ABSTRACT

Small-scale farmers still rely mostly on chemical fertilizers (CF) for crop production. Recently, CF have become expensive and could in some way have a negative impact on soil quality after long-term application. However, co-application of biogas slurry (BGS) with CF could help reduce farming costs while improving crop production and soil health. The study was a field experiment conducted in 2016–2017 and 2017–2018 growing seasons and arranged in a randomized complete block design with four replicates. The treatments were based on percentages of recommended Nitrogen (N) rates of 120 kg N ha⁻¹ for maize production. The BGS/CF treatments were (i) 0/0, (ii) 0/120, (iii) 24/96, (iv) 48/72, (v) 72/48, (vi) 96/24, (vii) 120/0 kg N ha⁻¹. BGS/CF (48/72) treatment resulted into higher dry matter yield in 2016–2017, which was higher than all other treatment combinations, while in the 2017–2018 season, treatment of (0/120) resulted into higher dry matter than all other treatment combinations. The (48/72) and (0/120) treatments resulted into similar grain yield in 2016–2017 season. (48/72), (72/48), and (120/0) treatments had higher N, P, K, Ca, and Mg uptake than (0/0), (0/120), 26 (24/96), and (96/24) treatments in both seasons. Soil pH, total N, K, and Mg were high from (120/0) than all other treatments in 2016–2017 while in the 2017–2018, (48/72), had higher OC, P, and K after maize harvest. The findings of this study show that co-application of BGS/CF at 48/72 and 72/48 have maize yield benefits compared to the two resources, BGS/CF (120/0) and BGS/CF (0/120), applied separately in soil.

摘要

小农仍然主要依靠化学肥料 (CF) 进行作物生产。最近，CF 变得昂贵，并且在长期施用后可能以某种方式对土壤质量产生负面影响。然而，沼液 (BGS) 与 CF 的共同应用有助于降低耕作成本，同时改善作物产量和土壤健康。该研究是在 2016-2017 年和 2017-2018 年生长季节进行的田间试验，采用随机完整区组设计，有四个重复。处理基于用于玉米生产的推荐氮 (N) 比率 120 kg N ha ^{-1的百分比。}BGS/CF 处理为 (i) 0/0, (ii) 0/120, (iii) 24/96, (iv) 48/72, (v) 72/48, (vi) 96/24, (vii) ) 120/0 kg N ha ^-1. BGS/CF (48/72) 处理导致 2016-2017 年干物质产量较高，高于所有其他处理组合，而在 2017-2018 季节，(0/120) 处理导致干物质产量高于所有其他处理组合所有其他治疗组合。(48/72) 和 (0/120) 处理导致 2016-2017 季节的谷物产量相似。(48/72)、(72/48) 和 (120/0) 处理的 N、P、K、Ca 和 Mg 吸收高于 (0/0)、(0/120)、26 (24/96) ) 和 (96/24) 两个季节的处理。2016-2017 年土壤 pH 值、总 N、K 和 Mg 从（120/0）高于所有其他处理，而在 2017-2018 年（48/72）玉米收获后具有更高的 OC、P 和 K . 本研究结果表明，与两种资源 BGS/CF (120/0) 和 BGS/CF (0/120) 相比，在 48/72 和 72/48 共同施用 BGS/CF 具有玉米产量效益，