Search

The goal of this study was to enhance the utilization of millet straw and reduce N 2 O emissions, used the semi-interpenetrating (Semi-IPN) technology to develop a novel straw-based material (CSC-g-PAA/PPVA) through the composite integration of modified straw and linear polymer (PPVA). The fourier-transform infrared, x-ray diffraction, x-photoelectron spectroscopy and scanning electron microscopy techniques were be measured to provide evidence of the structure and morphology characterization of CSC-g-PAA/PPVA. The results demonstrated that it exhibited excellent water absorbency and enhanced the adsorption capacity of inorganic nitrogen, with the maximum adsorption of NH 4 + and NO 3 - were 94.5 mg/g and 70.3 mg/g, respectively. The properties of CSC-g-PAA/PPVA could significantly reduce N 2 O emissions, which was 42.5–95.7% lower than that of the fertilization groups, demonstrated that the modified material produced in this study had significant potential to reduce greenhouse gas emissions. [Display omitted] • The soil conditioner is derived from corn straw, which can enhance waste straw utilization. • The product is rich in typical functional group, providing active sites for NH 4 +, NO 3 - retention. • The straw-based conditioner has significant potential to reduce N 2 O emissions in soil. • Preparing by waste straw can reduce cost, is beneficial to industrial production. [ABSTRACT FROM AUTHOR]

The goal of this study was to enhance the utilization of millet straw and endow it with the fertilizer function through modifying the carboxymethylcellulose (CMC-NH 4), based on wheat straw, by acidification and ammonification to improve water and fertilizer efficiency. Amine group was introduced through the electrophilic substitution to supply nutrients to crops. The order of influential factors on the water absorption property was determined by an orthogonal experiment and showed that the highest water absorbency of 224.7 g/g, which was achieved for the conditions of 3:1 carboxymethylcellulose to nitric acid solution (mass percentage concentration of 50%), 3:1 carboxymethylcellulose to ammonia solution with the mass percentage concentration is 30%. The CMC-NH 4 was characterized by scanning electron microscopy, fourier-transform infrared, x-ray diffraction, and X-ray photoelectron spectroscopy techniques, and the results indicated that application of CMC-NH 4 promoted the growth indexes of wheat, improved wheat yields. Therefore, the waste straw was modified into the soil conditioner with specific function by the group targeted modification strategy. In addition, the fertilizer efficiency and water-retention behavior of CMC-NH 4 encouraged its use as a safe water- and fertilizer-retaining agent in agricultural applications. [Display omitted] • The product prepared by straw can reduces cost, is easy for agricultural extension. • The CMC-NH 4 is rich in ammonium, could provide fertilizer for crop growth. • The product shows excellent water retention and could prevent water percolation. [ABSTRACT FROM AUTHOR]