Sulfur-enriched leonardite and humic acid soil amendments enhance tolerance to drought and phosphorus deficiency stress in maize (Zea mays L.)

مقال فى مجلة

2020

تم النشر فى: https://doi.org/10.1038/s41598-020-62669-6

Soil amendments are known to promote several plant growth parameters. In many agro-ecosystems, water scarcity and drought induced phosphorus deficiency limits crop yield significantly. Considering the climate change scenario, drought and related stress factors will be even more severe endangering the global food security. Therefore, two parallel field trials were conducted to examine at what extent soil amendment of leonardite and humic acid would affect drought and phosphorus tolerance of maize. The treatments were: control (C: 100% A pan and 125kgP ha(-1)), P deficiency (phosphorus stress (PS): 62.5kgP ha(-1)), water deficit stress (water stress (WS): 67% A pan), and PS+WS (67% A pan and 62.5kgP ha(-1)). Three organic amendments were (i) no amendment, (ii) 625kgS+750kg leonardite ha(-1) and (iii) 1250kgS+37.5kg humic acid ha(-1)) tested on stress treatments. Drought and P deficiency reduced plant biomass, grain yield, chlorophyll content, F-v/F-m, RWC and antioxidant activity (superoxide dismutase, peroxidase, and catalase), but increased electrolyte leakage and leaf H2O2 in maize plants. The combined stress of drought and P deficiency decreased further related plant traits. Humic acid and leonardite enhanced leaf P and yield in maize plants under PS. A significant increase in related parameters was observed with humic acid and leonardite under WS. The largest increase in yield and plant traits in relation to humic acid and leonardite application was observed under combined stress situation. The use of sulfur-enriched amendments can be used effectively to maintain yield of maize crop in water limited calcareous soils.

• مجلة/صحيفة: SCIENTIFIC REPORTS