Effect of P Reduction on phoD -Harboring Bacteria Community in Solar Greenhouse Soil

Ting Bian, Zhen Wang, Shuang Wang, Xuan Shan, Tianqi Wang, Hongdan Fu () and Zhouping Sun ()
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Ting Bian: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China
Zhen Wang: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China
Shuang Wang: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China
Xuan Shan: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China
Tianqi Wang: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China
Hongdan Fu: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China
Zhouping Sun: College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China

Agriculture, 2024, vol. 14, issue 11, 1-19

Abstract: Phosphorus (P) enrichment frequently occurs in the soil used in greenhouse vegetable production (GVP). Minimizing the application of P fertilizer represents a crucial approach to mitigating the accumulation of P in the soil and enhancing its utilization efficiency. However, the changes in bacterial communities and the turnover mechanism of soil P fractions related to soil P cycling after P fertilizer reduction are still unclear. To unravel these complexities, we devised three experimental treatments: conventional nitrogen (N), P, and potassium (K) fertilizer (N1P1K1); conventional N and K fertilizer without P (N1P0K1); and no fertilizer (N0P0K0). These experiments were conducted to elucidate the effects of P reduction on cucumber plant growth, soil P fractions, and the phoD -harboring bacterial community in the P-rich greenhouse soil. The results showed that there were no significant differences between the N1P1K1 and N1P0K1 treatments in terms of plant growth, yield, and P uptake, and the values for the N0P0K0 treatment were significantly lower than those for the N1P1K1 treatment. In a state of P depletion (N0P0K0, N1P0K1), the main P sources were Resin-P i , NaHCO 3 -P i , NaHCO 3 -P o , and NaOH-P i . The contents of NaOH-P o and CHCl-P o in the N1P0K1 treatment increased significantly. Without P fertilizer, alkaline phosphatase (ALP) activity, phoD gene abundance, and bacterial community diversity were significantly increased. The abundance of Ensifer in the N0P0K0 and N1P0K1 treatments was 8 and 10.58 times that in the N1P1K1 treatment, respectively. Additionally, total phosphorus (TP) and available nitrogen (AN) were key factors affecting changes in the phoD bacterial community, while Shinella , Ensifer and Bradyrhizobium were the main factors driving the change in soil P fractions, and NaHCO 3 -P i and NaOH-P i were key factors affecting crop yield. Therefore, reducing the application of P fertilizer will increases the diversity of phoD -gene-harboring bacterial communities and promote organic P mineralization, thus maintaining the optimal crop yield.

Keywords: cucumber; greenhouse soil; soil P fractions; phoD -harboring bacteria (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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