Coated Diammonium Phosphate Combined With Humic Acid Improves Soil Phosphorus Availability and Photosynthesis and the Yield of Maize

作者：Qi Chen, Zhaoming Qu, Zeli Li, Zixin Zhang, Guohua Ma, Zhiguang Liu, Yanfeng Wang, Liang Wu, Fuli Fang, Zhanbo Wei, Min Zhang · 发表于：Frontiers in Plant Science · 年份：2021 · DOI：10.3389/fpls.2021.759929 · 被引用次数：28 · 研究领域：Phosphorus and nutrient management、Plant Growth Enhancement Techniques、Polymer-Based Agricultural Enhancements

Controlled release phosphorus (P) fertilizers and humic acid (HA) applications are two effective and significant techniques or measures for preventing P loss and enhancing maize development. However, the underlying physiological mechanism of how the controlled release P fertilizers combined with HA affect the maize production and P-use efficiency (PUE) remains unknown. The effects of applying coated diammonium phosphate (CDAP) and HA together on soil nutrient supply intensity, soil phosphatase activity, photosynthesis, endogenous hormone contents, and yield of maize, as well as PUE, were examined in this study. In a pot experiment, two types of P fertilizers—CDAP and diammonium phosphate (DAP)– as well as two HA application rates (0 and 45 kg ha –1 ) and two P levels (60 and 75 kg P 2 O 5 ha –1 ) were utilized. Results showed that the key elements that influence the growth and yield of the maize were the availability of P content in soil, plant photosynthesis, and hormone levels. The combination of CDAP and HA had a greater impact on yield and PUE over the course of 2 years than either DAP alone or DAP combined with HA. Besides, using CDAP in combination with HA increased the yield and PUE by 4.2 and 8.4%, respectively, as compared to the application of CDAP alone at 75 kg P 2 O 5 ha –1 . From the twelve-leaf to milk stages, the available P content in the soil was increased by an average of 38.6% with the combination of CDAP and HA compared to the application of CDAP alone at...