Biodegradable PASP can effectively inhibit nitrification, moderate NH₃ emission, and promote crop yield

ABSTRACT

Polyaspartic acid (PASP) is a low-cost, environmentally friendly, and multifunctional polymer material. The knowledge regarding the effects of PASPs, especially the PASPs with a different molecular weight (MW), on nitrogen use efficiency (NUE), ammonia (NH₃) volatilization and nitrous oxide (N₂O) emission in crop fields is scarce. In this study, maize pot experiments were conducted to evaluate three types of PASPs with different MW. Five treatments were designed: (1) application of chemical phosphorus (P) and potassium (K) fertilizer (PK), (2) PK plus urea (NPK), (3) NPK plus PASP-1 (PASPT1, MW: 5517), (4) NPK plus PASP-2 (PASPT2, MW: 6934), and (5) NPK plus PASP-3 (PASPT3, MW: 7568). The yield indicators of crop height, straw dry weight and 100-grain weight showed that PASP application improved the crop growth. In PASP3, NUE reached 46.1%, almost double of that in NPK (28.6%). Moreover, there were significantly less N losses in the forms of NH₃ volatilization and NO₂ emission following PASP amendment than regular urea application. Another positive impact revealed that PASP inhibited the transformation of NH₄⁺-N to NO₃^–N. Among the three PASPs, PASP-3 with the highest MW overall presented optimal effects, implying that MW was a major driving factor for PASP performance on maize production.

KEYWORDS:

• NH₃ volatilization
• nitrification inhibition
• N₂O emission
• nitrogen utilization efficiency
• polyaspartic acid

Acknowledgments

We acknowledge all staffs participating in the experiment.

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

Supplemental data for this article can be accessed here.

Additional information

Funding

The research was supported by the National Key Research and Development Program of China [2018YFD0200200, 2016YFD0800500]; the State Scholarship Fund by the China Scholarship Council [CSC]; Fundamental Research Funds for Central Non-profit Scientific Institution [1610132016005].