Biochar Effects on Soil Properties and Wheat Biomass vary with Fertility Management

Agronomy

Rajan Ghimire¹  Stephen Machado²  Larry Pritchett²  Prakriti Bista² 

[1] Agriculture Science Center, New Mexico State University, Clovis, NM 88101, USA;Columbia Basin Agricultural Research Center, Oregon State University, Pendleton, OR 97801, USA;

关键词: nutrient cycling;    soil health;    soil organic matter;   

DOI  :  10.3390/agronomy9100623

来源: DOAJ

【 摘 要 】

Biochar can improve soil health and crop productivity. We studied the response of soil properties and wheat growth to four rates of wood biochar (0, 11.2, 22.4, and 44.8 Mg ha⁻¹) and two fertilizer rates [no fertilizer and fertilizer (90 kg N ha⁻¹, 45 kg P ha⁻¹, and 20 kg S ha⁻¹)]. Biochar application increased soil organic matter (SOM), soil pH, phosphorus (P), potassium (K), sulfur (S) contents, and the shoot and root biomass of wheat. However, these responses were observed at biochar rates below 22.4 Mg ha⁻¹, particularly in treatments without fertilizer. In fertilizer-applied treatments, soil nitrate levels decreased with an increase in biochar rates, mainly due to better crop growth and high nitrate uptake. However, without N addition, the high C:N ratio (500:1) possibly increased nutrient tie-up, reduced plant biomass, and SOM buildup at the highest biochar rate. Based on these results, we recommend biochar rates of about 22.4 Mg ha⁻¹ and below for Walla Walla silt loams.

【 授权许可】

Unknown