achieved by T3 in 2016. Second, the activities of nitrate reductase and sucrose phosphate synthase in peanut leaves were significantly increased after humic acid treatment, and the most increase was achieved by T2. Third, the activities of antioxidant enzymes were increased, the malondialdehyde content was reduced in 2016-2018 by T3, and the same effects were observed in roots and leaves. Fourth, the content of the hormone was changed after humic acid treatment. Collectively, humic acid improved the yield and tolerance of continuously cropped peanut due to the above-mentioned four reasons, which were conducive to alleviating the obstacles of continuously cropped peanut.

Physiological and Expressional Regulation on Photosynthesis, Starch and Sucrose Metabolism Response to Waterlogging Stress in Peanut

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Organic amendments alleviate early defoliation and increase fruit yield by altering assembly patterns and of microbial communities and enzymatic activities in sandy pear (Pyrus pyrifolia)

“…Organic amendments include humic acid (HA) (Li et al 2020b ; Zaller 2006 ) and organic fertilizer (Jiang et al 2020b ; Liu et al 2019 ; Ma et al 2018 ) have been widely used to maintain or increase soil fertility, microbial activity, and improve fruit yield in orchards. The use of organic amendments combined with chemical fertilizers, or the partial replacement of chemical fertilizers with organic fertilizers, is viewed as a feasible way to increase crop yields in the short term, and increase soil organic matter in the long term (Ji et al 2020 ; Li et al 2017 ; Wei et al 2016 ).…”

Performance of Groundnut (Arachis hypogaea L.) as Influenced by Integrated Nutrient Management Under Fertigation

“…It is widely used as fertilizer synergist and hence in combination with inorganic fertilizers can enhance their use efficiency and improve root zone activity. Previous research results reported that application of humic acid improved the agronomic traits and increased yield and quality of peanut as reported by Li et al (2021) and Zhang et al (2014).…”