loading page

Rice--duck co-culture system promoted phosphorus absorption by changing soil phosphorus forms in the Yangtze River Delta of eastern China
  • +3
  • Zhimin Sha,
  • Hui Gao,
  • Jun Wang,
  • Kaikai Fang,
  • Wei Dai,
  • Linkui Cao
Zhimin Sha
Shanghai Jiao Tong University

Corresponding Author:[email protected]

Author Profile
Hui Gao
Shanghai Jiao Tong University
Author Profile
Jun Wang
Shanghai Jiao Tong University
Author Profile
Kaikai Fang
Shanghai Jiao Tong University
Author Profile
Wei Dai
Shanghai Jiao Tong University
Author Profile
Linkui Cao
Shanghai Jiao Tong University
Author Profile

Abstract

Study the variation characteristics of soil phosphorus (P) forms are crucial for measuring soil quality and P absorption. However, studies on the effects of rice–duck co-culture system on soil P forms in flooded and dryer period as well as on the relationships among P forms, P absorption and environmental factors remain insufficient. A rice field experiment with consistent P inputs in each fertilizer treatment: no fertilizer (RD and RM), chemical fertilizer (RDF and RMF), organic fertilizer (RDO and RMO), and a mixture of 70% chemical and 30% organic fertilizers (RDFO and RMFO) were conducted to study it. The results showed that RDO and RDFO had higher readily available inorganic P pool (Resin P + NaHCO 3-P i), extractable organic P fractions (NaHCO 3-P o + NaOH-P o), and Fe-P and Al-P (NaOH-P i) than the corresponding rice monoculture. RDF decreased the extractable organic P fractions (NaHCO 3-P o + NaOH-P o) and Fe-P and Al-P (NaOH-P i) compared with RMF; RDO increased the accumulation of Residual-P while RDF and RDFO decreased the accumulation of Residual-P compared with RMO, RMF, and RMFO. pH was the dominant factor affecting P forms of soil. RDF and RDFO had higher P content of grain and straw that mainly affected by soil NaHCO 3-P i and NaOH-P i than other treatments. Simultaneously, rice–duck co-culture system can increase phosphorus use efficiency (PUE), especially RDF significantly increased by 171.63% and 22.63% than RDO and RDFO, respectively. In conclusion, our results suggested that rice–duck co-culture can promote rice grain and straw to absorb soil P by changing the soil pH to stimulate soil surplus P into active P. RDFO was the most recommended agricultural production model for comprehensive production.