Ảnh hưởng của bã cà phê tươi lên sinh trưởng, năng suất một số cây trồng và đặc tính sinh học đất xám bạc màu từ huyện Mộc Hóa, tỉnh Long An trong điều kiện nhà lưới

Abstract

The study was to evaluate the affect of fresh spent coffee ground (FSCG) on growth and yields of maize, soybean and rice and as well soil microbial properties under the greenhouse conditions. Maize, soybean and rice were rotationally cultivated in the same soil type (grey degraded soil) from Moc Hoa, Long An with 4 replicates and 7 different treatments including the control (no fertilization) and five levels (2, 4, 6, 8 and 10%) of FSCG applied (w/w, based on the soil mass) and the treatment with recommended inorganic NPK fertilizer application. Height of plant, numbers of leaf, tillers of rice, numbers of bacteria and fungi in soil were sampled at day 30, 45 (60), 60 (90) after seedling. Yield of crops and the structure of bacterial community in soil at the end of the study were also collected. The results showed that applying FSCG at doses of 6 and 10% enhanced the growth and yields of soybean and rice, but no maize as compared to the recommended inorganic NPK fertilizer application treatment, increased signicifcantly the numbers of soil bacteria, fungi, nitrogen fixing bacteria and phosphate solubilizing bacteria as compared to other treatments, especially at the end of maize season and during the whole soybean season. Moreover, the structure of soil bacterial community in these two treatments was more diversified than others. Thus, based on the present study it is recommended that fresh SCG can be applied with a dose of 6% or 10% into soil as a soil clean amender to improve soil fertility and crop yield for sustainably agricultural development.