Comparing the performance of P Olsen and P saturation degree in predicting crop yields and P leaching risks using long-term P fertilization experiments

Research output: Chapter in Book/Report/Conference proceedingAbstract

Abstract

In this study, we investigated the effects of long-term phosphorus (P) addition on different soil P pools, crop yield, and environmental risks in wheat-maize rotation systems in China. We examined changes in four soil P pools (PCACL2, POLSEN, POX, and PTOTAL) and evaluated crop yield responses and potential P leaching losses to various P fertilization rates and resources. We also assessed the performance of POLSEN and P saturation degree (PSD) in predicting crop response and environmental risks. Our findings revealed that POLSEN and POX increased linearly with accumulated P input, reaching their maximum values near 3200 kg P ha-1. Continuing P application above that threshold only caused a gradual increase in PTOTAL and a linear increase in PCACL2, implying an increased leaching risk. The majority of the surplus P accumulated in POX before saturation. Moreover, PSD better explained the variation in crop yield and potential P leaching losses than POLSEN. The critical PSD level for enhanced P leaching risk was found to be 0.20, which is near the target level for crop yields when using a cut-off point at 80% of the maximum yield (0.22). Our results suggest that long-term P accumulation can saturate soil-reactive P pools (POX & POLSEN), and additional P inputs will accumulate in more stable P forms or induce a higher leaching risk once the soil is saturated. Additionally, PSD can be used to optimize P management for both crop yields and potential leaching risks.
Original languageEnglish
Title of host publication2023 Book of Abstracts: Wageningen Soil Conference
Subtitle of host publicationWorking together on solutions for a sustainable world
Place of PublicationWageningen
PublisherWageningen University & Research
Pages56-56
Publication statusPublished - 2023

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