Bài báo khoa học

This study was conducted to evaluate the effect of organic fertilizers combining with inorganic fertilizers on the yield of maize and coastal sandy soil quality in Nghi Loc district, Nghe An province. The experiment was arranged in full randomized block with 3 replicates. The experiment includes 7 formulas: CT1 (100% inorganic fertilizers N, P, K- control); CT2 (replacing 10% of inorganic N with N in organic fertilizer + remaining inorganic N, P, and K content ); CT3 (replacing 20% of inorganic N with N in organic fertilizers + remaining inorganic N, P, and K); CT4 (replacing 30% of inorganic N with N in organic fertilizers + remaining inorganic N, P, and K); CT5 (100% N, P, K inorganic + 10% N from organic fertilizers); CT6 (100% N, P, K inorganic + 20% N from organic fertilizers); CT7 (100% N, P, K inorganic + 30% N from organic fertilizers). The experimental results showed that combination of organic and inorganic fertilizers in maize cultivars affected agronomical parameters and chemical qualities of sandy soil in both study sites in Nghi Thach and Nghi Thai communes. The amount of 100% N, P, K inorganic + 30% N from organic fertilizers (formula 7) has given maize yield and soil chemical qualities higher than the other formulas at the statistical significance level (p <0.05). When comparing the economic efficiency, it showed that the amount of formula 7 also brings the highest profit, about 1 million VND/ha higher than amount 100% N, P, K inorganic + 20% N from organic fertilizers (formula 6).