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Additional N application and ecotype affect yield and quality of ratoon harvested sorghum x sudangrass hybrid for temperate regions
Biomass & Bioenergy ( IF 6 ) Pub Date : 2022-04-05 , DOI: 10.1016/j.biombioe.2022.106423
Nayoung Choi , Gamgon Kim , Wonsang Park , Yonghyun Jeong , Yoon-ha Kim , Chae-In Na

Sorghum x sudangrass hybrid (Sorghum bicolor (L.) Moench) has excellent biomass yield and requires low maintenance. It can be harvested multiple times during the growing season. It has great potential to be used for cellulosic biofuel production in the temperate regions, including the Korean peninsula. However, N requirements during the regrowth have not been evaluated yet. Three years of the study with two ecotypes (early-flowering vs. late-flowering) were compared. After summer harvest, additional N (0, 50, 100, 150 kg N ha−1) were applied. Early-middle-late ratoon harvest treatments were executed to evaluate the ideal period for biomass yield and Theoretical Ethanol Yield (TEY). The late-flowering ecotype had greater biomass yield, TEY, and N-Agronomic Efficiency (NAE) due to longer vegetative growth. Maximum biomass yield was 7.44 Mg D.W. ha−1 (equivalent to TEY of 2657 L ha−1) at the additional 100 N kg ha−1 of middle ratoon harvest in 2018 when weather condition was unfavorable. However, with the favorable weather condition in 2019, additional 150 N kg ha−1 of late ratoon harvest outyielded (10.66 Mg ha−1; TEY of 4081 L ha−1). NAE was highest at 50 N kg ha−1 and then decreased with higher N rates. It indicates that additional N application is essential to achieve biomass yield and TEY under multiple harvest conditions. The appropriate harvest window for the ratooning crop was up to 14 weeks. Thus, additional N application and decision-making for harvest window are crucial factors affecting biomass yield and quality for biofuel with a choice of late-flowering ecotype.



中文翻译:

额外的施氮量和生态型影响温带地区宿根收获的高粱 x 苏丹草杂交种的产量和质量

Sorghum x sudangrass hybrid ( Sorghum bicolor (L.) Moench) 具有优异的生物量产量并且需要低维护。在生长季节可以多次收获。它在包括朝鲜半岛在内的温带地区用于纤维素生物燃料生产的潜力巨大。然而,尚未评估再生期间的 N 需求。对两种生态型(早开花与晚开花)的三年研究进行了比较。夏季收获后,额外的 N (0, 50, 100, 150 kg N ha -1) 被应用。进行早中晚宿根收获处理以评估生物量产量和理论乙醇产量(TEY)的理想时期。由于较长的营养生长,晚开花生态型具有更高的生物量产量、TEY 和 N-农艺效率 (NAE)。在 2018 年天气条件不利的情况下,在额外 100 N kg ha -1的中期再生树收获时,最大生物量产量为 7.44 Mg DW ha -1(相当于 2657 L ha -1的 TEY)。然而,在 2019 年有利的天气条件下,额外的 150 N kg ha -1后期再生树收获超过了产量(10.66 Mg ha -1;TEY 为 4081 L ha -1)。NAE 在 50 N kg ha -1时最高然后随着 N 率的增加而下降。这表明额外的 N 应用对于在多种收获条件下实现生物量产量和 TEY 是必不可少的。再生作物的适当收获窗口长达 14 周。因此,额外的氮应用和收获窗口的决策是影响生物燃料生物量产量和质量的关键因素,可选择晚开花生态型。

更新日期:2022-04-05
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