Can arbuscular mycorrhiza and fertilizer management reduce phosphorus runoff from paddy fields?
Shujuan Zhang
,
Li Wang
,
Fang Ma
,
Xue Zhang
,
Zhe Li
,
Shiyang Li
,
Xiaofeng Jiang
DOI:10.1016/j.jes.2015.01.016
Received October 30, 2014,Revised December 30, 2014, Accepted January 27, 2015, Available online May 06, 2015
Volume 27,2015,Pages 211-218
Our study sought to assess how much phosphorus (P) runoff from paddy fields could be cut down by fertilizer management and inoculation with arbuscular mycorrhizal fungi. A field experiment was conducted in Lalin River basin, in the northeast China: six nitrogen–phosphorus–potassium fertilizer levels were provided (0, 20%, 40%, 60%, 80%, and 100% of the recommended fertilizer supply), with or without inoculation with Glomus mosseae. The volume and concentrations of particle P (PP) and dissolved P (DP) were measured for each runoff during the rice growing season. It was found that the seasonal P runoff, including DP and PP, under the local fertilization was 3.7 kg/ha, with PP, rather than DP, being the main form of P in runoff water. Additionally, the seasonal P runoff dropped only by 8.9% when fertilization decreased by 20%; rice yields decreased with declining fertilization. We also found that inoculation increased rice yields and decreased P runoff at each fertilizer level and these effects were lower under higher fertilization. Conclusively, while rice yields were guaranteed arbuscular mycorrhizal inoculation and fertilizer management would play a key role in reducing P runoff from paddy fields.
