Composite micronutrient nanoparticles and salts decrease drought stress in soybean

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• 作者：Christian O. Dimkpa ; Prem S. Bindraban ; Job Fugice…
• 关键词：Agronomic fortification ; Climate ; smart fertilization ; Drought ; Micnobits ; Micronutrients ; NPK ; Nanofertilizers ; Nutrient uptake dynamics
• 刊名：Agronomy for Sustainable Development
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：37
• 期：1
• 全文大小：
• 刊物主题：Agriculture; Soil Science & Conservation; Sustainable Development;
• 出版者：Springer Paris
• ISSN：1773-0155
• 卷排序：37

文摘

Drought decreases crop productivity, with economic consequences for farmers. For soybean, drought particularly affects the reproductive phase. There is therefore a need for strategies that minimize drought effects, such as agronomic fortification with micronutrients. Here, we evaluated the mitigation of drought stress in soybean using composite formulations of three micronutrient nanoparticles, ZnO, B₂O₃, and CuO, and their salts: ZnSO₄·7H₂O, H₃BO₃, and CuSO₄·5H₂O, in a greenhouse. The micronutrients were soil or foliar applied 3 weeks after seed germination. Drought was imposed at 50% field moisture capacity. We measured parameters related to growth, yield, and nutrient uptake dynamics during 19 weeks. Results show that drought decreased soybean shoot growth by 27% and grain yield by 54%. Application of salt formulations to soil was more effective than foliar application, in mitigating drought stress. For foliar application, the effects of nanoparticles and salts were similar. On average, the formulations reduced drought effects by increasing shoot growth by 33% and grain yield by 36%. On average, the formulations increased shoot N by 28%, K by 19%, Zn by 1080%, B by 74%, and Cu by 954%. Likewise, the formulations, on average, increased grain N by 35%, K by 32%, Zn by 68%, B by 56%, and Cu by 13%. In contrast, drought did not alter shoot P, but the formulations, on average, reduced shoot P by 33%. Whereas micronutrient salts are known to reduce drought effects in plants, our findings demonstrate for the first time a novel use of micronutrient nanoparticles to boost crop performance and N and P uptake under drought stress.