Influence of Organic Amendment on Soil Respiration and Maize Productivity in a Semi-Arid Environment

oleh: Shirley Lamptey, Junhong Xie, Lingling Li, Jeffrey A. Coulter, Padma Shanthi Jagadabhi

Format: Article
Diterbitkan: MDPI AG 2019-10-01

Deskripsi

Soil degradation and C emissions are a threat to sustainable agriculture in many arid and semi-arid areas. For sustainable agriculture, the influence of soil amendments on crop production and soil respiration has been a key focus of research. A three-year field study to assess how soil amendments influence soil properties, soil respiration (Rs), and yield of maize (<i>Zea mays</i> L.) was conducted. Treatments were: no amendment (NA), chemical fertilizer (CF), swine (<i>Sus scrofa</i> L.) manure (SM), maize stover (MS), and swine manure + chemical fertilizer (SC). Soil amendment (CF, SM, MS, and SC) consistently produced greatest grain yield and aboveground biomass, which averaged 38 and 34% greater than NA, respectively. No amendment reduced Rs by an average of 12% compared to amendment treatments. Enhanced grain yield with soil amendment resulted in increased carbon emission efficiency (CEE) with SC &gt; MS &gt; CF &gt; SM &gt; NA. Across years, SC decreased soil bulk density by 13% and increased CEE, soil total C, and soil hydraulic conductivity by 52, 19, and 21%, respectively, compared to NA. These results demonstrate the viability of swine manure + chemical fertilizer at 200 kg N ha<sup>&#8722;1</sup> as a soil amendment for improved CEE and advancing sustainable maize production in semi-arid rainfed environments.